DownloadStringCompletedEventArgs.Result 屬性

定義

命名空間:

System.Net

組件:

System.Net.WebClient.dll

來源:

WebClient.cs

取得 DownloadStringAsync 方法所下載的資料。

public:
 property System::String ^ Result { System::String ^ get(); };

public string Result { get; }

member this.Result : string

Public ReadOnly Property Result As String

屬性值

String

String，包含下載的資料。

範例

下列程式代碼範例會顯示這個屬性的值。

void DownloadStringCallback2( Object^ /*sender*/, DownloadStringCompletedEventArgs^ e )
{

   // If the request was not canceled and did not throw
   // an exception, display the resource.
   if (  !e->Cancelled && e->Error == nullptr )
   {
      String^ textString = dynamic_cast<String^>(e->Result);
      Console::WriteLine( textString );
   }
}

private static void DownloadStringCallback2(Object sender, DownloadStringCompletedEventArgs e)
{
    // If the request was not canceled and did not throw
    // an exception, display the resource.
    if (!e.Cancelled && e.Error == null)
    {
        string textString = (string)e.Result;

        Console.WriteLine(textString);
    }
}

Private Shared Sub DownloadStringCallback2(ByVal sender As Object, ByVal e As DownloadStringCompletedEventArgs)

    '  If the request was not canceled and did not throw
    '  an exception, display the resource.
    If e.Cancelled = False AndAlso e.Error Is Nothing Then

        Dim textString As String = CStr(e.Result)
        Console.WriteLine(textString)
    End If
End Sub

備註

您應該先檢查 和 Cancelled 屬性，Error再使用此屬性所傳回的數據。 Error如果屬性值為 Exception 物件，或Cancelled屬性值為 true，則異步操作未正確完成，且Result屬性值無效。