mirror of
https://gitee.com/langsisi_admin/serein-flow
synced 2026-03-02 15:50:47 +08:00
684 lines
24 KiB
C#
684 lines
24 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reactive;
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using System.Reflection;
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using System.Reflection.Emit;
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using System.Text;
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using System.Threading.Tasks;
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namespace Serein.Library.Utils
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{
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/// <summary>
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/// Emit创建委托工具类
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/// </summary>
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public class EmitHelper
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{
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/// <summary>
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/// 动态方法信息
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/// </summary>
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public class EmitMethodInfo
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{
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/// <summary>
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/// 方法声明类型
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/// </summary>
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public Type DeclaringType { get; set; }
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/// <summary>
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/// 方法类型
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/// </summary>
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public EmitMethodType EmitMethodType { get; set; }
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/// <summary>
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/// 是异步方法
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/// </summary>
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public bool IsAsync { get; set; }
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/// <summary>
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/// 是静态的
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/// </summary>
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public bool IsStatic { get; set; }
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public bool HasByRefParameters { get; set; }
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public int[] ByRefParameterIndexes { get; set; } = [];
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}
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/// <summary>
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/// 方法类型枚举
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/// </summary>
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public enum EmitMethodType
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{
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/// <summary>
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/// 普通的方法。如果方法返回void时，将会返回null。
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/// </summary>
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Func,
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/// <summary>
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/// 无返回值的异步方法
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/// </summary>
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Task,
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/// <summary>
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/// 有返回值的异步方法
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/// </summary>
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TaskHasResult,
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}
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/// <summary>
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/// 判断一个类型是否为泛型 Task<T> 或 Task，并返回泛型参数类型（如果有的话）
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/// </summary>
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/// <param name="returnType"></param>
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/// <param name="taskResult"></param>
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/// <returns></returns>
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#nullable enable
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public static bool IsGenericTask(Type returnType, out Type? taskResult)
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{
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// 判断是否为 Task 类型或泛型 Task<T>
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if (returnType == typeof(Task))
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{
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taskResult = typeof(void);
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return true;
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}
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else if (returnType.IsGenericType && returnType.GetGenericTypeDefinition() == typeof(Task<>))
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{
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// 获取泛型参数类型
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Type genericArgument = returnType.GetGenericArguments()[0];
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taskResult = genericArgument;
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return true;
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}
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else
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{
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taskResult = null;
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return false;
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}
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}
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/// <summary>
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/// 根据方法信息创建动态调用的委托，返回方法类型，以及传出一个委托
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/// </summary>
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/// <param name="methodInfo"></param>
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/// <param name="delegate"></param>
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/// <returns></returns>
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/// <summary>
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/// 根据方法信息创建动态调用的委托，返回方法类型，以及传出一个委托
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/// </summary>
