Filter data object using LINQ?

You can always use an anonymous type; e.g. -

Default.aspx -

<%@ Page Title="Home Page" Language="VB" AutoEventWireup="true" CodeBehind="Default.aspx.vb" Inherits="EE_Q28964203._Default" %>
<form id="form1" runat="server">
	<asp:GridView ID="GridView1" runat="server">
	</asp:GridView>
</form>

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Default.aspx.vb -

Public Class _Default
	Inherits Page
	ReadOnly people As New List(Of Person)(From i In Enumerable.Range(0, 20) Select New Person() With {.ID = i, .FirstName = String.Format("Firstname{0}", i), .MiddleName = String.Format("Middlename{0}", i), .LastName = String.Format("Lastname{0}", i), .IsWorking = i Mod 2 = 0, .Birthdate = DateTime.Now.AddYears(-(9 * i + 1))})

	Protected Sub OnLoad(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
		GridView1.DataSource = (From p In people Select New With {p.ID, p.FullName, p.Age}).ToList()
		GridView1.DataBind()
	End Sub
End Class

Class Person
	Public Property ID() As Integer
	Public Property FirstName() As String
	Public Property MiddleName() As String
	Public Property LastName() As String
	Public Property Birthdate() As DateTime
	Public Property IsWorking() As Boolean

	Public ReadOnly Property FullName() As String
		Get
			Return String.Format("{0} {1}. {2}", FirstName, MiddleName.First(), LastName())
		End Get
	End Property

	Public ReadOnly Property Age() As String
		Get
			Return String.Format("{0} years old", DateTime.Now.Year - Birthdate.Year)
		End Get
	End Property
End Class

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Default.aspx.designer.vb -

'------------------------------------------------------------------------------
' <auto-generated>
'     This code was generated by a tool.
'
'     Changes to this file may cause incorrect behavior and will be lost if
'     the code is regenerated. 
' </auto-generated>
'------------------------------------------------------------------------------

Option Strict On
Option Explicit On


Partial Public Class _Default

	'''<summary>
	'''form1 control.
	'''</summary>
	'''<remarks>
	'''Auto-generated field.
	'''To modify move field declaration from designer file to code-behind file.
	'''</remarks>
	Protected WithEvents form1 As Global.System.Web.UI.HtmlControls.HtmlForm

	'''<summary>
	'''GridView1 control.
	'''</summary>
	'''<remarks>
	'''Auto-generated field.
	'''To modify move field declaration from designer file to code-behind file.
	'''</remarks>
	Protected WithEvents GridView1 As Global.System.Web.UI.WebControls.GridView
End Class

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Produces the following output -You just want to make sure that if what you are showing needs to allow CRUD methods that you provide a way to connect the displayed row with it's associated datarow; i.e. - I would connect my data row by the id field.

-saige-

Ok I was able to apply this filter to my DataSource which just has the fields I want so it works great but when I do the DataBind it throws an error

"Unable to cast object of type 'System.Collections.Generic.List`1[VB$AnonymousType_3`7[System.Int32,System.String,System.Int32,System.Int32,System.Int32,System.String,System.String]]' to type 'System.Collections.Generic.List`1[CRIB_EMS.BLL.WorkItem]'."

Now, I didnt put in the this piece of code but it looks like this is what I am missing?

ReadOnly people As New List(Of Person)(From i In Enumerable.Range(0, 20) Select New Person() With {.ID = i, .FirstName = String.Format("Firstname{0}", i), .MiddleName = String.Format("Middlename{0}", i), .LastName = String.Format("Lastname{0}", i), .IsWorking = i Mod 2 = 0, .Birthdate = DateTime.Now.AddYears(-(9 * i + 1))})

Im just a little confused on how I can create this for my object. I though this was for formatting the fields to display(ie, FullName and Birthdate) which I dont need to do. So If I want to just display the records how they are coming back, how would I do that?

Thanks again!!!

You....your good you!!

Thanks
JK

thanks again