Windows phone 8，檢查wifi是否打開？

Question

我想爲Windows Phone開一個笑話應用程序。該應用程序從互聯網上得到笑話，所以我希望它能夠檢查WiFi信號或能夠連接到互聯網。我將如何去創建它？

Answer 1

在WP8.1運行，您可以查詢大多數的這些東西從NetworkInformation類，像這樣：

// need this namespace 
using Windows.Networking.Connectivity; 

bool is_wifi_connected = false; 
ConnectionProfile current_connection_for_internet = NetworkInformation.GetInternetConnectionProfile(); 
if (current_connection_for_internet.IsWlanConnectionProfile) 
{   
    if (current_connection_for_internet.GetNetworkConnectivityLevel() == NetworkConnectivityLevel.InternetAccess) 
    { 
     is_wifi_connected = true; 
    }   
} 

---

WP8.0可以查詢大多數的這些東西從NetworkInterfaceList像這樣：

// see is wifi is ON and connected 
using Microsoft.Phone.Net.NetworkInformation; 

bool is_wifi_connected = false; 
if (NetworkInterface.GetIsNetworkAvailable()) 
{ 
    NetworkInterfaceList nif = new NetworkInterfaceList(); 
    foreach(NetworkInterfaceInfo item in nif) 
    { 
     if (item.InterfaceSubtype == NetworkInterfaceSubType.WiFi && item.InterfaceState == ConnectState.Connected) 
     { 
      is_wifi_connected = true; 
     } 
    } 
} 

---

我們看看它是否可以連接到該網站只是打開一個連接。你可以使用任何你喜歡的網絡連接。當文件完成下載時，只需要使用WebClient和事件處理程序來完成此操作。

using System.Net; 

// check network and is_wifi_connected 
if (System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable() && is_wifi_connected) 
{ 
    WebClient downloader = new WebClient(); 
    Uri uri = new Uri("http://www.google.com", UriKind.Absolute); 
    downloader.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DownloadDone); 
    downloader.DownloadStringAsync(uri); 
} 

void DownloadDone(object sender, DownloadStringCompletedEventArgs e) 
{ 
    if (e.Result == null || e.Error != null) 
    { 
     MessageBox.Show("There was an error downloading the site."); 
    } 
    else 
    { 
     // your html file or what not is stored here 
     string content = e.Result; 
    } 
}