最近專案中又需要客製化一些控制元件，draw來draw去真的好煩，其中有ListBox客製化並居中顯示字型，特記錄下供各位以備不時，比較簡單，禁止拍磚哈~~~

首先將Listbox的DrawMode屬性設定為DrawMode.OwnerDrawVariable

載入事件DrawItem和MeasureItem，如不加入MeasureItem事件，則Item會使用預設高度重繪，字型顯示不完全，各位可以自己嘗試一下

ListBox _listBox = new ListBox();
_listBox.DrawMode = DrawMode.OwnerDrawVariable;
_listBox.DrawItem += _listBox_DrawItem;
_listBox.MeasureItem += _listBox_MeasureItem;

// set listbox item height
        void _listBox_MeasureItem(object sender, MeasureItemEventArgs e)
        {
            e.ItemHeight = 30;
        }


        // make the item text center aligned 
        void _listBox_DrawItem(object sender, DrawItemEventArgs e)
        {
            e.DrawBackground();
            e.DrawFocusRectangle();


            System.Drawing.StringFormat strFmt = new System.Drawing.StringFormat(System.Drawing.StringFormatFlags.NoClip);
            strFmt.Alignment = System.Drawing.StringAlignment.Center;


            RectangleF rf = new RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);


            //You can also use DrawImage to add some customized image before or after text string， of course backgroud image


            e.Graphics.DrawString(this.Items[e.Index].ToString(), e.Font, new System.Drawing.SolidBrush(e.ForeColor), rf, strFmt);
        }