public void add1(int x, int y, string z)
{
Type type = GetType();
ProxyAttribute customAttribute = type.GetCustomAttribute <ProxyAttribute>();
if (customAttribute != null)
{
customAttribute.AfterCall();
}
Console.WriteLine("结果:" + (this.me + x + y + Convert.ToInt32(z)));
}
/// <summary>
///
/// </summary>
/// <param name="sourceType">源类型</param>
/// <param name="interfaceType">源类型实现的接口(规范)</param>
/// <returns>代理类型</returns>
public static Type ProxyTypeBuilder(Type sourceType, Type interfaceType)
{
if (!interfaceType.IsInterface)
{
throw new Exception("不是接口类型");
}
if (!sourceType.IsClass)
{
throw new Exception("不是Class类型");
}
TypeBuilder defClassBuilder = CreateDynamicTypeBuild(sourceType.Name + "Proxy");
defClassBuilder.AddInterfaceImplementation(interfaceType);
#region 编写字段 代理字段
FieldBuilder _testfb = defClassBuilder.DefineField("_" + sourceType.Name, sourceType, FieldAttributes.Private);
#endregion
#region 编写构造 默认模式
var constructor = sourceType.GetConstructors()[0];
var sourceTypeCP = constructor.GetParameters().Select(o => o.ParameterType);
var constructorParameters = new List <Type>();
//constructorParameters.Add(sourceType);
constructorParameters.AddRange(sourceTypeCP);
ConstructorBuilder dfltConstrBld = defClassBuilder.DefineConstructor(
MethodAttributes.Public,
CallingConventions.HasThis,
constructorParameters.ToArray()
);
var constructorIL = dfltConstrBld.GetILGenerator();
LocalBuilder _obj = constructorIL.DeclareLocal(sourceType);
for (short i = 0; i < constructorParameters.Count; i++)
{
constructorIL.Emit(OpCodes.Ldarg, i + 1);
}
constructorIL.Emit(OpCodes.Newobj, sourceType.GetConstructor(sourceTypeCP.ToArray()));
constructorIL.Emit(OpCodes.Stloc, _obj);//局部变量赋值
constructorIL.Emit(OpCodes.Ldarg_0); //this
constructorIL.Emit(OpCodes.Ldloc, _obj); //局部变量入栈
constructorIL.Emit(OpCodes.Stfld, _testfb);
constructorIL.Emit(OpCodes.Ret); //函数返回
#endregion
#region 编写构造 注入模式
ConstructorBuilder ConstrBld_1 = defClassBuilder.DefineConstructor(
MethodAttributes.Public,
CallingConventions.HasThis,
new Type[] { sourceType }
);
var ConstrBld_IL = ConstrBld_1.GetILGenerator();
ConstrBld_IL.Emit(OpCodes.Ldarg_0); //this
ConstrBld_IL.Emit(OpCodes.Ldarg_1); //
ConstrBld_IL.Emit(OpCodes.Stfld, _testfb);
ConstrBld_IL.Emit(OpCodes.Ret); //函数返回
#endregion
#region 定义方法
var Methods = interfaceType.GetMethods();
//排除obj基类方法
var methods = Methods.Where(m => m.Name != "GetHashCode" || m.Name != "Equals" || m.Name != "ToString" || m.Name != "ReferenceEquals");
foreach (var method in methods)
{
ProxyAttribute proxyAttribute = null;
var attributes = method.GetCustomAttributes(true);
var attribute = attributes.FirstOrDefault(o => { return(o is ProxyAttribute); });
if (attribute != null)
{
proxyAttribute = (ProxyAttribute)attribute;
}
//定义一个方法
var parameterTypes = method.GetParameters().Select(o => o.ParameterType).ToArray();
var methodBldr = defClassBuilder.DefineMethod(method.Name,
MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.Virtual,
method.ReturnType,
parameterTypes
);
Expression <Func <int, int, string, int> > add = (x, y, z) => 1 + 2;
//add.CompileToMethod(methodBldr);
ILGenerator ilOfShow = methodBldr.GetILGenerator();
//方法调之前
LocalBuilder returnType = ilOfShow.DeclareLocal(method.ReturnType);
//非静态方法参数索引从1开始
//ilOfShow.Emit(OpCodes.Ldstr, "姓名：{1} 年龄：{0}");
#region 调用方法之前
//ilOfShow.Emit(OpCodes.Ldarg_1);
//ilOfShow.Emit(OpCodes.Ldarg_2);
//ilOfShow.Emit(OpCodes.Add)
//ilOfShow.Emit(OpCodes.Ldstr, "调用方法之前");
//ilOfShow.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }));
if (proxyAttribute != null)
{
ilOfShow.Emit(OpCodes.Newobj, proxyAttribute.GetType().GetConstructor(new Type[0]));
ilOfShow.Emit(OpCodes.Call, proxyAttribute.GetType().GetMethod("AfterCall", new Type[0]));
//ilOfShow.Emit(OpCodes.Pop);
}
#endregion
#region 调用方法等同于 ReturnType result= method(arg1,arg2,....);
ilOfShow.Emit(OpCodes.Ldarg_0);
ilOfShow.Emit(OpCodes.Ldfld, _testfb);
for (short i = 0; i < parameterTypes.Length; i++)
{
ilOfShow.Emit(OpCodes.Ldarg, i + 1);
}
//ilOfShow.Emit(OpCodes.Ldarg_1);
//ilOfShow.Emit(OpCodes.Ldarg_2);
ilOfShow.Emit(OpCodes.Call, sourceType.GetMethod(method.Name, parameterTypes));
ilOfShow.Emit(OpCodes.Stloc, returnType);//赋值语句
#endregion
#region 调用方法之后
//ilOfShow.Emit(OpCodes.Ldstr, "调用方法之后");
//ilOfShow.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }));
if (proxyAttribute != null)
{
ilOfShow.Emit(OpCodes.Newobj, proxyAttribute.GetType().GetConstructor(new Type[0]));
ilOfShow.Emit(OpCodes.Call, proxyAttribute.GetType().GetMethod("AfterCall", new Type[0]));
//ilOfShow.Emit(OpCodes.Pop);
}
#endregion
ilOfShow.Emit(OpCodes.Ldloc, returnType); //加载局部变量
ilOfShow.Emit(OpCodes.Ret); //函数返回
}
#endregion
Type t = defClassBuilder.CreateType();
assemblyBuilder.Save("MyClass.dll");
//assembly = assemblyBuilder.
return(t);
}