1

//这是我的代码 

private void btnGenSumm_Click(object sender, EventArgs e)
{
    if (backgroundWorker1.IsBusy != true)
    {
        btnGenSumm.Enabled = false;
        btnExpSum.Enabled = false;
        btnClose.Enabled = false;
        pBox1.Visible = true;
        backgroundWorker1.RunWorkerAsync();
    }
}

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
        BackgroundWorker worker = sender as BackgroundWorker;
        loadSummSales(); // this is the process
        System.Threading.Thread.Sleep(50);
}

private void backgroundWorker1_RunWorkerCompleted(object sender, 
    RunWorkerCompletedEventArgs e)
{
        pBox1.Visible = false;
}

第一次单击时执行该过程没有错误，但是当我尝试再次单击命令按钮（btnGenSumm）以重复该过程时，出现错误“在执行 createhandle 时无法调用值处理”。请帮助我有了这个。

4

1 回答 1

0

在开始一项任务之前，我总是会创建一个新的工人；这避免了这些问题。

private void btnGenSumm_Click(object sender, EventArgs e)
{
    // WorkerFactory creates your worker and hooks up the DoWork 
    // and RunWorkerCompleted events
    var backgroundWorker1 = WorkerFactory();

    // ...
    // Disable access to this Click event in the UI here

    backgroundWorker1.RunWorkerAsync();
}

private void backgroundWorker1_RunWorkerCompleted(
    object sender, 
    RunWorkerCompletedEventArgs e)
{
    // Re-enable access to the Click event in the UI here
}

使用这种方法，无法在工作人员运行时访问它，并且您可以保证每当用户单击按钮时，最后一个工作人员已经完成并且没有令人讨厌的IsBusy软糖。

更新

明确WorkerFactory地做这样的事情

private BackgroundWorker WorkerFactory()
{
    var worker = new BackgroundWorker();
    worker.DoWork += backgroundWorker1_DoWork;
    worker.RunWorkerCompleted += backgroundWorker1_RunWorkerCompleted;

    return worker;
}
于 2013-04-12T07:59:39.787 回答