Control.Invoke 方法 (Delegate)
在拥有此控件的基础窗口句柄的线程上执行指定的委托。
Invoke方法搜索沿控件的父级链，直到它找到的控件或窗口具有一个窗口句柄；
如果尚不存在当前控件的基础窗口句柄，或者找不到任何合适的句柄，Invoke方法
将会引发异常。
例子
public class MyFormControl : Form
{
public delegate void AddListItem();
public AddListItem myDelegate;
private Thread myThread;
private ListBox myListBox;
public MyFormControl()
{
var 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);
}
public void AddListItemMethod()
{
String myItem;
for (int i = 1; i < 6; i++)
{
myItem = "MyListItem" + i.ToString();
myListBox.Items.Add(myItem);
myListBox.Update();
Thread.Sleep(3000);
}
}
private void Button_Click(object sender, EventArgs e)
{
myThread = new Thread(new ThreadStart(ThreadFunctionRight));
myThread.Start();
}
}
关键
private void ThreadFunctionWrong()
{
//if direct call myDelegate(), it would throw an exception
myDelegate();
}
private void ThreadFunctionRight()
{
//right way: must run at thead that creates myListBox control.
// Execute the specified delegate on the thread that owns
// 'myListBox' control's underlying window handle.
this.Invoke(this.myDelegate);
}