查看各种大佬写的，唯有这个最称心满意【https://blog.csdn.net/weixin_30493321/article/details/96922723】 鉴于微软自带的DropDownList并没有可输入这个功能，所以找到了这个完美的方案，代码又简洁。 html:
<input list="browsers"> <datalist id="browsers"> <%=selectHtml %> </datalist>aspx.cs
string sql_new = string.Format(@"SELECT id,activity_name,quan_property FROM dbo.tb_activity_bizhong_10289 where quanCreateType=0"); var dt1 = SQL.GetDataTable(sql_new); if (dt1 != null) { //Bind.AddItem(this.tb_activity_bizhong_id, new string[] { " ", "-1" }); if (dt1.Rows.Count > 0) { for (int i = 0; i < dt1.Rows.Count; i++) { DataRow dr = dt1.Rows[i]; if (dr["quan_property"].ToString()=="1") { selectHtml += "<option value=" + "【金额】" + dr["activity_name"] + ">"; } if (dr["quan_property"].ToString() == "2") { selectHtml += "<option value=" + "【数量】" + dr["activity_name"] + ">"; } if (dr["quan_property"].ToString() == "5" || dr["quan_property"].ToString() == "6") { selectHtml += "<option value=" + "【定量】" + dr["activity_name"] + ">"; } } } } 输入的效果 不输入的效果