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.";
        }