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Net Getting Started Tutorial: ASP. NET Hashtable object tutorial

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ASP. NET Hashtable object tutorial

The hash table object contains the key/value pairs of the project.

Let's look at an example.

<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>

<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>


Create a hash table
The hash table object contains the key/value pairs of the project. Use the key as an indicator and quickly search for the value that can be used for search through their key.

The project is added to the hash table and the purchase () method.

The following code creates a hash table named mycountries and describes the four elements:

<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>
Controls the text and values automatically generated by data-bound hash table objects: dynamic: RadioButtonList dynamic: CheckBoxList dynamic: drop-down list dynamic: the list box binds data to the RadioButtonList control, first, create a RadioButtonList control (without any ASP: ListItem element. Aspx page: <Body> <form runat = "server">
<Asp: RadioButtonList id = "rb" runat = "server"
AutoPostBack = "True"/> </form> </body>
</Html> add a script and create a list: <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> <Body> <form runat = "server">
<Asp: RadioButtonList id = "rb" runat = "server"
AutoPostBack = "True"/> </form> </body>
</Html> then, when we add a subroutine to be executed, the user clicks a project RadioButtonList control. When a single-choice button is clicked, a text will appear in a tag: <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 subsub displayMessage (s as Object, e As EventArgs)
Lbl1.text = "Your favorite country is:" & rb. SelectedItem. Text
End sub
</Script> <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> Note: a hash table is added for items in the sorting order that you cannot select. Project categories use SortedList objects in alphabetical order or numeric values.

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