[ZT]使用DynamicMethod替代反射，提高100倍的性能！（附源码）
原文转自：http://www.cnblogs.com/zc22/archive/2010/06/01/1749459.html
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前言
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反射性能实在是太恶劣，在通讯系统、数据库系统中已经无法忍受了。于是我在codeproject上找到一篇使用DynamicMethod的替代方法。http://www.codeproject.com/KB/cs/Dynamic_Code_Generation.aspx
可是作者实在也太简陋了，目前仅支持FIeld / Property，于是我扩展了。
1.支持FIeld / 带参数Constructor / Property / Index
2.操作过程和反射过程一摸一样。
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代码测试结果
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测试对象：
代码
class SomeClass
{
public int name;
public string sname;
public SomeClass()
{
}
public SomeClass(string name)
{
this.sname = name;
}
public int Name
{
get { return name; }
set { name = value; }
}
public string Sname
{
get { return sname; }
set { sname = value; }
}
public string this[int index, string name, int a, int b, string c, double d]
{
get
{
return index.ToString() + name;
}
set
{
}
}
}
{
public int name;
public string sname;
public SomeClass()
{
}
public SomeClass(string name)
{
this.sname = name;
}
public int Name
{
get { return name; }
set { name = value; }
}
public string Sname
{
get { return sname; }
set { sname = value; }
}
public string this[int index, string name, int a, int b, string c, double d]
{
get
{
return index.ToString() + name;
}
set
{
}
}
}
SetFIeld的反射 VS 动态编译
代码
//set field
public void test003()
{
SomeClass c = new SomeClass();
FieldInfo field = c.GetType().GetFields()[1];
StartTest("begin reflection.");
for (int i = 0; i < 10000000; i++)
{
field.SetValue(c, "test");
}
EndTest("end reflection");
IDynamicFieldInfo dfield = new DynamicType(c.GetType()).GetFields()[1];
StartTest("begin dynamic.");
for (int i = 0; i < 10000000; i++)
{
dfield.SetValue(c, "test");
}
EndTest("end dynamic");
}
public void test003()
{
SomeClass c = new SomeClass();
FieldInfo field = c.GetType().GetFields()[1];
StartTest("begin reflection.");
for (int i = 0; i < 10000000; i++)
{
field.SetValue(c, "test");
}
EndTest("end reflection");
IDynamicFieldInfo dfield = new DynamicType(c.GetType()).GetFields()[1];
StartTest("begin dynamic.");
for (int i = 0; i < 10000000; i++)
{
dfield.SetValue(c, "test");
}
EndTest("end dynamic");
}
测试结果：
代码
------ Test started: Assembly: Pixysoft.Framework.Reflection.dll ------
begin reflection.
end reflection
00:00:28.3593750
begin dynamic.
end dynamic
00:00:00.2500000
1 passed, 0 failed, 0 skipped, took 28.70 seconds (Ad hoc).
begin reflection.
end reflection
00:00:28.3593750
begin dynamic.
end dynamic
00:00:00.2500000
1 passed, 0 failed, 0 skipped, took 28.70 seconds (Ad hoc).
性能提高100多倍。
GetFIeld 反射VS动态编译
代码
public void test004()
{
SomeClass c = new SomeClass();
FieldInfo field = c.GetType().GetFields()[1];
StartTest("begin reflection.");
field.SetValue(c, "test");
for (int i = 0; i < 10000000; i++)
{
field.GetValue(c);
}
EndTest("end reflection");
IDynamicFieldInfo dfield = new DynamicType(c.GetType()).GetFields()[1];
dfield.SetValue(c, "test");
StartTest("begin dynamic.");
for (int i = 0; i < 10000000; i++)
{
dfield.GetValue(c);
}
EndTest("end dynamic");
}
{
SomeClass c = new SomeClass();
FieldInfo field = c.GetType().GetFields()[1];
StartTest("begin reflection.");
field.SetValue(c, "test");
for (int i = 0; i < 10000000; i++)
{
field.GetValue(c);
}
EndTest("end reflection");
IDynamicFieldInfo dfield = new DynamicType(c.GetType()).GetFields()[1];
dfield.SetValue(c, "test");
StartTest("begin dynamic.");
for (int i = 0; i < 10000000; i++)
{
dfield.GetValue(c);
}
EndTest("end dynamic");
}
测试结果
代码
------ Test started: Assembly: Pixysoft.Framework.Reflection.dll ------
begin reflection.
end reflection
00:00:18.9531250
begin dynamic.
end dynamic
00:00:00.2031250
1 passed, 0 failed, 0 skipped, took 19.25 seconds (Ad hoc).
begin reflection.
end reflection
00:00:18.9531250
begin dynamic.
end dynamic
00:00:00.2031250
1 passed, 0 failed, 0 skipped, took 19.25 seconds (Ad hoc).