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/// <param name="methodInfo"></param>
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/// <param name="delegate"></param>
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/// <returns></returns>
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public static EmitMethodInfo CreateMethod(MethodInfo methodInfo, out Delegate @delegate)
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{
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if (methodInfo.DeclaringType == null)
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throw new ArgumentNullException(nameof(methodInfo.DeclaringType));
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bool isStatic = methodInfo.IsStatic;
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bool isTask = IsGenericTask(methodInfo.ReturnType, out var taskResultType);
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bool isTaskGeneric = taskResultType != null;
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Type dynamicReturnType;
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if (!isTask)
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dynamicReturnType = typeof(object);
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else
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dynamicReturnType = isTaskGeneric ? typeof(Task<object>) : typeof(Task);
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var dynamicMethod = new DynamicMethod(
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methodInfo.Name + "_Emit",
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dynamicReturnType,
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new[] { typeof(object), typeof(object[]) },
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restrictedSkipVisibility: true);
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ILGenerator il = dynamicMethod.GetILGenerator();
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var parameters = methodInfo.GetParameters();
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// ==============================
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// 1. 声明 ref / out / in 局部变量
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// ==============================
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LocalBuilder?[] locals = new LocalBuilder?[parameters.Length];
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List<int> byRefIndexes = new();
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for (int i = 0; i < parameters.Length; i++)
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{
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if (parameters[i].ParameterType.IsByRef)
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{
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var elementType = parameters[i].ParameterType.GetElementType()!;
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locals[i] = il.DeclareLocal(elementType);
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byRefIndexes.Add(i);
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}
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}
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// ==============================
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// 2. 初始化 ref / in 参数
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// ==============================
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for (int i = 0; i < parameters.Length; i++)
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{
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var p = parameters[i];
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if (!p.ParameterType.IsByRef || p.IsOut)
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continue;
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il.Emit(OpCodes.Ldarg_1);
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il.Emit(OpCodes.Ldc_I4, i);
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il.Emit(OpCodes.Ldelem_Ref);
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var elementType = p.ParameterType.GetElementType()!;
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if (elementType.IsValueType)
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il.Emit(OpCodes.Unbox_Any, elementType);
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else
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il.Emit(OpCodes.Castclass, elementType);
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il.Emit(OpCodes.Stloc, locals[i]!);
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}
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// ==============================
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// 3. 加载实例
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// ==============================
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if (!isStatic)
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{
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il.Emit(OpCodes.Ldarg_0);
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il.Emit(OpCodes.Castclass, methodInfo.DeclaringType);
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}
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// ==============================
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// 4. 加载参数
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// ==============================
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for (int i = 0; i < parameters.Length; i++)
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{
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var p = parameters[i];
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if (p.ParameterType.IsByRef)
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{
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il.Emit(OpCodes.Ldloca, locals[i]!);
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}
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else
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{
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il.Emit(OpCodes.Ldarg_1);
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il.Emit(OpCodes.Ldc_I4, i);
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il.Emit(OpCodes.Ldelem_Ref);
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if (p.ParameterType.IsValueType)
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il.Emit(OpCodes.Unbox_Any, p.ParameterType);
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else
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il.Emit(OpCodes.Castclass, p.ParameterType);
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}
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}
