给DropDownList添加ToolTip(title)属性@慕课网原创_慕课网

刚才一位网友在SKYPE问及，如何给asp.net的DropDownList控件添加ToolTip(title)属性。
Insus.NET回复他说，同这样的问题，在google或baidu应该很多。他却回答说，一不想使用Javascript，二真正的是想看看你的解决方法。

下面是Insus.NET实现的效果：

实现过程，只是为DropDownList控件写OnDataBound事件，

DropDownList1_DataBound protected void DropDownList1_DataBound(object sender, EventArgs e)
    {
        DropDownList ddl = (DropDownList)sender;

        for (int i = 0; i < ddl.Items.Count; i++)
        {
            //当然你可以在这里为每个item写上其它的显示的内容。
            ddl.Items[i].Attributes.Add("title", ddl.Items[i].Text);
        }
    }

完整的程序，xxx.aspx:

View Code <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
       <asp:DropDownList ID="DropDownList1" runat="server" OnDataBound="DropDownList1_DataBound">
        </asp:DropDownList>
    </div>
    </form>
</body>
</html>

xxx.aspx.cs:

View Code using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Data_Binding();
        }
    }

    private void Data_Binding()
    {
        DropDownList1.DataSource = Datas();
        DropDownList1.DataTextField = "value";
        DropDownList1.DataValueField = "key";
        DropDownList1.DataBind();
    }

    protected void DropDownList1_DataBound(object sender, EventArgs e)
    {
        DropDownList ddl = (DropDownList)sender;

        for (int i = 0; i < ddl.Items.Count; i++)
        {
            //当然你可以在这里为每个item写上其实的显示的内容。
            ddl.Items[i].Attributes.Add("title", ddl.Items[i].Text);
        }
    }

    private Dictionary<int, string> Datas()
    {
        Dictionary<int, string> Dd = new Dictionary<int, string>();
        Dd.Add(1, "米饭");
        Dd.Add(3, "紫菜汤");
        Dd.Add(4, "菜心");
        Dd.Add(5, "肉片");
        return Dd;
    }
}