Can"t get rid of this error. ListView. Please, need help.

Can"t get rid of this error. ListView. Please, need help.

am 01.02.2008 16:36:47 von Shapper

Hello,

I created an ASP.NET ListView at runtime connected to a
LinqDataSource. I always get the same error when I click the Cancel or
Update buttons in EditItemTemplate:

Invalid postback or callback argument.
Event validation is enabled using > in configuration or <%@ Page EnableEventValidation="true" %> in a
page.
For security purposes, this feature verifies that arguments to
postback or callback events originate from the server control that
originally rendered them.
If the data is valid and expected, use the
ClientScriptManager.RegisterForEventValidation method in order to
register the postback or callback data for validation.

I tried everything I could think of for the past 2 days but I can't
figure out what is wrong.

Could someone, please, help me?

I am posting my entire code.

Thank You,

Miguel

ListViewLab.Aspx

<%@ Page Language="VB" AutoEventWireup="false"
CodeFile="ListViewLab.aspx.vb" Inherits="ListViewLab" %>

www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



Untitled Page



asp:PlaceHolder>




ListViewLab.Aspx.vb

Partial Class ListViewLab
Inherits System.Web.UI.Page

Protected WithEvents ldsTags As New LinqDataSource
Protected WithEvents lvTags As New ListView

Protected Sub Page_Init(ByVal sender As Object, ByVal e As
EventArgs) Handles Me.Init
phListViewLab.Controls.Add(ldsTags)
phListViewLab.Controls.Add(lvTags)
End Sub

Private Sub ldsTags_Init(ByVal sender As Object, ByVal e As
EventArgs) Handles ldsTags.Init
With ldsTags
.ContextTypeName = "MyListViewDataContext"
.EnableDelete = True
.EnableInsert = True
.EnableUpdate = True
.TableName = "Tags"
.ID = "ldsTags"
End With
End Sub

Private Sub ldsTags_Selecting(ByVal sender As Object, ByVal e As
LinqDataSourceSelectEventArgs) Handles ldsTags.Selecting
Dim database As New MyListViewDataContext
Dim tags = From t In database.Tags _
Select t.TagID, _
t.Text, _
Active = t.FilesTags.Any Or t.ArticlesTags.Any
e.Result = tags
End Sub

Private Sub lvTags_ItemDeleting(ByVal sender As Object, ByVal e As
ListViewDeleteEventArgs) Handles lvTags.ItemDeleting
Dim database As New MyListViewDataContext
Dim tag = (From t In database.Tags _
Where t.TagID = New
Guid(lvTags.DataKeys(e.ItemIndex).Value.ToString)).Single
database.Tags.DeleteOnSubmit(tag)
database.SubmitChanges()
End Sub

Private Sub lvTags_Init(ByVal sender As Object, ByVal e As
EventArgs) Handles lvTags.Init
With lvTags
.DataKeyNames = New String() {"TagID"}
.DataSourceID = "ldsTags"
.ID = "lvTags"
.InsertItemPosition = InsertItemPosition.FirstItem
End With
With lvTags
.EditItemTemplate = New
ListViewLabTemplate(TemplateType.EditItemTemplate)
.ItemTemplate = New
ListViewLabTemplate(TemplateType.ItemTemplate)
.LayoutTemplate = New
ListViewLabTemplate(TemplateType.LayoutTemplate)
End With

End Sub

Private Sub lvTags_Load(ByVal sender As Object, ByVal e As
EventArgs) Handles lvTags.Load
lvTags.DataBind()
End Sub

ListViewTemplate Class

Public Class ListViewLabTemplate
Implements ITemplate

Private _Type As TemplateType
Public Property Type() As TemplateType
Get
Return _Type
End Get
Set(ByVal value As TemplateType)
_Type = value
End Set
End Property ' Type

Public Sub InstantiateIn(ByVal container As Control) Implements
ITemplate.InstantiateIn
Select Case Me.Type
Case TemplateType.EditItemTemplate
EditItemTemplate(container)
Case TemplateType.ItemTemplate
ItemTemplate(container)
Case TemplateType.LayoutTemplate
LayoutTemplate(container)
End Select
End Sub ' InstantiateIn

