c# – 为什么我用BackgroundWorker.ReportProgress获取TargetInv

在我的“DoWork”中,我想通过“backgroundworker.ReportProgress(some int)”来报告进度.但是当我的程序调用“backgroundworker.ReportProgress(some int)”时,我得到一个“System.Reflection.TargetInvocationException”.

我该如何解决我的问题？

private void btnGrap_Click(object sender,EventArgs e)
    {
        //some code
        ListsObject listsObject = new ListsObject(filePaths,enumList);
        progressBar1.Maximum = 100;//count;
        this.bgrndWorkerSearchMatches.RunWorkerAsync(listsObject);
     }

_做工作：

private void backgroundWorkerSearchMatches_DoWork(object sender,DoWorkEventArgs e)
    {
        for (int i = 0; i < 100; i++)
        {
            bgrndWorkerSearchMatches.ReportProgress(i);
        }
     }

_ProcessChanged：

private void bgrndWorkerSearchMatches_ProgressChanged(object sender,ProgressChangedEventArgs e)
    {
        //progressBar1.Value = e.ProgressPercentage;
    }

我找到了答案：

我用Visual Studio创建了backgroundworker eventhandler,并且不知道我必须手动设置：

bgrndWorkerSearchMatches.WorkerReportsProgress = true;