推荐一个快速反射调用的类

使用传统的.net反射机制，调用类的方法时，在调用频率大的情况下，会感觉速度很慢。最近浏览卢彦的博客时，找到一个他改进后的反射调用类。试用以后感觉效率明显提高，特推荐给大家。作者重新实现了，反射调用方法，但是调用接口和.net原有方法一致。而且调用时抛出的异常为所调用类的实际异常，不像传统方式返回为包装异常。
文章来源：http://www.codeproject.com/csharp/FastMethodInvoker.asp

快速反射调用类

using System;

using System.Collections.Generic;

using System.Text;

using System.Reflection;

using System.Reflection.Emit;

namespace FastMethodInvoker

{

class FastInvoke

{

public delegate object FastInvokeHandler(object target, object[] paramters);

static object InvokeMethod(FastInvokeHandler invoke, object target, params object[] paramters)

{

return invoke(null, paramters);

}

public static FastInvokeHandler GetMethodInvoker(MethodInfo methodInfo)

{

DynamicMethod dynamicMethod = new DynamicMethod(string.Empty, typeof(object), new Type[]

{ typeof(object), typeof(object[]) }, methodInfo.DeclaringType.Module);

ILGenerator il = dynamicMethod.GetILGenerator();

ParameterInfo[] ps = methodInfo.GetParameters();

Type[] paramTypes = new Type[ps.Length];

for (int i = 0; i < paramTypes.Length; i++)

{

if (ps[i].ParameterType.IsByRef)

paramTypes[i] = ps[i].ParameterType.GetElementType();

else

paramTypes[i] = ps[i].ParameterType;

}

LocalBuilder[] locals = new LocalBuilder[paramTypes.Length];

for (int i = 0; i < paramTypes.Length; i++)

{

locals[i] = il.DeclareLocal(paramTypes[i], true);

}

for (int i = 0; i < paramTypes.Length; i++)

{

il.Emit(OpCodes.Ldarg_1);

EmitFastInt(il, i);

il.Emit(OpCodes.Ldelem_Ref);

EmitCastToReference(il, paramTypes[i]);

il.Emit(OpCodes.Stloc, locals[i]);

}

if (!methodInfo.IsStatic)

{

il.Emit(OpCodes.Ldarg_0);

}

for (int i = 0; i < paramTypes.Length; i++)

{

if (ps[i].ParameterType.IsByRef)

il.Emit(OpCodes.Ldloca_S, locals[i]);

else

il.Emit(OpCodes.Ldloc, locals[i]);

}

if (methodInfo.IsStatic)

il.EmitCall(OpCodes.Call, methodInfo, null);

else

il.EmitCall(OpCodes.Callvirt, methodInfo, null);

if (methodInfo.ReturnType == typeof(void))

il.Emit(OpCodes.Ldnull);

else

EmitBoxIfNeeded(il, methodInfo.ReturnType);

for (int i = 0; i < paramTypes.Length; i++)

{

if (ps[i].ParameterType.IsByRef)

{

il.Emit(OpCodes.Ldarg_1);

EmitFastInt(il, i);

il.Emit(OpCodes.Ldloc, locals[i]);

if (locals[i].LocalType.IsValueType)

il.Emit(OpCodes.Box, locals[i].LocalType);

il.Emit(OpCodes.Stelem_Ref);

}

il.Emit(OpCodes.Ret);

FastInvokeHandler invoder = (FastInvokeHandler)dynamicMethod.CreateDelegate(typeof(FastInvokeHandler));

return invoder;

}

private static void EmitCastToReference(ILGenerator il, System.Type type)

{

if (type.IsValueType)

{

il.Emit(OpCodes.Unbox_Any, type);

}

else

{

il.Emit(OpCodes.Castclass, type);

}

private static void EmitBoxIfNeeded(ILGenerator il, System.Type type)

{

if (type.IsValueType)

{

il.Emit(OpCodes.Box, type);

}

private static void EmitFastInt(ILGenerator il, int value)

{

switch (value)

{

case -1:

il.Emit(OpCodes.Ldc_I4_M1);

return;

case 0:

il.Emit(OpCodes.Ldc_I4_0);

return;

case 1:

il.Emit(OpCodes.Ldc_I4_1);

return;

case 2:

il.Emit(OpCodes.Ldc_I4_2);

return;

case 3:

il.Emit(OpCodes.Ldc_I4_3);

return;

case 4:

il.Emit(OpCodes.Ldc_I4_4);

return;

case 5:

il.Emit(OpCodes.Ldc_I4_5);

return;

case 6:

il.Emit(OpCodes.Ldc_I4_6);

return;

case 7:

il.Emit(OpCodes.Ldc_I4_7);

return;

case 8:

il.Emit(OpCodes.Ldc_I4_8);

return;

}

if (value > -129 && value < 128)

{

il.Emit(OpCodes.Ldc_I4_S, (SByte)value);

}

else

{

il.Emit(OpCodes.Ldc_I4, value);

}

效果测试程序

using System;

using System.Reflection;

using System.Reflection.Emit;

using System.Collections.Generic;

using System.Text;

using System.Diagnostics;

namespace FastMethodInvoker

{

class Program

{

static void Main(string[] args)

{

Type t = typeof(Person);

MethodInfo methodInfo = t.GetMethod("Say");

Person person = new Person();

string word = "hello";

Person p = null;

object[] param = new object[]

{ word, p, 3 };

int TestTimes = 100000; //测试次数，可自行调节看效果

传统方式反射#region 传统方式反射

try

{

Stopwatch watch = new Stopwatch();

watch.Start();

for (int i = 0; i < TestTimes; i++)

{

methodInfo.Invoke(person, param);

}

watch.Stop();

Console.WriteLine(TestTimes.ToString() + " times invoked by Reflection: " + watch.ElapsedMilliseconds + "ms");

}

catch (System.Exception ex)

{

Console.WriteLine("传统方式反射直接错误:" + ex.Message);

Console.WriteLine("传统方式反射内部错误:" + ex.InnerException.Message);

}

#endregion

快速反射#region 快速反射

try

{

Stopwatch watch1 = new Stopwatch();

FastInvoke.FastInvokeHandler fastInvoker = FastInvoke.GetMethodInvoker(methodInfo);

watch1.Start();

for (int i = 0; i < TestTimes; i++)

{

fastInvoker(person, param);

}

watch1.Stop();

Console.WriteLine(TestTimes.ToString() + " times invoked by FastInvoke: " + watch1.ElapsedMilliseconds + "ms");

}

catch (System.Exception ex)

{

Console.WriteLine("快速反射错误:" + ex.Message);

}

#endregion

直接调用#region 直接调用

try

{

Stopwatch watch2 = new Stopwatch();

watch2.Start();

for (int i = 0; i < TestTimes; i++)

{

person.Say(ref word, out p, 3);

}

watch2.Stop();

Console.WriteLine(TestTimes.ToString() + " times invoked by DirectCall: " + watch2.ElapsedMilliseconds + "ms");

}

catch (System.Exception ex)

{

Console.WriteLine("直接调用错误:" + ex.Message);

}

#endregion

Console.ReadLine();

}

public class Person

{

public void Say(ref string word, out Person p, int avi)

{

word = "ttt" + avi.ToString();

p = new Person();

//throw new System.Exception("出错了哦");

}

转载于:https://www.cnblogs.com/haoliansheng/archive/2009/06/01/1493909.html

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