Question

C#如何在线程中访问控件对象

在线程中我想实现 listView 对象
但弹出错误 不能在线程中访问不是线程创建的对象
我该怎么写?

Thread t = new Thread(new ThreadStart(FindFileInDir));
t.Start();

void FindFileInDir() //遍历目录文件
{
listView2.Items.Add(path);
}

Answer 1

利用ListView.Invoke解决跨线程安全调用，关键代码如下：

void  FindFileInDir( ){
    if( listView2.InvokeRequired)
    {
       // 跨线程调用
       listView2.Invoke(new MethodInvoker(delegate
       {
             listView2.Items.Add(path);
       }));
    }
    else
    {
       //直接调用 
       listView2.Items.Add(path);
    }
} //End of FindFileInDir

Answer 2

在启动线程前边加上 Control.CheckForIllegalCrossThreadCalls = false;就可以了吧，用委托也可以做

Answer 3

//参见这个例子，在线程中访问控件对象，要用到控件的invoke方法

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Threading;

public class MyFormControl : Form
{
public delegate void AddListItem();
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 myItem;
for(int i=1;i<6;i++)
{
myItem = "MyListItem" + i.ToString();
myListBox.Items.Add(myItem);
myListBox.Update();
Thread.Sleep(300);
}
}
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();
}
}

// The following code assumes a 'ListBox' and a 'Button' control are added to a form,
// containing a delegate which encapsulates a method that adds items to the listbox.

public class MyThreadClass
{
MyFormControl myFormControl1;
public MyThreadClass(MyFormControl myForm)
{
myFormControl1 = myForm;
}

public void Run()
{
// Execute the specified delegate on the thread that owns
// 'myFormControl1' control's underlying window handle.
myFormControl1.Invoke(myFormControl1.myDelegate);
}
}

Answer 4

用委托就可以了，参见http://www.cnblogs.com/mokey/articles/2095457.html