提高接近100倍
GetProperty 反射VS动态编译
代码
public void test006()
{
SomeClass c = new SomeClass();
PropertyInfo property = c.GetType().GetProperties()[1];
StartTest("begin reflection.");
for (int i = 0; i < 1000000; i++)
{
property.GetValue(c, null);
}
EndTest("end reflection");
IDynamicPropertyInfo dproperty = new DynamicType(c.GetType()).GetProperties()[1];
StartTest("begin dynamic.");
for (int i = 0; i < 1000000; i++)
{
dproperty.GetValue(c, null);
}
EndTest("end dynamic");
}
{
SomeClass c = new SomeClass();
PropertyInfo property = c.GetType().GetProperties()[1];
StartTest("begin reflection.");
for (int i = 0; i < 1000000; i++)
{
property.GetValue(c, null);
}
EndTest("end reflection");
IDynamicPropertyInfo dproperty = new DynamicType(c.GetType()).GetProperties()[1];
StartTest("begin dynamic.");
for (int i = 0; i < 1000000; i++)
{
dproperty.GetValue(c, null);
}
EndTest("end dynamic");
}
测试结果
代码
------ Test started: Assembly: Pixysoft.Framework.Reflection.dll ------
begin reflection.
end reflection
00:00:05.5312500
begin dynamic.
end dynamic
00:00:00.0468750
1 passed, 0 failed, 0 skipped, took 5.66 seconds (Ad hoc).
begin reflection.
end reflection
00:00:05.5312500
begin dynamic.
end dynamic
00:00:00.0468750
1 passed, 0 failed, 0 skipped, took 5.66 seconds (Ad hoc).
依然100倍！！！
SetProperty 反射VS动态编译
代码
public void test005()
{
SomeClass c = new SomeClass();
PropertyInfo property = c.GetType().GetProperties()[0];
StartTest("begin reflection.");
for (int i = 0; i < 1000000; i++)
{
property.SetValue(c, i, null);
}
EndTest("end reflection");
IDynamicPropertyInfo dproperty = new DynamicType(c.GetType()).GetProperties()[0];
StartTest("begin dynamic.");
for (int i = 0; i < 1000000; i++)
{
dproperty.SetValue(c, i, null);
}
EndTest("end dynamic");
}
{
SomeClass c = new SomeClass();
PropertyInfo property = c.GetType().GetProperties()[0];
StartTest("begin reflection.");
for (int i = 0; i < 1000000; i++)
{
property.SetValue(c, i, null);
}
EndTest("end reflection");
IDynamicPropertyInfo dproperty = new DynamicType(c.GetType()).GetProperties()[0];
StartTest("begin dynamic.");
for (int i = 0; i < 1000000; i++)
{
dproperty.SetValue(c, i, null);
}
EndTest("end dynamic");
}
测试结果
代码
------ Test started: Assembly: Pixysoft.Framework.Reflection.dll ------
begin reflection.
end reflection
00:00:09.0625000
begin dynamic.
end dynamic
00:00:00.0468750
1 passed, 0 failed, 0 skipped, took 9.20 seconds (Ad hoc).
begin reflection.
end reflection
00:00:09.0625000
begin dynamic.
end dynamic
00:00:00.0468750
1 passed, 0 failed, 0 skipped, took 9.20 seconds (Ad hoc).
遥遥领先250倍
Constructor 反射VS动态编译
代码
public void test008()
{
Type type = typeof(SomeClass);
StartTest("begin reflection.");
for (int i = 0; i < 1000000; i++)
{
object result = Activator.CreateInstance(type, "hello");
}
EndTest("end reflection");
StartTest("begin dynamic.");
IDynamicConstructorInfo dConstructorInfo = new DynamicType(type).GetConstructors()[1];
for (int i = 0; i < 1000000; i++)
{
object result = dConstructorInfo.Invoke(new object[] { "hello" });
}
EndTest("end dynamic");
StartTest("begin dynamic.");
for (int i = 0; i < 1000000; i++)
{
object result = new DynamicType(type).GetConstructors()[1].Invoke(new object[] { "hello" });
}
EndTest("end dynamic");
}
{
Type type = typeof(SomeClass);
StartTest("begin reflection.");
for (int i = 0; i < 1000000; i++)
{
object result = Activator.CreateInstance(type, "hello");
}
EndTest("end reflection");
StartTest("begin dynamic.");
IDynamicConstructorInfo dConstructorInfo = new DynamicType(type).GetConstructors()[1];
for (int i = 0; i < 1000000; i++)
{
object result = dConstructorInfo.Invoke(new object[] { "hello" });
}
EndTest("end dynamic");
StartTest("begin dynamic.");
for (int i = 0; i < 1000000; i++)
{
object result = new DynamicType(type).GetConstructors()[1].Invoke(new object[] { "hello" });
}
EndTest("end dynamic");
}
测试结果
代码
------ Test started: Assembly: Pixysoft.Framework.Reflection.dll ------
begin reflection.
