OpenReadCompletedEventArgs.Result 屬性

定義

命名空間:

System.Net

組件:

netstandard.dll, System.Net.WebClient.dll

來源:

WebClient.cs

取得一個可讀的串流，裡面包含由某 DownloadDataAsync 個方法下載的資料。

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

public System.IO.Stream Result { get; }

member this.Result : System.IO.Stream

Public ReadOnly Property Result As Stream

屬性值

Stream

Stream A 裡面包含下載的資料。

範例

以下程式碼範例使用了此屬性回傳的串流。

private static void OpenReadCallback2(Object sender, OpenReadCompletedEventArgs e)
{
    Stream reply = null;
    StreamReader s = null;

    try
    {
        reply = (Stream)e.Result;
        s = new StreamReader(reply);
        Console.WriteLine(s.ReadToEnd());
    }
    finally
    {
        if (s != null)
        {
            s.Close();
        }

        if (reply != null)
        {
            reply.Close();
        }
    }
}

Private Shared Sub OpenReadCallback2(ByVal sender As Object, ByVal e As OpenReadCompletedEventArgs)

    Dim reply As Stream = Nothing
    Dim s As StreamReader = Nothing

    Try

        reply = CType(e.Result, Stream)
        s = New StreamReader(reply)
        Console.WriteLine(s.ReadToEnd())
    Finally

        If Not s Is Nothing Then

            s.Close()
        End If

        If Not reply Is Nothing Then

            reply.Close()
        End If
    End Try
End Sub

備註

你應該先檢查 Error 和 Cancelled 屬性，再使用這個屬性回傳的資料。 若屬性的值為Exception物件或Cancelled屬性值為 true，則Error非同步操作未正確完成，屬性Result值將不成立。