Private Sub lbDelete_Init(ByVal sender As Object, ByVal e As
EventArgs)
Dim lbDelete As LinkButton = CType(sender, LinkButton)
With lbDelete
.CommandName = "Delete"
.ID = "lbDelete"
.Text = "Delete"
End With
End Sub

Private Sub lbEdit_Init(ByVal sender As Object, ByVal e As
EventArgs)
Dim lbEdit As LinkButton = CType(sender, LinkButton)
With lbEdit
.CommandName = "Edit"
.ID = "lbEdit"
.Text = "Edit"
End With
End Sub

Private Sub lText_DataBinding(ByVal sender As Object, ByVal e As
EventArgs)
Dim lText As Literal = CType(sender, Literal)
Dim lvdiContainer As ListViewDataItem =
CType(lText.NamingContainer, ListViewDataItem)
lText.Text = DataBinder.Eval(lvdiContainer.DataItem, "Text")
End Sub

Public Sub New(ByVal type As TemplateType)
Me.Type = type
End Sub

Private Sub EditItemTemplate(ByVal container As Control)

Dim form As New HtmlTableCell
form.ColSpan = 3

Dim a As New Button
a.CommandName = "Cancel"
a.CommandArgument = ""
a.Text = "Cancel"
Dim b As New Button
b.CommandName = "Update"
b.CommandArgument = ""
b.Text = "Update"
Dim c As New TextBox
c.ID = "tbTag"
AddHandler c.DataBinding, AddressOf c_DataBinding
form.Controls.Add(a)
form.Controls.Add(b)
form.Controls.Add(c)

Dim tag As New HtmlTableRow
tag.Controls.Add(form)

container.Controls.Add(tag)

End Sub

Private Sub ItemTemplate(ByVal container As Control)

Dim lbDelete As New LinkButton
AddHandler lbDelete.Init, AddressOf lbDelete_Init

Dim lbEdit As New LinkButton
AddHandler lbEdit.Init, AddressOf lbEdit_Init

Dim lText As New Literal
AddHandler lText.DataBinding, AddressOf lText_DataBinding

Dim command As New HtmlTableCell
command.Attributes.Add("class", "Command")
With command.Controls
.Add(lbEdit)
.Add(lbDelete)
End With

Dim text As New HtmlTableCell
text.Controls.Add(lText)

Dim tag As New HtmlTableRow
tag.Cells.Add(text)
tag.Cells.Add(command)

container.Controls.Add(tag)

End Sub

Private Sub LayoutTemplate(ByVal container As Control)
Dim command As New HtmlTableCell("th")
command.Attributes.Add("class", "Command")
command.InnerHtml = " "
Dim text As New HtmlTableCell("th")
text.InnerHtml = "Tag"
Dim fields As New HtmlTableRow
With fields.Cells
.Add(text)
.Add(command)
End With
Dim body As New HtmlGenericControl("tbody")
body.ID = "itemPlaceholder"
Dim table As New HtmlGenericControl("table")
table.ID = "tTags"
table.Controls.Add(body)
End Sub

Private Sub c_DataBinding(ByVal sender As Object, ByVal e As
EventArgs)
Dim c As TextBox = CType(sender, TextBox)
Dim lvdiContainer As ListViewDataItem = CType(c.NamingContainer,
ListViewDataItem)
c.Text = DataBinder.Eval(lvdiContainer.DataItem, "Text")
End Sub

End Class

Re: Can"t get rid of this error. ListView. Please, need help.

am 01.02.2008 23:18:39 von JohnKotuby

Have you tried including EnableEventValidation="false" in your @Page
directive?

As in:

<%@ Page Language="VB" AutoEventWireup="false" EnableEventValidation="false"
CodeFile="ListViewLab.aspx.vb" Inherits="ListViewLab" %>

It's not really recommended for good security practices but it might get you
a fix if you are sure the data is valid.


