Web 表單哈希表
ASP.NET Web Forms - Hashtable 物件
#Hashtable 物件包含以鍵/值物件表示的項目。
試試看- 實例
Hashtable RadiobuttonList 1
Hashtable RadiobuttonList 2
#Hashtable DropDownList
建立Hashtable
Hashtable 物件包含以鍵/值對錶示的項目。鍵被用作索引，透過搜尋鍵，可以實現對值的快速搜尋。
透過 Add() 方法將項目新增至 Hashtable。
下面的程式碼建立了一個名為mycountries 的Hashtable 對象，並加入了四個元素：
<script runat="server">
Sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
# mycountries.Add("N","Norway")
mycountries.Add("S","Sweden")
mycountries.Add("F","France")
mycountries.Add("I","Italy")
end if
end sub
</script>Sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
# mycountries.Add("N","Norway")
mycountries.Add("S","Sweden")
mycountries.Add("F","France")
mycountries.Add("I","Italy")
end if
end sub
資料綁定Hashtable 物件可為下列的控制項自動產生文字和值：
- asp:RadioButtonListasp:CheckBoxListasp:DropDownList
- asp:Listbox
<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server" AutoPostBack="True" />
</form>
#</body>
然後新增建立清單的腳本，並且綁定清單中的值到RadioButtonList 控制項：
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
# 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>
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
# 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>
</html>
#然後我們加入子例程，當使用者點選RadioButtonList 控制項中的某個項目時，該子程式會被執行。當某個單選按鈕被點擊時，label 中會出現一行文字：
實例#
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
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>##執行實例»
#註解：
您無法選擇新增至Hashtable 的項目的排序方式。如需對項目進行字母排序或數字排序，請使用 SortedList 物件。
