流程返回值改为FlowResult，记录节点信息、上下文信息，为以后的流程调用回溯做准备

Library/Utils/ConvertHelper.cs

@@ -14,6 +14,109 @@ namespace Serein.Library.Utils
     /// </summary>
     public static class ConvertHelper
     {
+        /// <summary>
+        /// 字面量转为对应类型
+        /// </summary>
+        /// <param name="valueStr"></param>
+        /// <returns></returns>
+        public static Type ToTypeOfString(this string valueStr)
+        {
+            if (valueStr.IndexOf('.') != -1)
+            {
+                // 通过指定的类型名称获取类型
+                return Type.GetType(valueStr);
+            }
+
+
+            if (valueStr.Equals("bool", StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(bool);
+            }
+            #region 整数型
+            else if (valueStr.Equals("sbyte", StringComparison.OrdinalIgnoreCase)
+                    || valueStr.Equals(nameof(SByte), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(SByte);
+            }
+            else if (valueStr.Equals("short", StringComparison.OrdinalIgnoreCase)
+                || valueStr.Equals(nameof(Int16), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(Int16);
+            }
+            else if (valueStr.Equals("int", StringComparison.OrdinalIgnoreCase)
+                || valueStr.Equals(nameof(Int32), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(Int32);
+            }
+            else if (valueStr.Equals("long", StringComparison.OrdinalIgnoreCase)
+                || valueStr.Equals(nameof(Int64), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(Int64);
+            }
+
+            else if (valueStr.Equals("byte", StringComparison.OrdinalIgnoreCase)
+                || valueStr.Equals(nameof(Byte), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(Byte);
+            }
+            else if (valueStr.Equals("ushort", StringComparison.OrdinalIgnoreCase)
+                || valueStr.Equals(nameof(UInt16), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(UInt16);
+            }
+            else if (valueStr.Equals("uint", StringComparison.OrdinalIgnoreCase)
+                || valueStr.Equals(nameof(UInt32), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(UInt32);
+            }
+            else if (valueStr.Equals("ulong", StringComparison.OrdinalIgnoreCase)
+                || valueStr.Equals(nameof(UInt64), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(UInt64);
+            }
+            #endregion
+
+            #region 浮点型
+            else if (valueStr.Equals("float", StringComparison.OrdinalIgnoreCase)
+                        || valueStr.Equals(nameof(Single), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(Single);
+            }
+            else if (valueStr.Equals("double", StringComparison.OrdinalIgnoreCase)
+                || valueStr.Equals(nameof(Double), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(Double);
+            }
+            #endregion
+
+            #region 小数型
+
+            else if (valueStr.Equals("decimal", StringComparison.OrdinalIgnoreCase)
+                    || valueStr.Equals(nameof(Decimal), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(Decimal);
+            }
+            #endregion
+
+            #region 其他常见的类型
+            else if (valueStr.Equals(nameof(DateTime), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(DateTime);
+            }
+
+            else if (valueStr.Equals(nameof(String), StringComparison.OrdinalIgnoreCase))
+            {
+                return typeof(String);
+            }
+            #endregion
+
+            else
+            {
+                throw new ArgumentException($"无法解析的字面量类型[{valueStr}]");
+            }
+        }
+
+
 
         /// <summary>
         /// 对象转JSON文本