如何確定互聯網連接是否可用？

Question

如何確定Windows應用商店中是否有互聯網連接？

Answer 1

您可以使用NetworkInformation class來檢測;此示例代碼添加了每當連接狀態發生更改時都會調用的事件處理程序;

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 
    } 
} 

當然，如果你想只檢測一次，而不是收到通知時，它的變化，你可以做檢查從上面不聽變化事件。

Answer 2

只寫了異步函數來做到這一點：

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; 
}