使用Emit实现给实体赋值

public static Action<T, object> EmitSetter<T>(string propertyName) {     var type = typeof(T);     var dynamicMethod = new DynamicMethod("EmitCall", null, new[] { type, typeof(object) }, type.Module);     var iLGenerator = dynamicMethod.GetILGenerator();      var callMethod = type.GetMethod("set_" + propertyName, BindingFlags.Instance | BindingFlags.IgnoreCase | BindingFlags.Public);     var parameterInfo = callMethod.GetParameters()[0];     var local = iLGenerator.DeclareLocal(parameterInfo.ParameterType, true);      iLGenerator.Emit(OpCodes.Ldarg_1);     if (parameterInfo.ParameterType.IsValueType)     {         iLGenerator.Emit(OpCodes.Unbox_Any, parameterInfo.ParameterType); // 如果是值类型，拆箱     }     else     {         iLGenerator.Emit(OpCodes.Castclass, parameterInfo.ParameterType); // 如果是引用类型，转换     }      iLGenerator.Emit(OpCodes.Stloc, local);     iLGenerator.Emit(OpCodes.Ldarg_0);     iLGenerator.Emit(OpCodes.Ldloc, local);      iLGenerator.EmitCall(OpCodes.Callvirt, callMethod, null);     iLGenerator.Emit(OpCodes.Ret);      return dynamicMethod.CreateDelegate(typeof(Action<T, object>)) as Action<T, object>; }