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BackgroundWorker.IsBusy Eigenschaft

Definition

Namespace:
System.ComponentModel
Assemblys:
System.dll, System.ComponentModel.EventBasedAsync.dll
Assemblys:
netstandard.dll, System.ComponentModel.EventBasedAsync.dll
Assembly:
System.ComponentModel.EventBasedAsync.dll
Assembly:
System.dll
Assembly:
netstandard.dll
Quelle:
BackgroundWorker.cs
Quelle:
BackgroundWorker.cs
Quelle:
BackgroundWorker.cs
Quelle:
BackgroundWorker.cs
Quelle:
BackgroundWorker.cs

Ruft einen Wert ab, der angibt, ob ein BackgroundWorker asynchroner Vorgang ausgeführt wird.

public:
 property bool IsBusy { bool get(); };
public bool IsBusy { get; }
[System.ComponentModel.Browsable(false)]
public bool IsBusy { get; }
member this.IsBusy : bool
[<System.ComponentModel.Browsable(false)>]
member this.IsBusy : bool
Public ReadOnly Property IsBusy As Boolean

Eigenschaftswert

Boolean

true, wenn ein BackgroundWorker asynchroner Vorgang ausgeführt wird; andernfalls false.

Attribute
BrowsableAttribute

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die IsBusy Eigenschaft verwendet wird, um auf den Abschluss eines BackgroundWorker Vorgangs zu warten. Dieses Codebeispiel ist Teil eines größeren Beispiels, das unter How to: Download a File in the Background beschrieben wird.

void downloadButton_Click(object sender, EventArgs e)
{
    // Start the download operation in the background.
    backgroundWorker1.RunWorkerAsync();

    // Disable the button for the duration of the download.
    downloadButton.Enabled = false;

    // Once you have started the background thread you
    // can exit the handler and the application will
    // wait until the RunWorkerCompleted event is raised.

    // Or if you want to do something else in the main thread,
    // such as update a progress bar, you can do so in a loop
    // while checking IsBusy to see if the background task is
    // still running.

    while (backgroundWorker1.IsBusy)
    {
        progressBar1.Increment(1);
        // Keep UI messages moving, so the form remains
        // responsive during the asynchronous operation.
        Application.DoEvents();
    }
}

Private Sub downloadButton_Click( _
    ByVal sender As Object, _
    ByVal e As EventArgs) _
    Handles downloadButton.Click

    ' Start the download operation in the background.
    Me.backgroundWorker1.RunWorkerAsync()

    ' Disable the button for the duration of the download.
    Me.downloadButton.Enabled = False

    ' Once you have started the background thread you 
    ' can exit the handler and the application will 
    ' wait until the RunWorkerCompleted event is raised.

    ' If you want to do something else in the main thread,
    ' such as update a progress bar, you can do so in a loop 
    ' while checking IsBusy to see if the background task is
    ' still running.
    While Me.backgroundWorker1.IsBusy
        progressBar1.Increment(1)
        ' Keep UI messages moving, so the form remains 
        ' responsive during the asynchronous operation.
        Application.DoEvents()
    End While
End Sub

Hinweise

Beim BackgroundWorker Aufrufen RunWorkerAsyncwird ein asynchroner Vorgang gestartet.

Gilt für:

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