如何确定互联网连接是否可用？

Question

如何确定Windows应用商店中是否有互联网连接？

Answer 1

您可以使用NetworkInformation class来检测;此示例代码添加了每当连接状态发生更改时都会调用的事件处理程序;

NetworkInformation.NetworkStatusChanged += 
    NetworkInformation_NetworkStatusChanged; // Listen to connectivity changes 

static void NetworkInformation_NetworkStatusChanged(object sender) 
{ 
    ConnectionProfile profile = 
     NetworkInformation.GetInternetConnectionProfile(); 

    if (profile.GetNetworkConnectivityLevel() >= 
       NetworkConnectivityLevel.InternetAccess) 
    { 
     // We have Internet, all is golden 
    } 
} 

当然，如果你想只检测一次，而不是收到通知时，它的变化，你可以做检查从上面不听变化事件。

Answer 2

只写了异步函数来做到这一点：

private void myPingCompletedCallback(object sender, PingCompletedEventArgs e) 
    { 
     if (e.Cancelled) 
      return; 

     if (e.Error != null) 
      return; 

     if (e.Reply.Status == IPStatus.Success) 
     { 
      //ok connected to internet, do something 
     } 
    } 

    private void checkInternet() 
    { 
     Ping myPing = new Ping(); 
     myPing.PingCompleted += new PingCompletedEventHandler(myPingCompletedCallback); 
     byte[] buffer = new byte[32]; 
     int timeout = 1000; 
     PingOptions options = new PingOptions(64, true); 
     try 
     { 
      myPing.SendAsync("google.com", timeout, buffer, options); 
     } 
     catch 
     { 
     } 
    } 

Answer 3

using Windows.Networking.Connectivity;  

public static bool IsInternetConnected() 
{ 
    ConnectionProfile connections = NetworkInformation.GetInternetConnectionProfile(); 
    bool internet = (connections != null) && 
     (connections.GetNetworkConnectivityLevel() == NetworkConnectivityLevel.InternetAccess); 
      return internet; 
}