"shapper" wrote in message
news:f8ffefa1-27ff-43b7-a12d-bf0d39fbecb6@c23g2000hsa.google groups.com...
> Hello,
>
> I created an ASP.NET ListView at runtime connected to a
> LinqDataSource. I always get the same error when I click the Cancel or
> Update buttons in EditItemTemplate:
>
> Invalid postback or callback argument.
> Event validation is enabled using >> in configuration or <%@ Page EnableEventValidation="true" %> in a
> page.
> For security purposes, this feature verifies that arguments to
> postback or callback events originate from the server control that
> originally rendered them.
> If the data is valid and expected, use the
> ClientScriptManager.RegisterForEventValidation method in order to
> register the postback or callback data for validation.
>
> I tried everything I could think of for the past 2 days but I can't
> figure out what is wrong.
>
> Could someone, please, help me?
>
> I am posting my entire code.
>
> Thank You,
>
> Miguel
>
> ListViewLab.Aspx
>
> <%@ Page Language="VB" AutoEventWireup="false"
> CodeFile="ListViewLab.aspx.vb" Inherits="ListViewLab" %>
>
> > www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
>
>
>
> Untitled Page
>
>
>


> > asp:PlaceHolder>
>
>
>
>
> ListViewLab.Aspx.vb
>
> Partial Class ListViewLab
> Inherits System.Web.UI.Page
>
> Protected WithEvents ldsTags As New LinqDataSource
> Protected WithEvents lvTags As New ListView
>
> Protected Sub Page_Init(ByVal sender As Object, ByVal e As
> EventArgs) Handles Me.Init
> phListViewLab.Controls.Add(ldsTags)
> phListViewLab.Controls.Add(lvTags)
> End Sub
>
> Private Sub ldsTags_Init(ByVal sender As Object, ByVal e As
> EventArgs) Handles ldsTags.Init
> With ldsTags
> .ContextTypeName = "MyListViewDataContext"
> .EnableDelete = True
> .EnableInsert = True
> .EnableUpdate = True
> .TableName = "Tags"
> .ID = "ldsTags"
> End With
> End Sub
>
> Private Sub ldsTags_Selecting(ByVal sender As Object, ByVal e As
> LinqDataSourceSelectEventArgs) Handles ldsTags.Selecting
> Dim database As New MyListViewDataContext
> Dim tags = From t In database.Tags _
> Select t.TagID, _
> t.Text, _
> Active = t.FilesTags.Any Or t.ArticlesTags.Any
> e.Result = tags
> End Sub
>
> Private Sub lvTags_ItemDeleting(ByVal sender As Object, ByVal e As
> ListViewDeleteEventArgs) Handles lvTags.ItemDeleting
> Dim database As New MyListViewDataContext
> Dim tag = (From t In database.Tags _
> Where t.TagID = New
> Guid(lvTags.DataKeys(e.ItemIndex).Value.ToString)).Single
> database.Tags.DeleteOnSubmit(tag)
> database.SubmitChanges()
> End Sub
>
> Private Sub lvTags_Init(ByVal sender As Object, ByVal e As
> EventArgs) Handles lvTags.Init
> With lvTags
> .DataKeyNames = New String() {"TagID"}
> .DataSourceID = "ldsTags"
> .ID = "lvTags"
> .InsertItemPosition = InsertItemPosition.FirstItem
> End With
> With lvTags
> .EditItemTemplate = New
> ListViewLabTemplate(TemplateType.EditItemTemplate)
> .ItemTemplate = New
> ListViewLabTemplate(TemplateType.ItemTemplate)
> .LayoutTemplate = New
> ListViewLabTemplate(TemplateType.LayoutTemplate)
> End With
>
> End Sub
>
> Private Sub lvTags_Load(ByVal sender As Object, ByVal e As
> EventArgs) Handles lvTags.Load
> lvTags.DataBind()
> End Sub
>
> ListViewTemplate Class
>
> Public Class ListViewLabTemplate
> Implements ITemplate
>
> Private _Type As TemplateType
