System.argumentoutofrangeexception而調用Listviewitems使用迭代

Question

我有必須含有大量和連續地進入列表視圖控件中的項的應用程序：

public Form1() 
    { 
     InitializeComponent(); 
    } 

    private void button1_Click(object sender, EventArgs e) 
    { 
     deg_loadfile load = new deg_loadfile(loadfile); 
     load.BeginInvoke(new AsyncCallback(loadcallback),null); 
    } 

    void countfile() { 

     int listcount = listView1.Items.Count;   
     for (int x = 0; x < listcount; x++) { 

      listView1.BeginInvoke((MethodInvoker)delegate { 
       listView1.Items[x].SubItems[1].Text = "ok"; 
       listView1.Items[x].SubItems[2].Text = "ok"; 
       listView1.Items[x].SubItems[3].Text = "done"; 
      },x); 

     } 

    } 
    void countcallback(IAsyncResult ae) { 
     MessageBox.Show("count finished"); 

    } 
    delegate void deg_count(); 

    void loadcallback(IAsyncResult ae) { 
     MessageBox.Show("finished"); 

    } 
    delegate void deg_loadfile(); 
    void loadfile() { 

     string file = File.ReadAllText("hughlist.txt"); 
     string[] files = Regex.Split(file,"\n"); 

     foreach (string str in files) { 
      listView1.BeginInvoke((MethodInvoker)delegate { 
       ListViewItem item = new ListViewItem(str); 
       item.SubItems.Add(""); 
       item.SubItems.Add(""); 
       item.SubItems.Add(""); 
       listView1.Items.Add(item);     
      },str);   
     } 
    } 

    private void button2_Click(object sender, EventArgs e) 
    { 
     deg_count count = new deg_count(countfile); 
     count.BeginInvoke(new AsyncCallback(countcallback),null); 

    } 

上面的代碼拋出system.argumentoutofrangeexception（請參見下圖）

鏈接圖像：http://i.stack.imgur.com/WJ7sA.png

迭代已經超過了我所給出的條件下，爲什麼會發生（注：在我的情況，我必須用「爲」而不是「的foreach」或其他枚舉）？

THX

UPDATE： THX到@saruman的答案（關鍵字是 「進入修改封」），我已經更新的代碼如下

for (int x = 0; x < listcount; x++) { 
      var x1=x; 
      listView1.BeginInvoke((MethodInvoker)delegate 
      { 
       listView1.Items[x1].SubItems[1].Text = "ok"; 
       listView1.Items[x1].SubItems[2].Text = "ok"; 
       listView1.Items[x1].SubItems[3].Text = "done"; 
      }, x1); } 

Answer 1

查找訪問改性封閉

試試這個

var listcount = listView1.Items.Count; 
for (var x = 0; x < listcount; x++) 
{ 
    var x1 = x; 
    listView1.BeginInvoke((MethodInvoker)delegate 
    { 
     listView1.Items[x1].SubItems[1].Text = "ok"; 
     listView1.Items[x1].SubItems[2].Text = "ok"; 
     listView1.Items[x1].SubItems[3].Text = "done"; 
    }); 
}