ASP.NET - The SortedList Object
The SortedList object combines the features of both the ArrayList object and the Hashtable object.
 |
Try it Yourself - Examples |
SortedList RadiobuttonList 1
SortedList RadiobuttonList 2
SortedList DropDownList
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:
Example
<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>
|
Show example »
|
Whether you're new to XML or already an advanced user, the user-friendly views and powerful entry helpers, wizards, and debuggers in XMLSpy are designed to meet your XML and Web development needs from start to finish.
New features in Version 2010!
- XML editor
- Graphical XML Schema / DTD editors
- XSLT 1.0/2.0 editor, debugger, profiler
- XQuery editor, debugger, profiler
- XBRL validator, taxonomy editor, taxonomy wizard
- Support for Office Open XML (OOXML)
- Graphical WSDL 1.1/2.0 editor & SOAP debugger
- JSON editing & conversion
- Java, C#, C++ code generation
- 32-bit and 64-bit versions
- And much more!
Download a free trial today!
|
|
|
|
