JSON反序列化到实体
应朋友要求写了一个反序列化JSON的东东
因为系统自带Json转换方法的无法将""转换DateTime?
初略写了一下 有任何问题或者建议 请留言。
using System; using System.Reflection.Emit; using System.Reflection; public class JSONSerialize<T> { public JSONSerialize() { } private delegate T Delegate(string json); private static Delegate handler; public static T DeSerialize(string json) { DynamicMethod method = new DynamicMethod("DynamicDeSerialize", typeof(T), new Type[] { typeof(string) }, typeof(T), true); ILGenerator generator = method.GetILGenerator(); LocalBuilder result = generator.DeclareLocal(typeof(T)); generator.Emit(OpCodes.Newobj, typeof(T).GetConstructor(Type.EmptyTypes)); generator.Emit(OpCodes.Stloc, result); json = json.Substring(1, json.Length - 2); string[] str = json.Split(new string[] { "\",\"" }, StringSplitOptions.RemoveEmptyEntries); foreach (string item in str) { string[] strpro = item.Split(new string[] { "\":\"" }, StringSplitOptions.None); string name = strpro[0].Replace("\"", ""); string value = strpro[1].Replace("\"", ""); PropertyInfo propertyInfo = typeof(T).GetProperty(name); LocalBuilder temp = generator.DeclareLocal(propertyInfo.PropertyType); Type t = typeof(Decimal);; MethodInfo dateParse= typeof(Decimal).GetMethod("Parse", new Type[] { typeof(string) }); if (propertyInfo.PropertyType == typeof(Nullable<Int32>)) { t = typeof(Int32); dateParse = t.GetMethod("Parse", new Type[] { typeof(string) }); } else if (propertyInfo.PropertyType == typeof(Nullable<DateTime>)) { t = typeof(DateTime); dateParse = t.GetMethod("Parse", new Type[] { typeof(string) }); } if (propertyInfo != null && propertyInfo.GetSetMethod() != null) { generator.Emit(OpCodes.Ldloc, result); if (propertyInfo.PropertyType==typeof(String)) { generator.Emit(OpCodes.Ldstr, value); generator.Emit(OpCodes.Stloc, temp); generator.Emit(OpCodes.Ldloc, temp); generator.Emit(OpCodes.Unbox_Any, propertyInfo.PropertyType); generator.Emit(OpCodes.Callvirt, propertyInfo.GetSetMethod()); } else { if (value != "") { generator.Emit(OpCodes.Ldstr, value); generator.Emit(OpCodes.Call, dateParse); generator.Emit(OpCodes.Newobj, propertyInfo.PropertyType.GetConstructor(new Type[] { t })); generator.Emit(OpCodes.Stloc, temp); generator.Emit(OpCodes.Ldloc, temp); generator.Emit(OpCodes.Callvirt, propertyInfo.GetSetMethod()); } } } } generator.Emit(OpCodes.Ldloc, result); generator.Emit(OpCodes.Ret); handler = (Delegate)method.CreateDelegate(typeof(Delegate)); return handler(json); } }
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