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ASP.NET - The SortedList Object 可排序列表对象

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-03-01   浏览: 1002 ::
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The SortedList object combines the features of both the ArrayList object and the Hashtable object.
可排序列表对象结合了数组列表对象以及哈希表对象的特点。

Examples 举例

Example 1 - SortedList RadioButtonList

Example 2 - SortedList RadiobuttonList

Example 3 - SortedList DropDownList

The SortedList Object
可排序列表对象

The SortedList object contains items in key/value pairs. A SortedList object automatically sort the items in alphabetic or numeric order.
可排序列表对象对象包含项目中的 键/值 对。可排序列表对象可自动的以字母或是数字来进行排序。

Items are added to the SortedList with the Add() method. A SortedList can be sized to its final size with the TrimToSize() method.
使用Add()方法可以将项目填加到可排序列表对象中。可排序列表可以使用TrimToSize()方法来将大小调整到最后的大小。

The following code creates a SortedList named mycountries and four elements are added:
下面的代码会建立一个可排序列表，名称为 mycountries 并且加入了四个元素：

<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
 dim mycountries=New SortedList
 mycountries.Add("N","Norway")
 mycountries.Add("S","Sweden")
 mycountries.Add("F","France")
 mycountries.Add("I","Italy")
end if
end sub
</script>

 

Data Binding
数据绑定

A SortedList object may automatically generate the text and values to the following controls:
可排序列表对象可以自动的给下面这些控件生成文字以及值：

  • asp:RadioButtonList
  • asp:CheckBoxList
  • asp:DropDownList
  • asp:Listbox

To bind data to a RadioButtonList control, first create a RadioButtonList control (without any asp:ListItem elements) in an .aspx page:
要被 RadioButtonList 控件绑定数据，首先要在一个.aspx页面中建立 RadioButtonList 控件 (不需要任何asp:ListItem 元素)：

<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" />
</form>
</body>
</html>

Then add the script that builds the list:
然后加入脚本来生成列：

<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
 dim mycountries=New SortedList
 mycountries.Add("N","Norway")
 mycountries.Add("S","Sweden")
 mycountries.Add("F","France")
 mycountries.Add("I","Italy")
 rb.DataSource=mycountries
 rb.DataValueField="Key"
 rb.DataTextField="Value"
 rb.DataBind()
end if
end sub
</script>
<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" />
</form>
</body>
</html>

Then we add a sub routine to be executed when the user clicks on an item in the RadioButtonList control. When a radio button is clicked, a text will appear in a label:
然后我们加入子程序，当用户按下RadioButtonList控件中的项目就会执行。当单选按钮按下后，一段文字就会显示在标签中：

<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
 dim mycountries=New SortedList
 mycountries.Add("N","Norway")
 mycountries.Add("S","Sweden")
 mycountries.Add("F","France")
 mycountries.Add("I","Italy")
 rb.DataSource=mycountries
 rb.DataValueField="Key"
 rb.DataTextField="Value"
 rb.DataBind()
end if
end sub
sub displayMessage(s as Object,e As EventArgs)
lbl1.text="Your favorite country is: " & rb.SelectedItem.Text
end 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>

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