直接方式，反射方式，dynamic方式性能比较
先上测试代码
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using System.Text;
namespace Model
{
public partial class Class1
{
public Class1()
{ }
private string _s = "";
private int _i = 0;
private decimal _d = 0;
private StringBuilder _sb = new StringBuilder();
public string S
{
set { _s = value; }
get { return _s; }
}
public int I
{
set { _i = value; }
get { return _i; }
}
public decimal D
{
set { _d = value; }
get { return _d; }
}
public StringBuilder SB
{
set { _sb = value; }
get { return _sb; }
}
public int func()
{
int s = 0;
for (int i = 0; i < 1000; i++)
{
s = s + i;
}
return s;
}
}
}
///////////////////////////////////////////////////////////////////////
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Model;
using System.Reflection;
using System.Diagnostics;
namespace testReflect
{
class Program
{
static void Main(string[] args)
{
const int count = 100000;
Console.WriteLine("count="+count);
Stopwatch sw = new Stopwatch();
StringBuilder test = new StringBuilder();
sw.Restart();
for (int i = 0; i < count; i++)
{
Class1 m = new Class1();
m.D = 100;
m.I = 200;
m.S = "string";
m.SB = new StringBuilder("StringBuilder");
test.Append(m.D);
test.Append(m.I);
test.Append(m.S);
test.Append(m.SB);
}
sw.Stop();
Console.WriteLine("直接创建,赋值并访问内存中对象属性： " + sw.ElapsedTicks);
//Console.WriteLine("直接创建,赋值并访问内存中对象属性： " + sw.ElapsedTicks);
long basic = sw.ElapsedTicks;
sw.Restart();
test = new StringBuilder();
for (int i = 0; i < count; i++)
{
var t = typeof(Class1);
ConstructorInfo ct = t.GetConstructor(new Type[] { });
var m = ct.Invoke(null);
PropertyInfo pd = t.GetProperty("D");
pd.SetValue(m, 100m, null);
PropertyInfo pi = t.GetProperty("I");
pi.SetValue(m, 200, null);
PropertyInfo ps = t.GetProperty("S");
ps.SetValue(m, "string", null);
PropertyInfo psb = t.GetProperty("StringBuilder");
PropertyInfo[] props = m.GetType().GetProperties();
foreach (var p in props)
{
test.Append(p.GetValue(m, null));
}
}
sw.Stop();
Console.WriteLine("反射创建，赋值并访问内存中对象属性： " + sw.ElapsedTicks + "(" + sw.ElapsedTicks / basic + ")");
test = new StringBuilder();
sw.Restart();
for (int i = 0; i < count; i++)
{
dynamic dm = new Class1();
dm.D = 100;
dm.I = 200;
dm.S = "string";
dm.SB = new StringBuilder("StringBuilder");
test.Append(dm.D);
test.Append(dm.I);
test.Append(dm.S);
test.Append(dm.SB);
}
sw.Stop();
Console.WriteLine("dynamic直接创建，赋值并访问内存中对象属性：" + sw.ElapsedTicks + "(" + sw.ElapsedTicks / basic + ")");
test = new StringBuilder();
sw.Restart();
for (int i = 0; i < count; i++)
{
var t = typeof(Class1);
ConstructorInfo ct = t.GetConstructor(new Type[] { });
dynamic dm = ct.Invoke(null);
dm.D = 100;
dm.I = 200;
dm.S = "string";
dm.SB = new StringBuilder("StringBuilder");
test.Append(dm.D);
test.Append(dm.I);
test.Append(dm.S);
test.Append(dm.SB);
}
sw.Stop();
Console.WriteLine("dynamic反射创建，赋值并访问内存中对象属性：" + sw.ElapsedTicks + "(" + sw.ElapsedTicks / basic + ")");
test = new StringBuilder();
sw.Restart();
for (int i = 0; i < count; i++)
{
Class1 m = new Class1();