end reflection
00:00:07.5937500
begin dynamic.
end dynamic
00:00:00.1250000
begin dynamic.
end dynamic
00:00:01.2187500
1 passed, 0 failed, 0 skipped, took 9.02 seconds (Ad hoc).
begin reflection.
end reflection
00:00:07.5937500
begin dynamic.
end dynamic
00:00:00.1250000
begin dynamic.
end dynamic
00:00:01.2187500
1 passed, 0 failed, 0 skipped, took 9.02 seconds (Ad hoc).
60倍左右。
GetIndex 反射VS动态编译
代码
public void test007()
{
SomeClass c = new SomeClass();
Type type = c.GetType();
PropertyInfo property = type.GetProperties()[2];
StartTest("begin reflection.");
for (int i = 0; i < 1000000; i++)
{
property.SetValue(c, i.ToString(), new object[] { 0, "", 0, 0, "", 0 });
}
EndTest("end reflection");
IDynamicPropertyInfo dproperty = new DynamicType(type).GetProperties()[2];
StartTest("begin dynamic.");
for (int i = 0; i < 1000000; i++)
{
dproperty.SetValue(c, i.ToString(), new object[] { 0, "", 0, 0, "", (double)0 });
}
EndTest("end dynamic");
StartTest("begin dynamic set property.");
for (int i = 0; i < 1000000; i++)
{
new DynamicType(type).GetProperties()[2].SetValue(c, i.ToString(), new object[] { 0, "", 0, 0, "", (double)0 });
}
EndTest("end dynamic");
}
{
SomeClass c = new SomeClass();
Type type = c.GetType();
PropertyInfo property = type.GetProperties()[2];
StartTest("begin reflection.");
for (int i = 0; i < 1000000; i++)
{
property.SetValue(c, i.ToString(), new object[] { 0, "", 0, 0, "", 0 });
}
EndTest("end reflection");
IDynamicPropertyInfo dproperty = new DynamicType(type).GetProperties()[2];
StartTest("begin dynamic.");
for (int i = 0; i < 1000000; i++)
{
dproperty.SetValue(c, i.ToString(), new object[] { 0, "", 0, 0, "", (double)0 });
}
EndTest("end dynamic");
StartTest("begin dynamic set property.");
for (int i = 0; i < 1000000; i++)
{
new DynamicType(type).GetProperties()[2].SetValue(c, i.ToString(), new object[] { 0, "", 0, 0, "", (double)0 });
}
EndTest("end dynamic");
}
测试结果
代码
------ Test started: Assembly: Pixysoft.Framework.Reflection.dll ------
begin reflection.
end reflection
00:00:07.2656250
begin dynamic.
end dynamic
00:00:00.5000000
begin dynamic set property.
end dynamic
00:00:01.7968750
1 passed, 0 failed, 0 skipped, took 9.64 seconds (Ad hoc).
begin reflection.
end reflection
00:00:07.2656250
begin dynamic.
end dynamic
00:00:00.5000000
begin dynamic set property.
end dynamic
00:00:01.7968750
1 passed, 0 failed, 0 skipped, took 9.64 seconds (Ad hoc).
30倍左右（性能损失在了装箱拆箱）
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源码下载与备注
----------------------
http://www.boxcn.net/shared/8qqgob51hi
空间由boxcn.net提供，放心下载。
开始的时候，想到老赵的反射开源，可是他用Linq去实现，在dotnet 2.0不支持，而现状是大部分服务器应用还是dotnet 2.0, 只好放弃。
之后codeproject找到了篇文章介绍了DynamicMethod，可是作者写的比较龊，于是我稍微扩展了，直接参考Type的模型设计，得到了DynamicType，然后接下来的操作也TYpe一样。
目前MethodInfo无法使用DynamicMethod替代，因为存在了范型，无法使用通用的delegate去模拟。。。
本来以为，通过DynamicMethod，最少能提高性能10倍吧，可是用在了项目上，却发现没有变化！！！！
我在序列化中使用，却发现性能根本没有太大的提升，后来发现反射去Get/Set实际占性能损失很小，另外一大部分在
1. 集合的操作（List / Dictionary / ...)
2. Type.GetProperties 等类似的操作。
3. attribute的获取操作。
没办法，看来要继续努力，接下来打算把整个Type对象使用Dynamic去托管了。