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// ==============================
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// 5. 调用方法
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// ==============================
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il.Emit(isStatic ? OpCodes.Call : OpCodes.Callvirt, methodInfo);
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// ==============================
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// 6. 回写 ref / out 参数
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// ==============================
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for (int i = 0; i < parameters.Length; i++)
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{
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if (!parameters[i].ParameterType.IsByRef)
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continue;
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var elementType = parameters[i].ParameterType.GetElementType()!;
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il.Emit(OpCodes.Ldarg_1);
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il.Emit(OpCodes.Ldc_I4, i);
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il.Emit(OpCodes.Ldloc, locals[i]!);
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if (elementType.IsValueType)
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il.Emit(OpCodes.Box, elementType);
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il.Emit(OpCodes.Stelem_Ref);
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}
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// ==============================
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// 7. 处理返回值
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// ==============================
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if (methodInfo.ReturnType == typeof(void))
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{
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il.Emit(OpCodes.Ldnull);
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}
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else if (!isTask && methodInfo.ReturnType.IsValueType)
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{
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il.Emit(OpCodes.Box, methodInfo.ReturnType);
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}
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il.Emit(OpCodes.Ret);
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// ==============================
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// 8. 创建委托
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// ==============================
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EmitMethodType emitType;
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if (!isTask)
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{
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emitType = EmitMethodType.Func;
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@delegate = dynamicMethod.CreateDelegate(
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typeof(Func<object, object[], object>));
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}
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else if (isTaskGeneric)
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{
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emitType = EmitMethodType.TaskHasResult;
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@delegate = dynamicMethod.CreateDelegate(
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typeof(Func<object, object[], Task<object>>));
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}
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else
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{
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emitType = EmitMethodType.Task;
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@delegate = dynamicMethod.CreateDelegate(
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typeof(Func<object, object[], Task>));
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}
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return new EmitMethodInfo
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{
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EmitMethodType = emitType,
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DeclaringType = methodInfo.DeclaringType,
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IsAsync = isTask,
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IsStatic = isStatic,
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HasByRefParameters = byRefIndexes.Count > 0,
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ByRefParameterIndexes = byRefIndexes.ToArray()
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};
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}
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/// <summary>
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/// 构建字段 Getter 委托：Func<object, object>
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/// </summary>
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public static Func<object, object> CreateFieldGetter(FieldInfo fieldInfo)
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{
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if (fieldInfo == null)
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throw new ArgumentNullException(nameof(fieldInfo));
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if (fieldInfo.DeclaringType == null)
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throw new ArgumentNullException(nameof(fieldInfo.DeclaringType));
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var method = new DynamicMethod(
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fieldInfo.Name + "_Get",
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typeof(object),
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new[] { typeof(object) },
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fieldInfo.DeclaringType,
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true);
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ILGenerator il = method.GetILGenerator();
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if (!fieldInfo.IsStatic)
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{
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// 加载实例
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il.Emit(OpCodes.Ldarg_0);
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il.Emit(OpCodes.Castclass, fieldInfo.DeclaringType);
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il.Emit(OpCodes.Ldfld, fieldInfo);
