线程间操作无效：从不是创建控件“XX”的线程访问它
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;
namespace PrimeTest
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private Thread primeThread;
private System.Windows.Forms.ListBox lstPrime;
private System.Windows.Forms.Button btnStart;
private System.Windows.Forms.Button btnPause;
private System.Windows.Forms.Button btnResume;
private System.Windows.Forms.Button btnStop;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.lstPrime = new System.Windows.Forms.ListBox();
this.btnStart = new System.Windows.Forms.Button();
this.btnPause = new System.Windows.Forms.Button();
this.btnResume = new System.Windows.Forms.Button();
this.btnStop = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// lstPrime
//
this.lstPrime.ItemHeight = 12;
this.lstPrime.Location = new System.Drawing.Point(8, 16);
this.lstPrime.Name = "lstPrime ";
this.lstPrime.Size = new System.Drawing.Size(336, 160);
this.lstPrime.TabIndex = 0;
//
// btnStart
//
this.btnStart.Location = new System.Drawing.Point(8, 192);
this.btnStart.Name = "btnStart ";
this.btnStart.TabIndex = 1;
this.btnStart.Text = "开始(&S) ";
this.btnStart.Click += new System.EventHandler(this.btnStart_Click);
//
// btnPause
//
this.btnPause.Location = new System.Drawing.Point(96, 192);
this.btnPause.Name = "btnPause ";
this.btnPause.TabIndex = 2;
this.btnPause.Text = "暂停(&P) ";
this.btnPause.Click += new System.EventHandler(this.btnPause_Click);
//
// btnResume
//
this.btnResume.Location = new System.Drawing.Point(177, 192);
this.btnResume.Name = "btnResume ";
this.btnResume.TabIndex = 3;
this.btnResume.Text = "恢复(&R) ";
this.btnResume.Click += new System.EventHandler(this.btnResume_Click);
//
// btnStop
//
this.btnStop.Location = new System.Drawing.Point(264, 192);
this.btnStop.Name = "btnStop ";
this.btnStop.TabIndex = 4;
this.btnStop.Text = "停止(&O) ";
this.btnStop.Click += new System.EventHandler(this.btnStop_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(352, 237);
this.Controls.Add(this.btnStop);
this.Controls.Add(this.btnResume);
this.Controls.Add(this.btnPause);
this.Controls.Add(this.btnStart);
this.Controls.Add(this.lstPrime);
this.Name = "Form1 ";
this.Text = "Form1 ";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void btnStart_Click(object sender, System.EventArgs e)
{
//新线程
primeThread = new Thread(new ThreadStart(Generate));
//线程名
primeThread.Name = "质数 ";
btnPause.Enabled = true;
btnStart.Enabled = false;
btnStop.Enabled = true;
primeThread.Start();
}
private void Form1_Load(object sender, System.EventArgs e)
{
btnPause.Enabled = false;
btnStop.Enabled = false;
btnResume.Enabled = false;
}
public void Generate()
{
//CheckForIllegalCrossThreadCalls
// true = 质数; false = 非质数
bool IsPrime = true;
int count = 2;
//由于第一个质数是2,因此将它添加到列表中
// Thread.CurrentThread.Name = "test ";
lstPrime.Items.Add(2);
//执行循环直到生成另外24个质数
for(int i = 3; count < 50; i += 2)
{
IsPrime = true;
for (int j = 2; j <= (i /2); j++)
{
//检查 "i "是否 可以被整除
if(i % j == 0)
{
IsPrime = false;
break;
}
}
// 显示质数并递增计数器
lock(this)
{
if(IsPrime)
{
lstPrime.Items.Add(i);
count++;
//使线程休眠100毫秒,以启用线程的暂停和恢复
Thread.Sleep(100);
}
}
}
//线程完成后,启用和禁用这些按
this.btnStart.Enabled = true;
btnPause.Enabled = false;
btnStop.Enabled = false;
btnResume.Enabled = false;
}
private void btnPause_Click(object sender, System.EventArgs e)
{
try
{
if(primeThread.ThreadState == ThreadState.Running
|| primeThread.ThreadState == ThreadState.WaitSleepJoin)
{
primeThread.Suspend();
btnPause.Enabled = false;
btnResume.Enabled = true;
btnStop.Enabled = false;
}
}
catch(ThreadStateException ce)
{
MessageBox.Show(ce.ToString(), "异常 ");
}
}
private void btnStop_Click(object sender, System.EventArgs e)
{
btnStop.Enabled = false;
btnStart.Enabled = true;
btnPause.Enabled = false;
primeThread.Abort();
}
private void btnResume_Click(object sender, System.EventArgs e)
{
if(primeThread.ThreadState == ThreadState.Stopped
|| primeThread.ThreadState == ThreadState.SuspendRequested
|| primeThread.ThreadState == ThreadState.WaitSleepJoin
|| Convert.ToInt32(primeThread.ThreadState) == 96)
{
try
{
primeThread.Resume();
btnResume.Enabled = false;
btnPause.Enabled = true;
btnStop.Enabled = true;
}
catch(ThreadStateException ce)
{
MessageBox.Show(ce.ToString(), "异常 ");
}
}
}
}
}
听网友说：
Control.CheckForIllegalCrossThreadCalls = false;
可是不知在哪里设置，“点”不出来,急啊
[解决办法]
可以在构造函数里设置..
this.CheckForIllegalCrossThreadCalls =false;
[解决办法]
把this.CheckForIllegalCrossThreadCalls =false;
放在
Form1_Load函数里
[解决办法]
最好的办法是用委托...
你出现这个问题主要是因为你在线程方法中操作了界面上的控件..lstPrime.Items.Add()
可以这样改下..
//定义一个委托
public delegate void MyInvoke(string str);
//定义一个操作界面的方法
private void UpdateUI(string str)
{
//增加项
this.lstPrime.Items.Add(str);
}
//在线程的方法中,即你的Generate方法..
//里面只要是涉及到Items.Add操作的都改成如下形式即可..
//比如lstPrime.Items.Add(2);改成:
MyInvoke mi=new MyInvoke(UpdateUI);
this.BeginInvoke(mi,new object[]{ "2 "});