如何去检测网络的连接状态

1. 方法定义
[DllImport("wininet.dll")]
private extern static bool InternetGetConnectedState( out int connectionDescription, int reservedValue ) ;
2. 方法说明
参数:
connectionDescription : 连接说明
reservedValue : 保留值
返回值:
true: On Line
false: Off Line
3. 调用方法
a. 你必须在你的code里引用System.Runtime.InteropServices,否则,会有编译错误
b. 定义一个变量 int I = 0;
c. 调用bool state = InternetGetConnectedState(out I,0);


using System.Runtime.InteropServices;








namespace internet






...{




public class Class1






...{




[DllImport("wininet.dll")]




private extern static bool InternetGetConnectedState( out int connectionDescription, int reservedValue ) ;






public Class1()...{}








private bool IsConnected()






...{




int I=0;




bool state = InternetGetConnectedState(out I,0);




return state;




}




}




}