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}
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else
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{
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il.Emit(OpCodes.Ldsfld, fieldInfo);
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}
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// 如果是值类型，装箱
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if (fieldInfo.FieldType.IsValueType)
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il.Emit(OpCodes.Box, fieldInfo.FieldType);
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il.Emit(OpCodes.Ret);
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return (Func<object, object>)method.CreateDelegate(typeof(Func<object, object>));
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}
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/// <summary>
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/// 构建字段 Setter 委托：Action<object, object>
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/// </summary>
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public static Action<object, object> CreateFieldSetter(FieldInfo fieldInfo)
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{
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if (fieldInfo == null)
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throw new ArgumentNullException(nameof(fieldInfo));
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if (fieldInfo.DeclaringType == null)
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throw new ArgumentNullException(nameof(fieldInfo.DeclaringType));
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if (fieldInfo.IsInitOnly)
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throw new InvalidOperationException($"字段 {fieldInfo.Name} 是只读字段，无法设置值。");
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var method = new DynamicMethod(
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fieldInfo.Name + "_Set",
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null,
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new[] { typeof(object), typeof(object) },
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fieldInfo.DeclaringType,
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true);
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ILGenerator il = method.GetILGenerator();
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if (!fieldInfo.IsStatic)
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{
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il.Emit(OpCodes.Ldarg_0);
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il.Emit(OpCodes.Castclass, fieldInfo.DeclaringType);
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}
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// 加载值
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il.Emit(OpCodes.Ldarg_1);
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if (fieldInfo.FieldType.IsValueType)
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il.Emit(OpCodes.Unbox_Any, fieldInfo.FieldType);
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else
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il.Emit(OpCodes.Castclass, fieldInfo.FieldType);
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if (fieldInfo.IsStatic)
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il.Emit(OpCodes.Stsfld, fieldInfo);
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else
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il.Emit(OpCodes.Stfld, fieldInfo);
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il.Emit(OpCodes.Ret);
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return (Action<object, object>)method.CreateDelegate(typeof(Action<object, object>));
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}
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/// <summary>
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/// 构建属性 Getter 委托：Func<object, object>
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/// </summary>
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public static Func<object, object> CreatePropertyGetter(PropertyInfo propertyInfo)
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{
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if (propertyInfo == null)
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throw new ArgumentNullException(nameof(propertyInfo));
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if (propertyInfo.DeclaringType == null)
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throw new ArgumentNullException(nameof(propertyInfo.DeclaringType));
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var getMethod = propertyInfo.GetGetMethod(true);
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if (getMethod == null)
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throw new InvalidOperationException($"属性 {propertyInfo.Name} 没有可用的 Getter。");
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var method = new DynamicMethod(
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propertyInfo.Name + "_Get",
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typeof(object),
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new[] { typeof(object) },
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propertyInfo.DeclaringType,
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true);
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ILGenerator il = method.GetILGenerator();
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if (!getMethod.IsStatic)
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{
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il.Emit(OpCodes.Ldarg_0);
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il.Emit(OpCodes.Castclass, propertyInfo.DeclaringType);
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il.EmitCall(OpCodes.Callvirt, getMethod, null);
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}
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else
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{
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il.EmitCall(OpCodes.Call, getMethod, null);
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}
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// 装箱
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if (propertyInfo.PropertyType.IsValueType)
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il.Emit(OpCodes.Box, propertyInfo.PropertyType);
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il.Emit(OpCodes.Ret);
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return (Func<object, object>)method.CreateDelegate(typeof(Func<object, object>));
