关键代码：

        public static void AddDeleteButton(this LookUpEdit lue, string prompttext)        {            prompttext = string.IsNullOrEmpty(prompttext) ? "删除选中项" : prompttext;            lue.Properties.Buttons.AddRange(new EditorButton[]             {                   new EditorButton(                    ButtonPredefines.Delete,                    "删除", -1, true, true, false, ImageLocation.MiddleCenter,                     null,                     new KeyShortcut(Keys.Delete),                    new SerializableAppearanceObject(),                    prompttext,                     "Delete",                    null,                    true)             });            lue.ButtonClick += new ButtonPressedEventHandler(lue_ButtonClick);        }        static void lue_ButtonClick(object sender, ButtonPressedEventArgs e)        {            if (e.Button.Kind == ButtonPredefines.Delete)            {                LookUpEdit _curLue = sender as LookUpEdit;                _curLue.EditValue = http://www.mamicode.com/null;            }        }

使用示例：

            this.lookUpEdit1.BindWithAutoCompletion(PersonList, "Name", "Name", "输入需要搜索的....");            this.lookUpEdit1.AddDeleteButton("删除选中数据....");

<style type="text/css">.csharpcode, .csharpcode pre{ font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/}.csharpcode pre { margin: 0em; }.csharpcode .rem { color: #008000; }.csharpcode .kwrd { color: #0000ff; }.csharpcode .str { color: #006080; }.csharpcode .op { color: #0000c0; }.csharpcode .preproc { color: #cc6633; }.csharpcode .asp { background-color: #ffff00; }.csharpcode .html { color: #800000; }.csharpcode .attr { color: #ff0000; }.csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em;}.csharpcode .lnum { color: #606060; }</style>使用效果：

希望有所帮助！

[DevExpress]为LookUpEdit添加删除按钮