线程间操作无效: 从不是创建控件“progressBar1”的线程访问它

http://wangfeng5271.blog.163.com/blog/static/48174444201191910133512/

在窗体 load 加入

private void MailDesktop_Load(object sender, EventArgs e)

{

Control.CheckForIllegalCrossThreadCalls = false;

}

还找了一些其他方法~~

2、创建代理

delegate void SetTextCallback(string text);

创建和启动线程

this.demoThread =

new Thread(new ThreadStart(this.ThreadProcUnsafe));

this.demoThread.Start();

线程中要求改主窗体UI中的text属性

private void ThreadProcSafe()

{

this.SetText("This text was set safely.");

}

调用窗体中的函数用invoke传递参数

private void SetText(string text)

{

if (this.textBox1.InvokeRequired)

{

SetTextCallback d = new SetTextCallback(SetText);

this.Invoke(d, new object[] { text });

}

else

{

this.textBox1.Text = text;

}

}

3、

{

1.定义 委托

delegate void myDelegate(int i);

myDelegate mydelegate = null;

2.定义方法,显示消息

public void ShowMessage(int i)

{

this.textBox1.Text = i.ToString();

this.progressBar1.Value = i;

}

3.定义方法,驱动消息

public void MyEvent()

{

for (int i = 0; i < 100; i++)

{

Thread.Sleep(100);

this.BeginInvoke(mydelegate, new object[] {i});

}

}

4: 运行

private void button1_Click(object sender, EventArgs e)

{

mydelegate = new myDelegate(ShowMessage);

Thread myThread = new Thread(MyEvent);

//IsBackground 是否后台

//这个属性很重要 .如果 Thread IsBackground 等于false

// 当线程还没有结束时，你点了关闭按钮

// 将抛出An unhandled exception

//of type 'System.InvalidOperationException'

//occurred in System.Windows.Forms.dll 异常

myThread.IsBackground = true;

myThread.Start();

}
}