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RunWorkerCompletedEventArgs.Result Property


Gets a value that represents the result of an asynchronous operation.

Namespace:   System.ComponentModel
Assembly:  System (in System.dll)

public object Result { get; }

Property Value

Type: System.Object

An Object representing the result of an asynchronous operation.

Exception Condition

Error is not null. The InnerException property holds a reference to Error.


Cancelled is true.

Your RunWorkerCompleted event handler should always check the Error and Cancelled properties before accessing the Result property. If an exception was raised or if the operation was canceled, accessing the Result property raises an exception.

The following code example demonstrates the use of the RunWorkerCompleted event to handle the result of an asynchronous operation. This code example is part of a larger example provided for the BackgroundWorker class.

// This event handler deals with the results of the
// background operation.
private void backgroundWorker1_RunWorkerCompleted(
    object sender, RunWorkerCompletedEventArgs e)
    // First, handle the case where an exception was thrown.
    if (e.Error != null)
    else if (e.Cancelled)
        // Next, handle the case where the user canceled 
        // the operation.
        // Note that due to a race condition in 
        // the DoWork event handler, the Cancelled
        // flag may not have been set, even though
        // CancelAsync was called.
        resultLabel.Text = "Canceled";
        // Finally, handle the case where the operation 
        // succeeded.
        resultLabel.Text = e.Result.ToString();

    // Enable the UpDown control.
    this.numericUpDown1.Enabled = true;

    // Enable the Start button.
    startAsyncButton.Enabled = true;

    // Disable the Cancel button.
    cancelAsyncButton.Enabled = false;

Universal Windows Platform
Available since 10
.NET Framework
Available since 2.0
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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