ASP. NET Web Forms-SortedList object, formssortedlist

ASP. NET Web Forms-SortedList object, formssortedlist

ASP. NET Web Forms-SortedList object

SortedList objects combine the features of ArrayList objects and Hashtable objects.

SortedList object

The SortedList object contains items represented by key/value pairs. SortedList objects are automatically sorted in alphabetical or numerical order.

Use the Add () method to Add a project to SortedList. Adjust SortedList to the final size using the TrimToSize () method.

The following code creates a SortedList object named mycountries and adds four elements:

Data Binding

The SortedList object can automatically generate text and values for the following controls:

AutoPostBack = "True" onSelectedIndexChanged = "displayMessage"/>

Asp: RadioButtonList

Asp: CheckBoxList

Asp: DropDownList

Asp: Listbox

To bind data to the RadioButtonList control, you must first create a RadioButtonList control (without any asp: ListItem element) on the. aspx page ):

Then add the script for creating the list and bind the values in the list to the RadioButtonList control:

Then we add a child routine. When you click a project in the RadioButtonList control, the child routine will be executed. When a single-choice button is clicked, a line of text appears in the 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>