您的位置：首页 > 移动开发 > Objective-C

ASP.NET - The SortedList Object

2007-03-06 15:33 393 查看

1.Example 1 - SortedList RadioButtonList

France

Italy

Norway

Sweden

Your favorite country is: France

2.Example 2 - SortedList RadiobuttonList

<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim navigate=New SortedList
navigate.Add("RadioButtonList","control_radiobuttonlist.asp")
navigate.Add("CheckBoxList","control_checkboxlist.asp")
navigate.Add("DropDownList","control_dropdownlist.asp")
navigate.Add("ListBox","control_listbox.asp")
rb.DataSource=navigate
rb.DataValueField="Value"
rb.DataTextField="Key"
rb.DataBind()
end if
end sub

sub navigate(s as Object, e As EventArgs)
response.redirect(rb.SelectedItem.Value)
end sub
</script>

<html> <body>

<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" onSelectedIndexChanged="navigate" />
</form>

</body> </html>

Output Result:

CheckBoxList
DropDownList
ListBox
RadioButtonList
when you click one of the radios ,it will shows:(example:you have clicked the radio 'CheckBoxList')

the hamepage will redirect to the url 'control_checkboxlist.asp'

3.Example 3 - SortedList DropDownList

<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")
dd.DataSource=mycountries
dd.DataValueField="Key"
dd.DataTextField="Value"
dd.DataBind()
end if
end sub

sub displayMessage(s as Object,e As EventArgs)
lbl1.text="Your favorite country is: " & dd.SelectedItem.Text
end sub
</script>

<html> <body>

<form runat="server">
<asp:DropDownList id="dd" runat="server"
AutoPostBack="True" onSelectedIndexChanged="displayMessage" />
<p><asp:label id="lbl1" runat="server" /></p>
</form>

</body> </html>
Output Result:

France
Italy
Norway
Sweden
when you click one of the selects ,it will shows:(example:you have clicked the option 'france')

France
Italy
Norway
Sweden

Your favorite country is: France

The SortedList Object

The SortedList object contains items in key/value pairs. A SortedList object automatically sort the items in alphabetic or numeric order.

Items are added to the SortedList with the Add() method. A SortedList can be sized to its final size with the TrimToSize() method.

The following code creates a SortedList named mycountries and four elements are added:

<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

A SortedList object may automatically generate the text and values to the following controls:

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:

<html>
<body>

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

</body>
</html>

Then add the script that builds the list:

<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:

<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>

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航