复制代码 代码如下:
class ColorComboBox : ComboBox
{
/// <summary>
/// 当前选中色
/// </summary>
public Color SelectedColor
{
get { return Color.FromName(this.Text); }
}
/// <summary>
/// 构造函数，构造颜色下拉列表
/// </summary>
public ColorComboBox()
{
this.DrawMode = DrawMode.OwnerDrawFixed;
this.DropDownStyle = ComboBoxStyle.DropDownList;
this.ItemHeight = 25;

PropertyInfo[] propInfoList = typeof(Color).GetProperties(BindingFlags.Static | BindingFlags.DeclaredOnly | BindingFlags.Public);
foreach (PropertyInfo c in propInfoList)
{
this.Items.Add(c.Name);
}
this.Text = "Black"; //设置默认色
}

protected override void OnDrawItem(DrawItemEventArgs e)
{
Rectangle rect = e.Bounds;

if (e.Index >= 0)
{
string colorName = this.Items[e.Index].ToString();
Color c = Color.FromName(colorName);
using (Brush b = new SolidBrush(c)) //预留下拉项间距
{
e.Graphics.FillRectangle(b, rect.X, rect.Y + 2, rect.Width, rect.Height - 4);
}
}
}