RunWorkerCompletedEventArgs Class
Provides data for the MethodNameCompleted event.
System::EventArgs
System.ComponentModel::AsyncCompletedEventArgs
System.ComponentModel::RunWorkerCompletedEventArgs
Assembly: System (in System.dll)
The RunWorkerCompletedEventArgs type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | RunWorkerCompletedEventArgs | Initializes a new instance of the RunWorkerCompletedEventArgs class. |
| Name | Description | |
|---|---|---|
![]() | Cancelled | Gets a value indicating whether an asynchronous operation has been canceled. (Inherited from AsyncCompletedEventArgs.) |
![]() | Error | Gets a value indicating which error occurred during an asynchronous operation. (Inherited from AsyncCompletedEventArgs.) |
![]() | Result | Gets a value that represents the result of an asynchronous operation. |
![]() | UserState | Gets a value that represents the user state. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | RaiseExceptionIfNecessary | Raises a user-supplied exception if an asynchronous operation failed. (Inherited from AsyncCompletedEventArgs.) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
If you are using a class that implements the Event-based Asynchronous Pattern Overview, the class provides a MethodNameCompleted event. MethodName is a placeholder for the first part of the method's name. BackgroundWorker::OnRunWorkerCompleted is an example of the name of such a method. If you add an instance of the RunWorkerCompletedEventArgs delegate to the event, you will receive information about the outcome of asynchronous operations in the RunWorkerCompletedEventArgs parameter of the corresponding event handler.
Note |
|---|
The HostProtectionAttribute attribute applied to this class has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes. |
Note |
|---|
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes. |
The following code example illustrates the use of RunWorkerCompletedEventArgs. This example is part of a larger sample for the BackgroundWorker class.
// This event handler deals with the results of the // background operation. void backgroundWorker1_RunWorkerCompleted( Object^ /*sender*/, RunWorkerCompletedEventArgs^ e ) { // First, handle the case where an exception was thrown. if ( e->Error != nullptr ) { MessageBox::Show( e->Error->Message ); } else if ( e->Cancelled ) { // Next, handle the case where the user cancelled // 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 = "Cancelled"; } else { // 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; }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
