帶重寫列表框CreateParams不會引發項目事件

Question

我創建了一個自定義列表框，如here。 問題是它沒有引發像DrawItem和SelectedIndexChanged這樣的項目特定事件。

任何想法爲什麼？ 謝謝。

Answer 1

它工作得很好，當我試圖驗證碼：

public partial class Form1 : Form { 
    MyListBox mList; 
    public Form1() { 
     InitializeComponent(); 
    } 

    protected override void OnLoad(EventArgs e) { 
     mList = new MyListBox(this); 
     mList.Location = new Point(5, 10); 
     mList.Size = new Size(50, this.ClientSize.Height + 50); 
     for (int ix = 0; ix < 100; ++ix) mList.Items.Add(ix); 
     mList.SelectedIndexChanged += new EventHandler(mList_SelectedIndexChanged); 
    } 

    void mList_SelectedIndexChanged(object sender, EventArgs e) { 
     MessageBox.Show(mList.SelectedIndex.ToString()); 
    } 

    protected override void Dispose(bool disposing) { 
     // Moved from Designer.cs file 
     if (disposing) mList.Dispose(); 
     if (disposing && (components != null)) { 
     components.Dispose(); 
     } 
     base.Dispose(disposing); 
    } 

    }