Question

我想要在后台工作程序中运行的代码，但遇到此错误：

“跨线程操作无效：控制'metroComboBox1'从其创建线程以外的线程访问。”

private void metroRename_Click(object sender, EventArgs e)
    {
        if (backgroundWorker1.IsBusy)
            backgroundWorker1.CancelAsync();
        backgroundWorker1.RunWorkerAsync(metroComboBox1.Text);
    }

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        this.Invoke((MethodInvoker)delegate ()
        {
            string text = metroComboBox1.Text;
        });

        if (metroComboBox1.SelectedItem == "TITLE") //error here
        {
           //some code here
        }
    }

如何在后台工作程序中使用组合框？

Answer 1

您也应将条件放在Invoke下，例如

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    this.Invoke((MethodInvoker)delegate ()
    {
        string text = metroComboBox1.Text;
        if (metroComboBox1.SelectedItem == "TITLE") 
        {
           //some code here
        }
    });        
}

Here是关于此问题的现有主题

跨线程操作在后台工作程序C＃中无效

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