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check your internet connection with c#
by simohamed attahri
用c#检测你的网络连接
how to check if your computer is connected to the internet with c#. its much more easier that other tutorials ive seen in other sites. in deed, were going to use a simple api function internetgetconnectedstate, to return a boolean variable.
怎么用c#来检测你的计算机是否连接到互联网呢？这可能是我见过最简单的教程了。其实我们就是使用一个简单的internetgetconnectedstate api函数，结果是返回一个boolean类型的变量。
this function takes two arguments :
这个函数有两个参数：
the first one is an integer used with out keyword, that means that after calling the function, the variable will contain an interger that describes the connection state ( use of a modem, use of a proxy, offline mode…). note that you must refer to www.msdn.com for more information about that.
the second one is a reserved variable that must be set to 0.
第一个是带有out关键字的整型数，也就是说在调用函数后，变量应该包含一个描述连接状态（使用调制解调器、使用代理、离线模式）的整型数。你可以到www.msdn.com获取更多相关信息。
第二个参数设置为零的保留变量。
in this tutorial, well create a class with a static function that returns true if connected and false if not, using our api function in private state.
在这篇教程中，我们建立一个有着静态函数的类，在私有域使用api函数。如果连通则返回true否则返回false。
check this out :
using system ;
using system.runtime ;
using system.runtime.interopservices ;
public class internetcs
{
//creating the extern function…
[dllimport("wininet.dll")]
private extern static bool internetgetconnectedstate( int out description, int reservedvalue ) ;
//creating a function that uses the api function…
public static bool isconnectedtointernet( )
{
int desc ;
return internetgetconnectedstate( out desc, 0 ) ;
}
}