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}
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/// <summary>
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/// 构建属性 Setter 委托：Action<object, object>
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/// </summary>
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public static Action<object, object> CreatePropertySetter(PropertyInfo propertyInfo)
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{
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if (propertyInfo == null)
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throw new ArgumentNullException(nameof(propertyInfo));
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if (propertyInfo.DeclaringType == null)
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throw new ArgumentNullException(nameof(propertyInfo.DeclaringType));
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var setMethod = propertyInfo.GetSetMethod(true);
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if (setMethod == null)
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throw new InvalidOperationException($"属性 {propertyInfo.Name} 没有可用的 Setter。");
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var method = new DynamicMethod(
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propertyInfo.Name + "_Set",
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null,
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new[] { typeof(object), typeof(object) },
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propertyInfo.DeclaringType,
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true);
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ILGenerator il = method.GetILGenerator();
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if (!setMethod.IsStatic)
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{
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il.Emit(OpCodes.Ldarg_0);
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il.Emit(OpCodes.Castclass, propertyInfo.DeclaringType);
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}
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// 加载值
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il.Emit(OpCodes.Ldarg_1);
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if (propertyInfo.PropertyType.IsValueType)
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il.Emit(OpCodes.Unbox_Any, propertyInfo.PropertyType);
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else
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il.Emit(OpCodes.Castclass, propertyInfo.PropertyType);
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if (setMethod.IsStatic)
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il.EmitCall(OpCodes.Call, setMethod, null);
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else
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il.EmitCall(OpCodes.Callvirt, setMethod, null);
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il.Emit(OpCodes.Ret);
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return (Action<object, object>)method.CreateDelegate(typeof(Action<object, object>));
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}
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/// <summary>
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/// 构建数组创建委托：Func<int, object[]>
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/// </summary>
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/// <param name="elementType"></param>
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/// <returns></returns>
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/// <exception cref="ArgumentNullException"></exception>
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public static Func<int, object> CreateArrayFactory(Type elementType)
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{
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if (elementType == null) throw new ArgumentNullException(nameof(elementType));
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var arrayType = elementType.MakeArrayType();
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var dm = new DynamicMethod(
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$"NewArray_{elementType.Name}",
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typeof(object), // 返回 object
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new[] { typeof(int) }, // 参数：length
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typeof(EmitHelper).Module,
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true);
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var il = dm.GetILGenerator();
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il.Emit(OpCodes.Ldarg_0); // length
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il.Emit(OpCodes.Newarr, elementType); // new T[length]
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il.Emit(OpCodes.Ret); // 返回 T[]
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return (Func<int, object>)dm.CreateDelegate(typeof(Func<int, object>));
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}
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/// <summary>
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/// 构建集合赋值委托：Action<object, object, object>
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/// </summary>
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/// <param name="collectionType"></param>
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/// <returns></returns>
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/// <exception cref="NotSupportedException"></exception>
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public static Action<object, object, object> CreateCollectionSetter(Type collectionType)
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{
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DynamicMethod dm = new DynamicMethod(
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"SetCollectionValue",
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null,
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new[] { typeof(object), typeof(object), typeof(object) },
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typeof(EmitHelper).Module,
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true);
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ILGenerator il = dm.GetILGenerator();
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if (collectionType.IsArray)
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{
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// (object array, object index, object value) => ((T[])array)[(int)index] = (T)value;
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var elementType = collectionType.GetElementType()!;
