This example demonstrates how to use IList Generic Interface to store data.
This example demonstrates how to use IList Generic Interface to store data.
IList Generic Interface represents a collection of objects that can be individually accessed by index.
First, you will need to import the System.Collections.Generic namespace.
| Imports System.Collections.Generic; |
The System.Collections.Generic namespace contains interfaces and classes that define generic collections, which allow users to create strongly typed collections that provide better type safety and performance than non-generic strongly typed collections.
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We use the BindData function to do the work.
We use GridView control to display data. The code as follow:
Private Sub BindData()
Dim userinfos As IList(Of UserInfo) = New List(Of UserInfo) Dim i As Integer For i = 0 To 4
Dim info As New UserInfo("username" + i.ToString(), "password" + i.ToString()) userinfos.Add(info) Next i Me.GridView1.DataSource = userinfos Me.GridView1.DataBind() |
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I add one userinfo custom class which is used to store data.The code as follow:
Imports System
'/ <summary>
'/ UserInfo
'/ </summary>
Public Class UserInfo
Private _userName As String = String.Empty Private _password As String = String.Empty Public Sub New() End Sub Public Sub New(ByVal userName As String, ByVal password As String)
Me._userName = userName
Me._password = password End Sub Public ReadOnly Property UserName() As String
Get
Return _userName End Get End Property Public ReadOnly Property Password() As String
Get
Return _password End Get End Property |
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The front end TemplateVB.aspx page looks something like this:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BackColor="White" BorderColor="#E7E7FF" BorderStyle="None" BorderWidth="1px" CellPadding="3" GridLines="Horizontal">
<FooterStyle BackColor="#B5C7DE" ForeColor="#4A3C8C" /> <Columns>
<asp:BoundField DataField="UserName" HeaderText="UserName" /> <asp:BoundField DataField="Password" HeaderText="Password" /> </Columns> <RowStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" /> <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="#F7F7F7" /> <PagerStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" HorizontalAlign="Right" /> <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#F7F7F7" /> <AlternatingRowStyle BackColor="#F7F7F7" /> |
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The flow for the code behind page is as follows.
Imports System
Imports System.Data
Imports System.Configuration
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports System.Web.UI.HtmlControls
Imports System.Collections.Generic
Partial Class _Default
Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not Page.IsPostBack Then
BindData() End If End Sub Private Sub BindData()
Dim userinfos As IList(Of UserInfo) = New List(Of UserInfo) Dim i As Integer For i = 0 To 4
Dim info As New UserInfo("username" + i.ToString(), "password" + i.ToString())
userinfos.Add(info) Next i Me.GridView1.DataSource = userinfos Me.GridView1.DataBind() End Sub |
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