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How to use IList Generic Interface to store data VB.NET
IList Generic Interface represents a collection of objects that can be individually accessed by index.
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; |
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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.
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 |
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" /> |
The flow for the code behind page is as follows.
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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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