Populating DataKeyNames
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From: Mike on 15 Feb 2010 07:55 How do you assign the properties in the collection to the DataKeyNames of the gridview? GridView1.DataSource = p.lpers GridView1.DataBind() If I was binding to a SqlDataReader it might say: GridView1.DataSource = myDataReader; GridView1.DataKeyNames = new string[] { "FirstName", "Surname", "etc" }; GridView1.DataBind(); How do you populate the DataKeyNames when binding to a Generic List? Thanks for any helpl. Mike Urquiola wrote: The problem is you only have one person object, and you keep overwriting the 22-Apr-08 The problem is you only have one person object, and you keep overwriting the properties. Try this. Public Sub arrFill() p = new Person(); -Create new person object here. p.GetPersVorname = TextBox1.Text p.GetPersNachname = TextBox2.Text p.GetPersAlter = TextBox3.Text p.GetPersGeburtsort = TextBox4.Text p.lpers.Add(p) GridView1.DataSource = p.lpers GridView1.DataBind() End Sub "Andreas Hartje" <andreas.hartje(a)unibw.de> wrote in message news:911D5625-4F8F-4381-A99B-20BB82978CDA(a)microsoft.com... Previous Posts In This Thread: On Monday, April 21, 2008 1:22 PM Andreas Hartje wrote: Binding a generic List to GridView Hi there, sorry for crossposting, it's getting late in the evening here in Europe :-( I have a little problem binding a generic list to a GridView. The List gets filled with data from textboxes (via properties in class Person, see below) and I want the grid to show each new set of textbox strings to show up as a new row in the grid. i mahaged to do this by definig a little sessionmanagement but the really problem now is that each time I post the strings to the server, the previus set of data/strings in my grid (and also in the List) gets overritten with the last input of strings. In the end i get thre or four or more rows in my dataset with the strings of the textbox input. Any idea about this? Thanks very much, Andi CODE: Public Class Person Public lpers As New List(Of Person) Private vorname As String Private nachname As String Private alter As String Private geburtsort As String Public Property GetPersVorname() As String Get Return vorname End Get Set(ByVal value As String) vorname = value End Set End Property Public Property GetPersNachname() As String Get Return nachname End Get Set(ByVal value As String) nachname = value End Set End Property Public Property GetPersAlter() As String Get Return alter End Get Set(ByVal value As String) alter = value End Set End Property Public Property GetPersGeburtsort() As String Get Return geburtsort End Get Set(ByVal value As String) geburtsort = value End Set End Property End Class Dim p As New Person Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If IsNothing(Session("Person")) Then Session("Person") = New Person End If p = Session("Person") End Sub Public Sub arrFill() p.GetPersVorname = TextBox1.Text p.GetPersNachname = TextBox2.Text p.GetPersAlter = TextBox3.Text p.GetPersGeburtsort = TextBox4.Text p.lpers.Add(p) GridView1.DataSource = p.lpers GridView1.DataBind() End Sub Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click arrFill() End Sub On Tuesday, April 22, 2008 11:54 AM Mike Urquiola wrote: The problem is you only have one person object, and you keep overwriting the The problem is you only have one person object, and you keep overwriting the properties. Try this. Public Sub arrFill() p = new Person(); -Create new person object here. p.GetPersVorname = TextBox1.Text p.GetPersNachname = TextBox2.Text p.GetPersAlter = TextBox3.Text p.GetPersGeburtsort = TextBox4.Text p.lpers.Add(p) GridView1.DataSource = p.lpers GridView1.DataBind() End Sub "Andreas Hartje" <andreas.hartje(a)unibw.de> wrote in message news:911D5625-4F8F-4381-A99B-20BB82978CDA(a)microsoft.com... On Tuesday, April 22, 2008 1:51 PM Chris Shepherd wrote: Re: Binding a generic List to GridView Mike Urquiola wrote: Also, you should be using BindingList instead of List since BindingList will publish changes while List will not. Chris. On Wednesday, April 23, 2008 4:31 AM AndreasHartj wrote: Hi Mike,thanks for your answer, I added your "p = new Person" to my Sub Hi Mike, thanks for your answer, I added your "p = new Person" to my Sub arrFill(), but unfortunately this does not make any difference, at least not the one you intended. No new row ist added after a postback, instead the only row gets updated withe the changes made in the textboxes. I already use the BindList intead of List as Chris (see follow up post to your post) ... no difference at all. What else can do about this? Thanks in advance for all your suggestions .... Andi Code now lokks like: Public Class Person .... End Class Dim p As New Person() Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If IsNothing(Session("Person")) Then Session("Person") = New Person() Else p = Session("Person") End If End Sub Public Sub arrFill() p = New Person() p.Vorname = TextBox1.Text p.Nachname = TextBox2.Text p.Alter = TextBox3.Text p.Geburtsort = TextBox4.Text p.list_pers.Add(p) GridView1.DataSource = p.list_pers Me.DataBind() End Sub "Mike Urquiola" wrote: On Wednesday, April 23, 2008 10:03 AM Mike Urquiola wrote: Store the BindingList in session, rather than the person. Store the BindingList in session, rather than the person. On Wednesday, April 23, 2008 1:11 PM Andreas Hartje wrote: THAT'S IT!!!Thanks very much, Mike ... you saved my evening ... and more! THAT'S IT!!! Thanks very much, Mike ... you saved my evening ... and more! Andi "Mike Urquiola" <mike(a)urquiola.org> schrieb im Newsbeitrag Submitted via EggHeadCafe - Software Developer Portal of Choice Sending SMTP email from within BizTalk Orchestration http://www.eggheadcafe.com/tutorials/aspnet/9dd0f346-baf9-4674-a50f-1716445b26bc/sending-smtp-email-from-w.aspx |