线程间操作无效: 从不是创建控件的线程访问它的三种方法
原文:http://www.cnblogs.com/luckboy/archive/2010/12/19/1910785.html
1、把CheckForIllegalCrossThreadCalls设置为false
2、利用委托
delegate void SetTextCallBack(string text); private void SetText(string text) { if (this.txt_a.InvokeRequired) { SetTextCallBack stcb = new SetTextCallBack(SetText); this.Invoke(stcb , new object[] { text}); } else { this.txt_a.Text = text; } } private void LoadData() { SetText("测试"); } //窗体加载时,用线程加载数据 private void Frm_ImportManager_Load(object sender, EventArgs e) { ThreadStart ts = new ThreadStart(LoadData); Thread thread = new Thread(ts); thread.Name = "LoadData"; thread.Start(); }
3、使用 BackgroundWorker控件
在应用程序中实现多线程的首选方式是使用 BackgroundWorker 组件。BackgroundWorker 组件使用事件驱动模型实现多线程。辅助线程运行 DoWork 事件处理程序,创建控件的线程运行 ProgressChanged 和 RunWorkerCompleted 事件处理程序。注意不要从 DoWork 事件处理程序调用您的任何控件。
下面的代码示例不异步执行任何工作,因此没有 DoWork 事件处理程序的实现。TextBox 控件的 Text 属性在 RunWorkerCompleted 事件处理程序中直接设置。
// This event handler starts the form‘s // BackgroundWorker by calling RunWorkerAsync. // // The Text property of the TextBox control is set // when the BackgroundWorker raises the RunWorkerCompleted // event. private void setTextBackgroundWorkerBtn_Click( object sender, EventArgs e) { this.backgroundWorker1.RunWorkerAsync(); } // This event handler sets the Text property of the TextBox // control. It is called on the thread that created the // TextBox control, so the call is thread-safe. // // BackgroundWorker is the preferred way to perform asynchronous // operations. private void backgroundWorker1_RunWorkerCompleted( object sender, RunWorkerCompletedEventArgs e) { this.textBox1.Text = "This text was set safely by BackgroundWorker."; }
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