C# Winform 跨线程更新UI控件常用方法汇总 - marshal-m - 博客园

        //共分三步
        //第一步：获取UI线程同步上下文（在窗体构造函数或FormLoad事件中）
        /// <summary>
        /// UI线程的同步上下文
        /// </summary>
        SynchronizationContext m_SyncContext = null;
        public Form1()
        {
            InitializeComponent();
            //获取UI线程同步上下文
            m_SyncContext = SynchronizationContext.Current;
            //Control.CheckForIllegalCrossThreadCalls = false;
        }
        //第二步：定义线程的主体方法
        /// <summary>
        /// 线程的主体方法
        /// </summary>
        private void ThreadProcSafePost()
        {
            //...执行线程任务

            //在线程中更新UI（通过UI线程同步上下文m_SyncContext）
            m_SyncContext.Post(SetTextSafePost, "This text was set safely by SynchronizationContext-Post.");

            //...执行线程其他任务
        }
        //第三步：定义更新UI控件的方法
        /// <summary>
        /// 更新文本框内容的方法
        /// </summary>
        /// <param name="text"></param>
        private void SetTextSafePost(object text)
        {
            this.textBox1.Text = text.ToString();
        }
        //之后,启动线程
        /// <summary>
        /// 启动线程按钮事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void setSafePostBtn_Click(object sender, EventArgs e)
        {
            this.demoThread = new Thread(new ThreadStart(this.ThreadProcSafePost));
            this.demoThread.Start();
        }

        // 共分三步

        // 第一步：定义委托类型
        // 将text更新的界面控件的委托类型
        delegate void SetTextCallback(string text);

        //第二步：定义线程的主体方法
        /// <summary>
        /// 线程的主体方法
        /// </summary>
        private void ThreadProcSafe()
        {
            //...执行线程任务

            //在线程中更新UI（通过控件的.Invoke方法）
            this.SetText("This text was set safely.");

            //...执行线程其他任务
        }
        //第三步：定义更新UI控件的方法
        /// <summary>
        /// 更新文本框内容的方法
        /// </summary>
        /// <param name="text"></param>
        private void SetText(string text)
        {
            // InvokeRequired required compares the thread ID of the 
            // calling thread to the thread ID of the creating thread. 
            // If these threads are different, it returns true. 
            if (this.textBox1.InvokeRequired)//如果调用控件的线程和创建创建控件的线程不是同一个则为True
            {
                while (!this.textBox1.IsHandleCreated)
                {
                    //解决窗体关闭时出现“访问已释放句柄“的异常
                    if (this.textBox1.Disposing || this.textBox1.IsDisposed)
                        return;
                }
                SetTextCallback d = new SetTextCallback(SetText);
                this.textBox1.Invoke(d, new object[] { text });
            }
            else
            {
                this.textBox1.Text = text;
            }
        }
        //之后,启动线程
        /// <summary>
        /// 启动线程按钮事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void setTextSafeBtn_Click(
            object sender,
            EventArgs e)
        {
            this.demoThread =
                new Thread(new ThreadStart(this.ThreadProcSafe));

            this.demoThread.Start();
        }

        //共分三步

        //第一步：定义BackgroundWorker对象，并注册事件（执行线程主体、执行UI更新事件）
        private BackgroundWorker backgroundWorker1 =null;
        public Form1()
        {
            InitializeComponent();

           
            backgroundWorker1 = new System.ComponentModel.BackgroundWorker();
            //设置报告进度更新
            backgroundWorker1.WorkerReportsProgress = true;
            //注册线程主体方法
            backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
            //注册更新UI方法
            backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
            //backgroundWorker1.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(this.backgroundWorker1_RunWorkerCompleted);
        }

        //第二步：定义执行线程主体事件
        //线程主体方法
        public void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            //...执行线程任务

            //在线程中更新UI（通过ReportProgress方法）
            backgroundWorker1.ReportProgress(50, "This text was set safely by BackgroundWorker.");

            //...执行线程其他任务
        }
        //第三步：定义执行UI更新事件
        //UI更新方法
        public void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.textBox1.Text = e.UserState.ToString();
        }
        //之后，启动线程
        //启动backgroundWorker
        private void setTextBackgroundWorkerBtn_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.RunWorkerAsync();
        }

      public Form1()
        {
            InitializeComponent();
            //指定不再捕获对错误线程的调用
            Control.CheckForIllegalCrossThreadCalls = false;
        }

        //
        // 摘要:
        //     获取或设置一个值，该值指示是否捕获对错误线程的调用，这些调用在调试应用程序时访问控件的 System.Windows.Forms.Control.Handle
        //     属性。
        //
        // 返回结果:
        //     如果捕获了对错误线程的调用，则为 true；否则为 false。
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        [SRDescription("ControlCheckForIllegalCrossThreadCalls")]
        [Browsable(false)]
        public static bool CheckForIllegalCrossThreadCalls { get; set; }