c#怎样用this.Invoke()方法

Question

c#怎样利用this.Invoke()方法,用委托调用带参数的方法？new ParameterizedThreadStart（）除外 。
兄弟帮帮忙。

Answer 1

Invoke一般是用在跨线程调用的时候使用using System;
using System.Drawing;
using System.Windows.Forms;
using System.Threading;   public class MyFormControl : Form
   {
      public delegate void AddListItem(String myString);
      public AddListItem myDelegate;
      private Button myButton;
      private Thread myThread;
      private ListBox myListBox;
      public MyFormControl()
      {
         myButton = new Button();
         myListBox = new ListBox();
         myButton.Location = new Point(72, 160);
         myButton.Size = new Size(152, 32);
         myButton.TabIndex = 1;
         myButton.Text = "Add items in list box";
         myButton.Click += new EventHandler(Button_Click);
         myListBox.Location = new Point(48, 32);
         myListBox.Name = "myListBox";
         myListBox.Size = new Size(200, 95);
         myListBox.TabIndex = 2;
         ClientSize = new Size(292, 273);
         Controls.AddRange(new Control[] {myListBox,myButton});
         Text = " 'Control_Invoke' example ";
         myDelegate = new AddListItem(AddListItemMethod);
      }
      static void Main()
      {
         MyFormControl myForm = new MyFormControl();
         myForm.ShowDialog();
      }
      public void AddListItemMethod(String myString)
      {
            myListBox.Items.Add(myString);
      }
      private void Button_Click(object sender, EventArgs e)
      {
         myThread = new Thread(new ThreadStart(ThreadFunction));
         myThread.Start();
      }
      private void ThreadFunction()
      {
         MyThreadClass myThreadClassObject  = new MyThreadClass(this);
         myThreadClassObject.Run();
      }
   }
   public class MyThreadClass
   {
      MyFormControl myFormControl1;
      public MyThreadClass(MyFormControl myForm)
      {
         myFormControl1 = myForm;
      }
      String myString;      public void Run()
      {
         for (int i = 1; i <= 5; i++)
         {
            myString = "Step number " + i.ToString() + " executed";
            Thread.Sleep(400);
            // Execute the specified delegate on the thread that owns
            // 'myFormControl1' control's underlying window handle with
            // the specified list of arguments.
            myFormControl1.Invoke(myFormControl1.myDelegate,
                                   new Object[] {myString});
         }
      }
   }

Answer 2

Invoke(new A(B), new Object[] { ""});  
http://topic.csdn.net/u/20100704/12/964493ac-547f-4b54-addb-bf014a459bc1.html

Answer 3

this.Invoke((EventHandler)delegate
{
    //随便你调用什么，有没参数都行，委托不用了。直接调用函数即可。当然直接委托也行。
    委托(参数);
});

Answer 4

这个一般是用来保持界面响应速度的，就是使用多线程来防止界面假死。给你个例子using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;namespace PanelSwitch
{
    public  class Form1 : Form
    {        #region 窗体设计
        private System.ComponentModel.IContainer components = null;
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
        private void InitializeComponent()
        {
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.btnStart = new System.Windows.Forms.Button();
            this.btbStop = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(47, 65);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(210, 21);
            this.textBox1.TabIndex = 0;
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(47, 65);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(210, 21);
            this.textBox2.TabIndex = 1;
            this.textBox2.Visible = false;
            // 
            // btnStart
            // 
            this.btnStart.Location = new System.Drawing.Point(100, 133);
            this.btnStart.Name = "btnStart";
            this.btnStart.Size = new System.Drawing.Size(75, 23);
            this.btnStart.TabIndex = 2;
            this.btnStart.Text = "开始";
            this.btnStart.UseVisualStyleBackColor = true;
            this.btnStart.Click += new System.EventHandler(this.btnStart_Click);
            // 
            // btbStop
            // 
            this.btbStop.Location = new System.Drawing.Point(182, 133);
            this.btbStop.Name = "btbStop";
            this.btbStop.Size = new System.Drawing.Size(75, 23);
            this.btbStop.TabIndex = 3;
            this.btbStop.Text = "停止";
            this.btbStop.UseVisualStyleBackColor = true;
            this.btbStop.Click += new System.EventHandler(this.btnStop_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(310, 250);
            this.Controls.Add(this.btbStop);
            this.Controls.Add(this.btnStart);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.textBox1);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.Name = "Form1";
            this.Text = "动态切换";
            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
            this.ResumeLayout(false);
            this.PerformLayout();        }
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.Button btnStart;
        private System.Windows.Forms.Button btbStop;
        #endregion        #region 逻辑代码
        private volatile bool _shouldStop;
        public Form1()
        {
            InitializeComponent();
            _shouldStop = false;
        }
        private void btnStart_Click(object sender, EventArgs e)
        {
            this.textBox1.Visible = true;
            this.textBox2.Visible = false;
            _shouldStop = false;
            Thread getNum = new Thread(new ThreadStart(GetRandomNum));
            getNum.Start();
        }
        public delegate void SetValue(int num);
        private void SetTxtBoxConten(int num)
        {
            this.textBox1.Text = num.ToString();
        }
        private void GetRandomNum()
        {
            while (!_shouldStop)
            {
                Random r = new Random();
                int num = r.Next(1000000, 9999999);
                this.textBox1.Invoke(new SetValue(SetTxtBoxConten), new object[] { num });
                Thread.Sleep(100);
            }
        }
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            _shouldStop = true;
            Environment.Exit(0);
        }
        private void btnStop_Click(object sender, EventArgs e)
        {
            _shouldStop = true;
            this.textBox1.Visible = false;
            this.textBox2.Visible = true;
            this.textBox2.Text = string.Format("你选择了{0}",this.textBox1.Text);
        }
        #endregion        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}