test.Append(m.func());
}
sw.Stop();
Console.WriteLine("直接调用内存中对象方法： " + sw.ElapsedTicks + "(" + sw.ElapsedTicks / basic + ")");
sw.Restart();
test = new StringBuilder();
for (int i = 0; i < count; i++)
{
var t = typeof(Class1);
MethodInfo meth = t.GetMethod("func");
ConstructorInfo ct = t.GetConstructor(new Type[] { });
test.Append(meth.Invoke(ct.Invoke(null), null));
}
sw.Stop();
Console.WriteLine("反射调用内存中对象方法： " + sw.ElapsedTicks + "(" + sw.ElapsedTicks / basic + ")");
test = new StringBuilder();
sw.Restart();
for (int i = 0; i < count; i++)
{
dynamic dm = new Class1();
test.Append(dm.func());
}
sw.Stop();
Console.WriteLine("dynamic直接调用内存中对象方法：" + sw.ElapsedTicks + "(" + sw.ElapsedTicks / basic + ")");
test = new StringBuilder();
sw.Restart();
for (int i = 0; i < count; i++)
{
var t = typeof(Class1);
ConstructorInfo ct = t.GetConstructor(new Type[] { });
dynamic dm = ct.Invoke(null);
test.Append(dm.func());
}
sw.Stop();
Console.WriteLine("dynamic反射调用内存中对象方法：" + sw.ElapsedTicks + "(" + sw.ElapsedTicks / basic + ")");
Console.WriteLine("###############################");
sw.Restart();
test = new StringBuilder();
for (int i = 0; i < count; i++)
{
Assembly a = Assembly.LoadFile(AppDomain.CurrentDomain.BaseDirectory + @"\Model.dll");
var t = a.GetType("Model.Class1");
ConstructorInfo ct = t.GetConstructor(new Type[] { });
var rm = ct.Invoke(null);
PropertyInfo pd = t.GetProperty("D");
pd.SetValue(rm, 100m, null);
PropertyInfo pi = t.GetProperty("I");
pi.SetValue(rm, 200, null);
PropertyInfo ps = t.GetProperty("S");
ps.SetValue(rm, "string", null);
PropertyInfo psb = t.GetProperty("SB");
psb.SetValue(rm, new StringBuilder("StringBuilder"), null);
PropertyInfo[] props = t.GetProperties();
foreach (var p in props)
{
test.Append(p.GetValue(rm, null));
}
}
sw.Stop();
Console.WriteLine("使用反射加载程序集，创建，赋值，访问，对象属性： " + sw.ElapsedTicks + "(" + sw.ElapsedTicks / basic + ")");
sw.Restart();
test = new StringBuilder();
for (int i = 0; i < count; i++)
{
Assembly a = Assembly.LoadFile(AppDomain.CurrentDomain.BaseDirectory + @"\Model.dll");
var t = a.GetType("Model.Class1");
ConstructorInfo ct = t.GetConstructor(new Type[] { });
dynamic dm = ct.Invoke(null);
dm.D = 100m;
dm.I = 200;
dm.S = "string";
dm.SB = new StringBuilder("StringBuilder");
test.Append(dm.D);
test.Append(dm.I);
test.Append(dm.S);
test.Append(dm.SB);
}
sw.Stop();
Console.WriteLine("dynamic赋值，使用反射加载程序集，创建，赋值，访问，对象属性： " + sw.ElapsedTicks + "(" + sw.ElapsedTicks / basic + ")");
}
}
}
分别循环1000,10000,50000,100000次
所得到的数据显示，直接创建赋值是快速的方法。
反射创建所需要的时间比依次是9x,15x,15x,15x
对于两种dynamic，
所需的时间比依次是36,8,3,2和7,4,3,3。说明了在反复调用次数少的情况下，dynamic方式并不优于反射，但是在反复调用次数多的情况下，使用dynamic方式优于直接使用反射。两种dynamic方式在调用次数多的情况下，差距也不是很多
对于方法的调用，发现，时间比都差不多。反射稍慢一点。dynamic方式略占优势。
对于加载assembly的方式，绝对是最慢的，通常要在100-150倍左右。
此处我想强调的是，虽然速度差别很大，但是通常的代码运行很少有循环1000次10000次的。即便有，其绝对值还是很小的。相对网络延迟开销，反射所花去的开销可以忽略不计。因此，因为性能问题拒绝反射是愚蠢的。使用dynamic类型，相对反射来说，代码可以写的更优雅。
以上数据，仅供参考。
附件：http://down.51cto.com/data/2361091
网站题目：直接方式，反射方式，dynamic方式性能比较
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