ASP.NET - The SortedList Object 可排序列表对象(ASP.NET,SortedList,可排序列表对象)W3POP.COM

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

作者:w3schools 翻译/整理:w3pop.com 发布:2007-08-08 浏览:2033 ::

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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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