单选题You are creating a Windows Forms application by using the .Net Framework 3.5.You create an instance of a Backgroundworker component named backgroundWorker1 to process operations that take a long time.You discover that when the application attempts to report the progress，you receive a System.InvalidOperationException exception when executing thebackgroundWorker1.ReportProgress method.You need to configure the BackgroundWorker component appropriately to prevent the application from generating exceptions. What should yo do？（）ASet the Result property of the DoWorkEventArgs instance to True before you attempt to report the progress.BSet the CancellationPending property of backgroundWorker1 to True before you attempt to report the background processCSet the WorkerReportsProgress property of backgroundWorker1 to True before you attempt to report the background process.DReport the progress of the background process in the backgroundWorker1_ProgressChanged event.
单选题
You are creating a Windows Forms application by using the .Net Framework 3.5.You create an instance of a Backgroundworker component named backgroundWorker1 to process operations that take a long time.You discover that when the application attempts to report the progress，you receive a System.InvalidOperationException exception when executing thebackgroundWorker1.ReportProgress method.You need to configure the BackgroundWorker component appropriately to prevent the application from generating exceptions. What should yo do？（）
A
Set the Result property of the DoWorkEventArgs instance to True before you attempt to report the progress.
B
Set the CancellationPending property of backgroundWorker1 to True before you attempt to report the background process
C
Set the WorkerReportsProgress property of backgroundWorker1 to True before you attempt to report the background process.
D
Report the progress of the background process in the backgroundWorker1_ProgressChanged event.
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