C# 多线程，解决处理大数据时窗体（不能拖动等）假死现象

using System.Threading;//引入命名空间

public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }
        // 第一种方法：
        delegate void MyDel(int i);//此处定义委托应与方法HH的原型一致
        MyDel mydel = null;
        private void button1_Click(object sender, EventArgs e)
        {
            mydel = new MyDel(HH);
            Thread h = new Thread(new ThreadStart(World));
            h.IsBackground = true;
            h.Start();

        }
        void HH(int j)
        {
            #region 错误方法
            //for (int i = 0; i <= j; i++)
            //{
            //    Thread.Sleep(100);
            //    this.progressBar1.Value = i;
            //    if (i == 100)
            //    {
            //        if(DialogResult.OK== MessageBox.Show("成功","测试",MessageBoxButtons.OKCancel,MessageBoxIcon.Question))
            //        {
            //            this.Close();
            //        }
            //    }
            //}
            #endregion
            this.progressBar1.Value = j;
            this.label1.Text = "当前已完成" + j.ToString() + "%,请稍等……";
            if (j == 100)
            {
                this.Invoke(new MethodInvoker(delegate() { this.label1.Text = "完成"; }));
                if (DialogResult.OK == MessageBox.Show("成功2", "测试2", MessageBoxButtons.OKCancel, MessageBoxIcon.Question))
                {
                    this.Close();
                }
            }

        }
        void World()
        {
            mydel = new MyDel(HH);
            for (int i = 0; i <= 100; i++)
            {
                Thread.Sleep(100);
                BeginInvoke(mydel, new object[] { i });
            }

        }

        //第二种方法
        private void button2_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(new ThreadStart(MessageShow));
            t.IsBackground = true;
            t.Start();
        }
        void MessageShow()
        {
            for (int i = 0; i <= 100; i++)
            {
                Thread.Sleep(100);
                this.Invoke(new MethodInvoker(delegate() { this.label3.Text = "当前已完成" + i + "%,请稍等……"; }));

                if (i == 100)
                {
                    this.Invoke(new MethodInvoker(delegate()
                    {
                        this.label3.Text = "完成";
                        if (DialogResult.OK == MessageBox.Show("完成1", "完成1", MessageBoxButtons.OKCancel, MessageBoxIcon.Question))
                        {
                            this.Close();
                        }
                        else
                        {
                        }
                    }));
                }
                this.Invoke(new MethodInvoker(delegate() { this.progressBar2.Value = i; }));
            }
        }
      
        //第三种方法
        private void button3_Click(object sender, EventArgs e)
        {
            Thread th = new Thread(new ParameterizedThreadStart(GetPath));
            th.IsBackground = true;
            th.Start("100");
        }
        void GetPath(object str)
        {
            int j = int.Parse(str.ToString());
            for (int i = 0; i <= j; i++)
            {
                Thread.Sleep(100);
                this.Invoke(new MethodInvoker(delegate() { this.progressBar3.Value = i; }));
                this.Invoke(new MethodInvoker(delegate() { this.label2.Text = "当前已完成" + i.ToString() + "%,请稍等……"; }));
                if (i == 100)
                {
                    this.Invoke(new MethodInvoker(delegate() { this.label2.Text = "完成" ; }));
                    if (DialogResult.OK == MessageBox.Show("成功3", "测试3", MessageBoxButtons.OKCancel, MessageBoxIcon.Question))
                    {
                        this.Close();
                    }
                }
            }
        }//此方法必须是Object类型的参数

    }
}

 

 

另外说明：

 

在多线程程序中，新创建的线程不能访问UI线程创建的窗口控件，如果需要访问窗口中的控件，可以在窗口构造函数中将CheckForIllegalCrossThreadCalls设置为 false

public Form1() {    

InitializeComponent();   

  CheckForIllegalCrossThreadCalls = false;

}

 

也可以针对某一控件进行设置，例如：

    TextBox.CheckForIllegalCrossThreadCalls = false;