c# - 跨线程操作无效 : Control 'label1' accessed from a thread other than the thread it was created on-6ren

c# - 跨线程操作无效 : Control 'label1' accessed from a thread other than the thread it was created on

转载作者：行者123 更新时间：2023-11-30 20:04:37

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Possible Duplicate:
Why am I getting this error:“Cross-thread operation not valid: Control lbFolders accessed from a thread other than the thread it was created on.”?

我是 winforms 的新手。在我的代码中，我正在使用 for 循环更新进度条，现在我需要更新循环计数形式的标签，如下所示 -

public partial class Form1 : Form { public Form1() { InitializeComponent();

        Shown += new EventHandler(Form1_Shown);

        // To report progress from the background worker we need to set this property
        backgroundWorker1.WorkerReportsProgress = true;
        // This event will be raised on the worker thread when the worker starts
        backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
        // This event will be raised when we call ReportProgress
        backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    void Form1_Shown(object sender, EventArgs e)
    {
        // Start the background worker
        backgroundWorker1.RunWorkerAsync();
    }


    // On worker thread so do our thing!
    void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        // Your background task goes here
        for (int i = 0; i <= 100; i++)
        {
            label1.Text = "Trade" + i;
            // Report progress to 'UI' thread
            backgroundWorker1.ReportProgress(i);
            // Simulate long task
            System.Threading.Thread.Sleep(100);
        }
    }
    // Back on the 'UI' thread so we can update the progress bar
    void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        // The progress percentage is a property of e
        progressBar1.Value = e.ProgressPercentage;
    }

}