从班级的BackgroundWorker更新进度栏

Question

I am trying to update progress bar from the class that does the copying

In the my copy class I have

public event EventHandler Copy_OnProgressChange;

private void CopyWorker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
        {
            EventHandler handler = Copy_OnProgressChange;
            if (handler != null) handler(this, e);
        }

And in the main class

CopyList[i].Copy_OnProgressChange += CopyProgressMessage;

    void CopyProgressMessage(object sender, EventArgs e)
    {
      //update progressBar with percentage
    }

As you can see I can not pass percentage from ProgressChangedEventArgs to eventhandler. Is there an easy way to fix this?

Answer 1

您应该将事件更改为EventHandler<ProgressChangedEventArgs> ，以便它将传递带有progress属性的派生类型。

Answer 2

It doesn't look like your event handler isn't structured correctly... It requires the second argument to be: ProgressChangedEventArgs instead of EventArgs...

ProgressChangedEventArgs has a property named: ProgressPercentage .