> Public Property Type() As TemplateType
> Get
> Return _Type
> End Get
> Set(ByVal value As TemplateType)
> _Type = value
> End Set
> End Property ' Type
>
> Public Sub InstantiateIn(ByVal container As Control) Implements
> ITemplate.InstantiateIn
> Select Case Me.Type
> Case TemplateType.EditItemTemplate
> EditItemTemplate(container)
> Case TemplateType.ItemTemplate
> ItemTemplate(container)
> Case TemplateType.LayoutTemplate
> LayoutTemplate(container)
> End Select
> End Sub ' InstantiateIn
>
> Private Sub lbDelete_Init(ByVal sender As Object, ByVal e As
> EventArgs)
> Dim lbDelete As LinkButton = CType(sender, LinkButton)
> With lbDelete
> .CommandName = "Delete"
> .ID = "lbDelete"
> .Text = "Delete"
> End With
> End Sub
>
> Private Sub lbEdit_Init(ByVal sender As Object, ByVal e As
> EventArgs)
> Dim lbEdit As LinkButton = CType(sender, LinkButton)
> With lbEdit
> .CommandName = "Edit"
> .ID = "lbEdit"
> .Text = "Edit"
> End With
> End Sub
>
> Private Sub lText_DataBinding(ByVal sender As Object, ByVal e As
> EventArgs)
> Dim lText As Literal = CType(sender, Literal)
> Dim lvdiContainer As ListViewDataItem =
> CType(lText.NamingContainer, ListViewDataItem)
> lText.Text = DataBinder.Eval(lvdiContainer.DataItem, "Text")
> End Sub
>
> Public Sub New(ByVal type As TemplateType)
> Me.Type = type
> End Sub
>
> Private Sub EditItemTemplate(ByVal container As Control)
>
> Dim form As New HtmlTableCell
> form.ColSpan = 3
>
> Dim a As New Button
> a.CommandName = "Cancel"
> a.CommandArgument = ""
> a.Text = "Cancel"
> Dim b As New Button
> b.CommandName = "Update"
> b.CommandArgument = ""
> b.Text = "Update"
> Dim c As New TextBox
> c.ID = "tbTag"
> AddHandler c.DataBinding, AddressOf c_DataBinding
> form.Controls.Add(a)
> form.Controls.Add(b)
> form.Controls.Add(c)
>
> Dim tag As New HtmlTableRow
> tag.Controls.Add(form)
>
> container.Controls.Add(tag)
>
> End Sub
>
> Private Sub ItemTemplate(ByVal container As Control)
>
> Dim lbDelete As New LinkButton
> AddHandler lbDelete.Init, AddressOf lbDelete_Init
>
> Dim lbEdit As New LinkButton
> AddHandler lbEdit.Init, AddressOf lbEdit_Init
>
> Dim lText As New Literal
> AddHandler lText.DataBinding, AddressOf lText_DataBinding
>
> Dim command As New HtmlTableCell
> command.Attributes.Add("class", "Command")
> With command.Controls
> .Add(lbEdit)
> .Add(lbDelete)
> End With
>
> Dim text As New HtmlTableCell
> text.Controls.Add(lText)
>
> Dim tag As New HtmlTableRow
> tag.Cells.Add(text)
> tag.Cells.Add(command)
>
> container.Controls.Add(tag)
>
> End Sub
>
> Private Sub LayoutTemplate(ByVal container As Control)
> Dim command As New HtmlTableCell("th")
> command.Attributes.Add("class", "Command")
> command.InnerHtml = " "
> Dim text As New HtmlTableCell("th")
> text.InnerHtml = "Tag"
> Dim fields As New HtmlTableRow
> With fields.Cells
> .Add(text)
> .Add(command)
> End With
> Dim body As New HtmlGenericControl("tbody")
> body.ID = "itemPlaceholder"
> Dim table As New HtmlGenericControl("table")
> table.ID = "tTags"
> table.Controls.Add(body)
> End Sub
>
> Private Sub c_DataBinding(ByVal sender As Object, ByVal e As
> EventArgs)
> Dim c As TextBox = CType(sender, TextBox)
> Dim lvdiContainer As ListViewDataItem = CType(c.NamingContainer,
> ListViewDataItem)
> c.Text = DataBinder.Eval(lvdiContainer.DataItem, "Text")
> End Sub
>
> End Class