C#对Windows窗体控件进行线程安全调用摘自MSDN

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控件名称的线程访问它。”

以下非线程安全的调用的示例。

代码

private void setTextUnsafeBtn_Click(
    object sender,
    EventArgs e)
{
    this.demoThread =
        new Thread(new ThreadStart(this.ThreadProcUnsafe));

    this.demoThread.Start();
}

private void ThreadProcUnsafe()
{
    this.textBox1.Text = "This text was set unsafely.";
}

对 Windows 窗体控件进行线程安全调用

InvokeRequired 属性。
Invoke。
false，则直接调用控件。

Text 属性。

代码

private void setTextSafeBtn_Click(object sender, EventArgs e)
{
    this.demoThread =
        new Thread(new ThreadStart(this.ThreadProcSafe));

    this.demoThread.Start();
}

private void ThreadProcSafe()
{
    this.SetText("This text was set safely.");
}

private void SetText(string text)
{
    if (this.textBox1.InvokeRequired)
    {
        SetTextCallback d = new SetTextCallback(SetText);
        this.Invoke(d, new object[] { text });
    }
    else
    {
        this.textBox1.Text = text;
    }
}

使用 BackgroundWorker 进行线程安全调用

RunWorkerCompleted 事件处理程序调用控件。

使用 BackgroundWorker 进行线程安全调用

不要调用由此方法中的主线程创建的控件。
可以调用由此方法中的主线程创建的控件。
RunWorkerCompleted 事件。
RunWorkerAsync 方法。

RunWorkerCompleted 事件处理程序中直接设置。

代码

private BackgroundWorker backgroundWorker1;
private void setTextBackgroundWorkerBtn_Click(object sender, EventArgs e)
{
    this.backgroundWorker1.RunWorkerAsync();
}
private void backgroundWorker1_RunWorkerCompleted(
    object sender,
    RunWorkerCompletedEventArgs e)
{
    this.textBox1.Text =
        "This text was set safely by BackgroundWorker.";
}

BackgroundWorker。

示例

BackgroundWorker 实现的安全访问。

代码

public class Form1 : Form
{
    delegate void SetTextCallback(string text);
    private Thread demoThread = null;
    private BackgroundWorker backgroundWorker1;

    private TextBox textBox1;
    private Button setTextUnsafeBtn;
    private Button setTextSafeBtn;
    private Button setTextBackgroundWorkerBtn;

    public Form1()
    {
        InitializeComponent();
    }
    private void setTextUnsafeBtn_Click(object sender,EventArgs e)
    {
        this.demoThread =
            new Thread(new ThreadStart(this.ThreadProcUnsafe));

        this.demoThread.Start();
    }

    private void ThreadProcUnsafe()
    {
        this.textBox1.Text = "This text was set unsafely.";
    }

    private void setTextSafeBtn_Click(object sender,EventArgs e)
    {
        this.demoThread =
            new Thread(new ThreadStart(this.ThreadProcSafe));

        this.demoThread.Start();
    }

    private void ThreadProcSafe()
    {
        this.SetText("This text was set safely.");
    }

    private void SetText(string text)
    {
        {
            SetTextCallback d = new SetTextCallback(SetText);
            this.Invoke(d, new object[] { text });
        }
        else
        {
            this.textBox1.Text = text;
        }
    }
    private void setTextBackgroundWorkerBtn_Click(object sender, EventArgs e)
    {
        this.backgroundWorker1.RunWorkerAsync();
    }

    private void backgroundWorker1_RunWorkerCompleted( object sender,RunWorkerCompletedEventArgs e)
    {
        this.textBox1.Text =
            "This text was set safely by BackgroundWorker.";
    }
}

RunWorkerCompleted 事件的处理程序。