前面講述了Hashtable對象,下面我們開始講述SortedList 對象。
SortedList 對象兼有 ArrayList 和 Hashtable 對象的特性。
SortedList 對象包含用鍵/值對表示的項目。SortedList 對象可按照字符順序或數字順序自動地對項目進行排序。
通過 Add() 方法向 SortedList 添加項目。SortedList 可通過 TrimToSize() 方法調整為最終尺寸。本信息代表文章來源網頁教學webjx.com請大家去www.webjx.com浏覽!
下面的代碼創建了一個名為 mycountries 的 SortedList,並添加了四個元素:
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New SortedList
mycountries.Add("C","China")
mycountries.Add("S","Sweden")
mycountries.Add("F","France")
mycountries.Add("I","Italy")
end if
end sub
</script>
SortedList 對象可自動地為下面的控件生成文本和值:
如需把數據綁定到 RadioButtonList 控件,首先請在 aspx 文件中創建一個 RadioButtonList 控件(沒有任何 asp:ListItem 元素):
<html> <body> <form runat="server"> <asp:RadioButtonList id="rb" runat="server" AutoPostBack="True" /> </form> </body> </html>
然後添加構建列表的腳本:
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New SortedList
mycountries.Add("C","China")
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>
然後我們添加一個子例程,該子例程會在用戶點擊 RadioButtonList 控件中的項目時執行。當單選按鈕被點擊時,文本將出現在 label 中:
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New SortedList
mycountries.Add("C","China")
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>