SortedList 對(duì)象結(jié)合了 ArrayList 對(duì)象和 Hashtable 對(duì)象的特性。
嘗試一下 - 實(shí)例
SortedList RadiobuttonList 1
SortedList RadiobuttonList 2
SortedList DropDownList
SortedList 對(duì)象
SortedList 對(duì)象包含用鍵/值對(duì)表示的項(xiàng)目。SortedList 對(duì)象按照字母順序或者數(shù)字順序自動(dòng)地對(duì)項(xiàng)目進(jìn)行排序。
通過(guò) Add() 方法向 SortedList 添加項(xiàng)目。通過(guò) TrimToSize() 方法把 SortedList 調(diào)整為最終尺寸。
下面的代碼創(chuàng)建了一個(gè)名為 mycountries 的 SortedList 對(duì)象，并添加了四個(gè)元素：
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>
數(shù)據(jù)綁定
SortedList 對(duì)象可為下列的控件自動(dòng)生成文本和值：
- asp:RadioButtonList
- asp:CheckBoxList
- asp:DropDownList
- asp:Listbox
為了綁定數(shù)據(jù)到 RadioButtonList 控件，首先要在 .aspx 頁(yè)面中創(chuàng)建一個(gè) RadioButtonList 控件（不帶任何 asp:ListItem 元素）：
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server" AutoPostBack="True" />
</form>
</body>
</html>
然后添加創(chuàng)建列表的腳本，并且綁定列表中的值到 RadioButtonList 控件：
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>
然后我們添加一個(gè)子例程，當(dāng)用戶點(diǎn)擊 RadioButtonList 控件中的某個(gè)項(xiàng)目時(shí)，該子例程會(huì)被執(zhí)行。當(dāng)某個(gè)單選按鈕被點(diǎn)擊時(shí)，label 中會(huì)出現(xiàn)一行文本：
實(shí)例
<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>
<!DOCTYPE html>
<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>運(yùn)行實(shí)例 ?
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