如何解决跨线程操作无效异常? [英] how to solve cross thread operation not valid Exception?

问题描述

我在项目中使用backgroundworker控件显示进度条，并且在backgroundWorker_Dowok事件中遇到跨线程异常.

请帮忙.

这是我的代码:

I''m using backgroundworker control in my project, to show the progress bar, and I am getting cross thread exception in backgroundWorker_Dowok event.

Please help.

Here is my code:

private void btnGenerate_Click(object sender, EventArgs e)
       {

           
           toolStripProgressBar1.Style = ProgressBarStyle.Marquee;
           backgroundWorker1.RunWorkerAsync();
       }
       private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
       {
                   
           bool flag;
            try
            {
             
               clientid = convert.ToString(ddlClientName.SelectedValue); 
               clientid = Convert.ToString(ddlprincipalname.SelectedValue); 
               clid = Convert.ToInt32(ddlClientName.SelectedValue);
               prid = Convert.ToInt32(ddlprincipalname.SelectedValue); 

                   flag = check_op_close_stock();
                   if (flag)
                   {
                       excel_header();
                       get_excel_data();
                       
                       get_nostk_transit();
                       set_formating();
                   }
               }
            
               catch (Exception ex)
               {
                   MessageBox.Show(ex.Message.ToString());
               }
           }

推荐答案

您必须利用InvokeRequired 属性和Control 类的Invoke()方法.

检查此 [

You have to make use of InvokeRequired property and the Invoke()method of a Control class.

Check this[^] article for the details/examples.

那里有大量的文章.请查阅msdn的官方文档:

http://msdn.microsoft.com/en-us/library/ms171728(VS .80).aspx [ ^ ]

您没有发布更新进度条的方法，但是必须在此方法中检查所需的调用.

它应该看起来像这样:

There are tons of articles out there. Check out the official msdn documentation:

http://msdn.microsoft.com/en-us/library/ms171728(VS.80).aspx[^]

You did not post the method that updates the progress bar, but the invoke required must be checked in this method.

It should look something like this:

private void setProgress(int nValue)
{
  if(progressBar.InvokeRequired)
    progressBar.Invoke(new my_delegate(setProgress),new object[]{nValue});
  else
  {    
    progressBar.Value = nValue;
  }
}

private delegate void my_delegate(int nValue);

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