C＃跨线程操作无效 [英] C# Cross-thread operation not valid

问题描述

可能重复：结果
的跨线程操作无效：从不是线程以外的线程访问控制上创建它的

我得到一个错误信息 - 任何人都可以给我一些指点。

跨线程操作无效：控制'pbx_1从比它创建的线程以外的
线程访问

我已经对这里看看，但我似乎无法得到它的工作。我很新的C＃，所以我可能失去了一些东西。

  Console.WriteLine（backgroundWorker1）; 
而（backgroundWorker1.CancellationPending！）{
 Thread.sleep代码（100）; 
如果（pbx_1.Location.X< Click_X）{
 pbx_1.Location =新的点（20，pbx_1.Location.X + MoveAmt）; 
} 
 
如果（pbx_1.Location.X> Click_X）{
 pbx_1.Location =新的点（20，pbx_1.Location.X  -  MoveAmt）; 
} 
 
 backgroundWorker1.ReportProgress（1）; 
} 
  

解决方案

您应该调用 backgroundWorker1.ReportProgress（1）; ，因为只有UI线程可以直接访问UI控件。调用示例：

 私人委托无效AddListBoxItemDelegate（对象的项目）; 
 
私人无效AddListBoxItem（对象的项目）
 {
如果（this.listBox1.InvokeRequired）
 {
 //这是一个工作线程，以便委托任务。 
 this.listBox1.Invoke（新AddListBoxItemDelegate（this.AddListBoxItem）项）; 
} 
，否则
 {
 //这是UI线程，以便执行任务。 
 this.listBox1.Items.Add（项目）; 
} 
} 
  

Possible Duplicate:
Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on.

I get an error message - can anyone give me some pointers.

Cross-thread operation not valid: Control 'pbx_1' accessed from a thread other than the thread it was created on.

I have had a look on here but i cant seem to get it to work. I am quite new to c# so I am probably missing something.

 Console.WriteLine("backgroundWorker1");
 while (!backgroundWorker1.CancellationPending) {
     Thread.Sleep(100);
     if (pbx_1.Location.X < Click_X) {
         pbx_1.Location = new Point(20, pbx_1.Location.X + MoveAmt);
     }

     if (pbx_1.Location.X > Click_X) {
         pbx_1.Location = new Point(20, pbx_1.Location.X - MoveAmt);
     }

     backgroundWorker1.ReportProgress(1);
 }

解决方案

You should Invoke backgroundWorker1.ReportProgress(1);, because only UI thread can directly access UI controls. Example of invoking:

private delegate void AddListBoxItemDelegate(object item);

private void AddListBoxItem(object item)
{
   if (this.listBox1.InvokeRequired)
   {
       // This is a worker thread so delegate the task.
       this.listBox1.Invoke(new AddListBoxItemDelegate(this.AddListBoxItem), item);
   }
   else
   {
       // This is the UI thread so perform the task.
       this.listBox1.Items.Add(item);
   }
}

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