wpf-visual-process-framework/VisionFrame.Base/Converter/NodeJsonConverter.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading.Tasks;

namespace VisionFrame.Base.Converter
{
    public class NodeJsonConverter : JsonConverter<NodeModelBase>
    {
        class TypeInfoTemp
        {
            public string TypeInfo { get; set; }
        }
        // 字符串到对象实例的转换过程
        public override NodeModelBase? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            string json = reader.GetString();// 包含程序信息

            TypeInfoTemp ti = System.Text.Json.JsonSerializer.Deserialize<TypeInfoTemp>(json);
            string[] type_info = ti.TypeInfo.Split(";");
            Assembly assembly = Assembly.GetEntryAssembly();// 取当前执行的程序集
            if (assembly.GetName().Name != type_info[0])
            {
                assembly = Assembly.LoadFile(Environment.CurrentDirectory + "/Activities/" + type_info[0] + ".dll");
            }
            // 最终要执的节点Model
            Type type = assembly.GetType(type_info[1]);

            NodeModelBase node = (NodeModelBase)System.Text.Json.JsonSerializer.Deserialize(json, type);
            return node;
        }

        // 对象到Json字符串的转换过程
        public override void Write(Utf8JsonWriter writer, NodeModelBase value, JsonSerializerOptions options)
        {
            // value--->Json
            // writer--写
            // 准备类型的记录
            string type = value.GetType().FullName;
            string assembly = value.GetType().Assembly.GetName().Name;
            value.TypeInfo = assembly + ";" + type;

            // 如果直接放value  会循环触发这个方法
            // 用一个动态变量接收，
            dynamic temp = value;
            string json = System.Text.Json.JsonSerializer.Serialize(temp);
            writer.WriteStringValue(json);
        }
    }
}