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il.Emit(OpCodes.Ldarg_0);
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il.Emit(OpCodes.Castclass, collectionType); // 转为真实数组类型
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il.Emit(OpCodes.Ldarg_1);
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il.Emit(OpCodes.Unbox_Any, typeof(int)); // index
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il.Emit(OpCodes.Ldarg_2);
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if (elementType.IsValueType)
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il.Emit(OpCodes.Unbox_Any, elementType);
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else
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il.Emit(OpCodes.Castclass, elementType);
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il.Emit(OpCodes.Stelem, elementType); // 设置数组元素
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il.Emit(OpCodes.Ret);
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}
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else
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{
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// 尝试获取 set_Item 方法
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MethodInfo? setItem = collectionType.GetMethod("set_Item", BindingFlags.Instance | BindingFlags.Public);
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if (setItem == null)
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throw new NotSupportedException($"类型 {collectionType} 不支持 set_Item。");
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var parameters = setItem.GetParameters();
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var indexType = parameters[0].ParameterType;
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var valueType = parameters[1].ParameterType;
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// (object collection, object index, object value) => ((CollectionType)collection)[(IndexType)index] = (ValueType)value;
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il.Emit(OpCodes.Ldarg_0);
|
||
il.Emit(OpCodes.Castclass, collectionType);
|
||
|
||
il.Emit(OpCodes.Ldarg_1);
|
||
if (indexType.IsValueType)
|
||
il.Emit(OpCodes.Unbox_Any, indexType);
|
||
else
|
||
il.Emit(OpCodes.Castclass, indexType);
|
||
|
||
il.Emit(OpCodes.Ldarg_2);
|
||
if (valueType.IsValueType)
|
||
il.Emit(OpCodes.Unbox_Any, valueType);
|
||
else
|
||
il.Emit(OpCodes.Castclass, valueType);
|
||
|
||
il.Emit(OpCodes.Callvirt, setItem);
|
||
il.Emit(OpCodes.Ret);
|
||
}
|
||
|
||
return (Action<object, object, object>)dm.CreateDelegate(typeof(Action<object, object, object>));
|
||
}
|
||
|
||
|
||
/// <summary>
|
||
/// 构建集合取值委托：(object collection, object index) => object value
|
||
/// 支持数组、泛型集合、IDictionary 等类型
|
||
/// </summary>
|
||
public static Func<object, object, object> CreateCollectionGetter(Type collectionType, Type? itemType = null)
|
||
{
|
||
DynamicMethod dm = new DynamicMethod(
|
||
"GetCollectionValue",
|
||
typeof(object),
|
||
new[] { typeof(object), typeof(object) },
|
||
typeof(EmitHelper).Module,
|
||
skipVisibility: true);
|
||
|
||
ILGenerator il = dm.GetILGenerator();
|
||
|
||
// 数组类型处理
|
||
if (collectionType.IsArray)
|
||
{
|
||
var elementType = collectionType.GetElementType()!;
|
||
il.Emit(OpCodes.Ldarg_0);
|
||
il.Emit(OpCodes.Castclass, collectionType); // 转为真实数组类型
|
||
il.Emit(OpCodes.Ldarg_1);
|
||
il.Emit(OpCodes.Unbox_Any, typeof(int)); // 转为int索引
|
||
il.Emit(OpCodes.Ldelem, elementType); // 取值
|
||
if (elementType.IsValueType)
|
||
il.Emit(OpCodes.Box, elementType); // 装箱
|
||
il.Emit(OpCodes.Ret);
|
||
}
|
||
// 非泛型 IDictionary 类型（如 Hashtable、JObject）
|
||
else if (IsGenericDictionaryType(collectionType, out var keyType, out var valueType))
|
||
{
|
||
var getItem = collectionType.GetMethod("get_Item", new[] { keyType });
|
||
if (getItem == null)
|
||
throw new NotSupportedException($"{collectionType} 未实现 get_Item({keyType})");
|
||
|
||
var returnType = getItem.ReturnType;
|
||
|
||
il.Emit(OpCodes.Ldarg_0);
|
||
il.Emit(OpCodes.Castclass, collectionType);
|
||
|
||
il.Emit(OpCodes.Ldarg_1);
|
||
if (keyType.IsValueType)
|
||
il.Emit(OpCodes.Unbox_Any, keyType);
|
||
else
|
||
il.Emit(OpCodes.Castclass, keyType);
|
||
|
||
il.Emit(OpCodes.Callvirt, getItem);
|
||
|
||
if (returnType.IsValueType)
|
||
il.Emit(OpCodes.Box, returnType);
|
||
|
||
il.Emit(OpCodes.Ret);
|
||
}
|
||
|
||
// 实现 get_Item 方法的类型（如 List<T>, Dictionary<TKey, TValue> 等）
|
||
else
|
||
{
|
||
/*var methodInfos = collectionType.GetMethods(BindingFlags.Instance | BindingFlags.Public);
|
||
MethodInfo? getItem;
|
||
|
||
if (methodInfos.Length > 1)
|
||
{
|
||
getItem = methodInfos.Where(m => m.Name.Equals("get_Item")).Where(m =>
|
||
{
|
||
var ps = m.GetParameters().ToArray();
|
||
if (ps.Length > 1) return false;
|
||
if (ps[0].ParameterType == typeof(object)) return false;
|
||
return true;
|
||
}).FirstOrDefault();
|
||
}
|
||
else
|
||
{
|
||
//getItem = collectionType.GetMethod("get_Item", BindingFlags.Instance | BindingFlags.Public);
|
||
getItem = methodInfos.First(m => m.Name.Equals("get_Item"));
|
||
}
|
||
*/
|
||
// GetMethod(name, bindingAttr, binder: null, types, modifiers: null);
|
||
MethodInfo? getItem = collectionType.GetMethod("get_Item", bindingAttr: BindingFlags.Instance | BindingFlags.Public, binder: null, types: [itemType], modifiers: null);
|
||
if (getItem == null)
|
||
throw new NotSupportedException($"类型 {collectionType} 不支持 get_Item。");
|
||
|
||
var indexParamType = getItem.GetParameters()[0].ParameterType;
|
||
var returnType = getItem.ReturnType;
|
||
|
||
il.Emit(OpCodes.Ldarg_0);
|
||
il.Emit(OpCodes.Castclass, collectionType);
|
||
il.Emit(OpCodes.Ldarg_1);
|
||
|
||
if (indexParamType.IsValueType)
|
||
il.Emit(OpCodes.Unbox_Any, indexParamType);
|
||
else
|
||
il.Emit(OpCodes.Castclass, indexParamType);
|
||
|
||
il.Emit(OpCodes.Callvirt, getItem);
|
||
|
||
if (returnType.IsValueType)
|
||
il.Emit(OpCodes.Box, returnType);
|
||
|
||
il.Emit(OpCodes.Ret);
|
||
}
|
||
|
||
return (Func<object, object, object>)dm.CreateDelegate(typeof(Func<object, object, object>));
|
||
}
|
||
|
||
|
||
|
||
private static bool IsGenericDictionaryType(Type type, out Type keyType, out Type valueType)
|
||
{
|
||
keyType = null!;
|
||
valueType = null!;
|
||
|
||
var dictInterface = type
|
||
.GetInterfaces()
|
||
.FirstOrDefault(t =>
|
||
t.IsGenericType &&
|
||
t.GetGenericTypeDefinition() == typeof(IDictionary<,>));
|
||
|
||
if (dictInterface != null)
|
||
{
|
||
var args = dictInterface.GetGenericArguments();
|
||
keyType = args[0];
|
||
valueType = args[1];
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
