DropDownList小例
实现内容：
1.通过DropDownList控件DataSource属性绑定数据源，
2.通过Items.Add给DropDownList添加项，
3.遍历若干有规律的DropDownList控件，给每个DropDownList添加相同的项。
代码：
Code<%@ Page Language="C#" Debug="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
string[] CarArray = new string[4] { "Ford", "Honda", "BMW", "Dodge" };
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
DropDownList1.DataSource = CarArray;
DropDownList1.DataBind();
}
protected void Button2_Click(object sender, EventArgs e)
{
DropDownList1.Items.Clear();
for (int i = 0; i < 5; i++)
{
DateTime date = DateTime.Today + new TimeSpan(i, 0, 0, 0);
DropDownList1.Items.Add(date.ToString("MMMM dd, yyyy"));
}
}
protected void Button3_Click(object sender, EventArgs e)
{
//清空所有DropDownList的原有项
for (int k = 1; k <= 3; k++)
{
DropDownList DropDownList123 = (DropDownList)Page.FindControl("DropDownList" + k.ToString());
DropDownList123.Items.Clear();
}
//给所有DropDownList增加新项
ListItem ListItem1;
for (int i = 0; i <= 5; i++)
{
ListItem1 = new ListItem();
ListItem1.Text = i.ToString() + "分";
ListItem1.Value = i.ToString();
for (int k = 1; k <= 3; k++)
{
DropDownList DropDownList123 = (DropDownList)Page.FindControl("DropDownList" + k.ToString());
DropDownList123.Items.Add(ListItem1);
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="赋值1" OnClick="Button1_Click"/>
<asp:Button ID="Button2" runat="server" Text="赋值2" OnClick="Button2_Click"/>
<asp:Button ID="Button3" runat="server" Text="赋值3" OnClick="Button3_Click"/><br />
<br />
<br />
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
<asp:DropDownList ID="DropDownList2" runat="server">
</asp:DropDownList>
<asp:DropDownList ID="DropDownList3" runat="server">
</asp:DropDownList>
</div>
</form>
</body>
</html>
