在VS 2005 中考慮到線程的安全性，不允許跨線程調(diào)用控件! 為了解決這一問(wèn)題
1. 將Control 的 CheckForIllegalCrossThreadCalls 屬性設(shè)置為假, 不去捕獲錯(cuò)誤線程的調(diào)用，但這種做法是不安全的！
2.使用委托異步調(diào)用
見(jiàn)代碼:
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Windows.Forms;
namespace TabSelect
...{
class MyThread
...{
public delegate void SetLabelText(string text); //定義委托
Control control;
Thread thread;
ThreadStart start;
int num2;
構(gòu)造方法，初始化線程,以及要改變屬性的控件#region 構(gòu)造方法，初始化線程,以及要改變屬性的控件
public MyThread(Control control,int num)
...{
this.control = control;
start = new ThreadStart(BuildNum2); //訂閱線程要執(zhí)行的代碼
this.num2 = num;
thread = new Thread(start);
thread.Start();
}
#endregion
線程中需要執(zhí)行的方法 通過(guò)設(shè)置Control 屬性，指示是否捕獲錯(cuò)誤線程的調(diào)用#region 線程中需要執(zhí)行的方法 通過(guò)設(shè)置Control 屬性，指示是否捕獲錯(cuò)誤線程的調(diào)用
public void BuildNum()
...{
Random random = new Random(num2);
Control.CheckForIllegalCrossThreadCalls = false;
do
...{
int num = random.Next(0, 10);
control.Text = num.ToString();
Thread.Sleep(100);
} while (true);
}
#endregion
方法二，使用委托異步調(diào)用#region 方法二，使用委托異步調(diào)用
public void BuildNum2()
...{
Random myRand = new Random(num2);
while (true)
...{
SetText(myRand.Next(0, 10).ToString());
Thread.Sleep(100);
}
}
#endregion
改變UI 線程的控件屬性#region 改變UI 線程的控件屬性
public void SetText(string str)
...{
if (control.InvokeRequired)
...{
SetLabelText setLableText = new SetLabelText(SetText);
control.Invoke(setLableText, new object[] ...{ str});
}
else
...{
control.Text = str;
}
}
#endregion
public void Kill()
...{
thread.Abort();
}
}
}
界面
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 TabSelect
...{
public partial class Form2 : Form
...{
Point myPoint;
private bool isMouseDown;
private bool isStart = true;
MyThread m;
MyThread m2;
MyThread m3;
public Form2()
...{
InitializeComponent();
}
private void label4_Click(object sender, EventArgs e)
...{
this.Close();
Application.Exit();
}
private void Form2_MouseDown(object sender, MouseEventArgs e)
...{
if (e.Button == MouseButtons.Left)
...{
myPoint = new Point(-e.X,-e.Y);
isMouseDown = true;
}
}
private void Form2_MouseMove(object sender, MouseEventArgs e)
...{
if (isMouseDown == true)
...{
Point newPoint = Control.MousePosition;
newPoint.Offset( myPoint.X,myPoint.Y);
this.Location = newPoint;
}
}
private void Form2_MouseUp(object sender, MouseEventArgs e)
...{
if (e.Button == MouseButtons.Left)
...{
isMouseDown = false;
}
}
private void Form2_Load(object sender, EventArgs e)
...{
}
private void timer1_Tick(object sender, EventArgs e)
...{
Random myRandom = new Random();
label1.Text = myRandom.Next(0, 10).ToString();
}
private void button1_Click(object sender, EventArgs e)
...{
if (isStart == true)
...{
m = new MyThread(label1,1000);
m2 = new MyThread(label2,1111);
m3 = new MyThread(label3, 2222);
isStart = false;
button1.Text = "結(jié)束";
}
else
...{
m.Kill();
m2.Kill();
m3.Kill();
isStart = true;
button1.Text = "開(kāi)始";
}
}
}
}
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