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ASP.NET SortedList
ASP.NET Web Forms - SortedList 对象SortedList 对象结合了 ArrayList 对象和 Hashtable 对象的特性。尝试一下 - 实例SortedList RadiobuttonList 1SortedList RadiobuttonList 2SortedList DropDownListSortedList 对象SortedList 对象包含用键/值对表示的项目。SortedList 对象按照字母顺序或者数字顺序自动地对项目进行排序。通过 Add() 方法向 SortedList 添加项目。通过 TrimToSize() 方法把 SortedList 调整为最终尺寸。下面的代码创建了一个名为 mycountries 的 SortedList 对象，并添加了四个元素：<script runat="server">sub Page_Loadif Not Page.IsPostBack thendim mycountries=New SortedListmycountries.Add("N","Norway")mycountries.Add("S","Sweden")mycountries.Add("F","France")mycountries.Add("I","Italy")end ifend sub</script>数据绑定SortedList 对象可为下列的控件自动生成文本和值：asp:RadioButtonListasp:CheckBoxListasp:DropDownListasp:Listbox为了绑定数据到 RadioButtonList 控件，首先要在 .aspx 页面中创建一个 RadioButtonList 控件（不带任何 asp:ListItem 元素）：<html><body><form runat="server"><asp:RadioButtonList id="rb" runat="server"AutoPostBack="True" /></form></body></html>然后添加创建列表的脚本，并且绑定列表中的值到 RadioButtonList 控件：<script runat="server">sub Page_Loadif Not Page.IsPostBack thendim mycountries=New SortedListmycountries.Add("N","Norway")mycountries.Add("S","Sweden")mycountries.Add("F","France")mycountries.Add("I","Italy")rb.DataSource=mycountriesrb.DataValueField="Key"rb.DataTextField="Value"rb.DataBind()end ifend sub</script><html><body><form runat="server"><asp:RadioButtonList id="rb" runat="server"AutoPostBack="True" /></form></body></html>然后我们添加一个子例程，当用户点击 RadioButtonList 控件中的某个项目时，该子例程会被执行。当某个单选按钮被点击时，label 中会出现一行文本：实例<script runat="server">sub Page_Loadif Not Page.IsPostBack thendim mycountries=New SortedListmycountries.Add("N","Norway")mycountries.Add("S","Sweden")mycountries.Add("F","France")mycountries.Add("I","Italy")rb.DataSource=mycountriesrb.DataValueField="Key"rb.DataTextField="Value"rb.DataBind()end ifend subsub displayMessage(s as Object,e As EventArgs)lbl1.text="Your favorite country is: " & rb.SelectedItem.Textend sub</script><html><body><form runat="server"><asp:RadioButtonList id="rb" runat="server"AutoPostBack="True" onSelectedIndexChanged="displayMessage" /><p><asp:label id="lbl1" runat="server" /></p></form></body></html>演示实例 ?
ASP.NET SortedList
