c#4的动态特性

1.调用COM组件：

Type type = Type.GetTypeFromProgID("VisualPHD.Data");   
dynamic phd = Activator.CreateInstance(type);
phd.HostName = "192.168.53.186";
2. 反射调用dotNet类
Type type = Type.GetType("ConsoleApplication1.Test"); 
dynamic t = Activator.CreateInstance(type);  
t.Print("你好！"); 
 
3. 使用PInvoke更简单
下载开源组件http://code.google.com/p/dynamicdllimport/ 
可以使用下面方面调用非托管dll，包括Windows api和自己开发的c格式dll
dynamic user32 = new DynamicDllImport("user32.dll", callingConvention : CallingConvention.Winapi);
user32.MessageBox(0, "Hello World", "Platform Invoke Sample", 0);
dynamic asmproject = new DynamicDllImport("asmproject.dll");
int value = asmproject.add<int>(3, 4);
Console.WriteLine(value); 
dynamic sdl = new DynamicDllImport("SDL.dll", CharSet.Ansi);
Sdl.SDL_Rect rect = new Sdl.SDL_Rect(
                    0,
                    0,
                    (short)width,
                    (short)height);
int result = sdl.SDL_FillRect<int>(rgbSurfacePtr, ref rect, 0);
Sdl.SDL_Event evt;
while (sdl.SDL_WaitEvent(out evt) != 0)
{
   if (evt.type == Sdl.SDL_QUIT)
   {
       break;
    }
}