如何在CheckedBoxList控件中对项绘制字符串？

Question

我试图在CheckedListBox控件中绘制或更改项的字符串。因此，我创建了来自CheckedListBox的自定义控件。

public class CheckedListBoxAdv : CheckedListBox
{
    public CheckedListBoxAdv()
        :base()
    { 
    }

    protected override void OnDrawItem(DrawItemEventArgs e)
    {
         base.OnDrawItem(e);
        //I want to change the text alone this place. But I cannot access the text part of the item.

    }        
}

有什么办法单独修改文本吗？

Answer 1

你不需要任何绘画。可以创建包含Item和Name属性的类，然后重写类的ToString()方法以返回需要在CheckedListBox中显示的内容。

public class Item
{
    public int Value { get; set; }
    public string Name { get; set; }
    public override string ToString()
    {
        return this.Name;
    }
}

这样，您就可以用项目填充CheckedListBox。它显示了Name属性，但您也可以访问Value属性：

private void Form1_Load(object sender, EventArgs e)
{
    this.checkedListBox1.Items.Clear();

    this.checkedListBox1.Items.Add(new Item() { Value = 1, Name = "One" });
    this.checkedListBox1.Items.Add(new Item() { Value = 2, Name = "two" });
    this.checkedListBox1.Items.Add(new Item() { Value = 3, Name = "three" });

    //Change the Name of item at index 1 (2,"two")
    ((Item)this.checkedListBox1.Items[1]).Name = "Some Text";

    //But the value is untouched
    MessageBox.Show(((Item)this.checkedListBox1.Items[1]).Value.ToString());

}

Answer 2

试试this.checkedListBoxName.Items：checkedListBoxName是checkedListBox的名称

例：this.checkedListBoxName.Items[0] = "abc";