ObjectDataSource error

  • Thread starter Thread starter shapper
  • Start date Start date
S

shapper

Hello,

I am creating a ListView with an ObjectDataSource and Linq. However I
am getting an error:

ObjectDataSource 'odsTags' could not find a non-generic method
'GetTags' that has no parameters.

The GetTags function is there! Here is my code:

Private Sub lvTags_Init(ByVal sender As Object, ByVal e As
EventArgs) Handles lvTags.Init

With lvTags
.DataKeyNames = New String() {"TagID"}
.DataSourceID = "odsTags"
.ID = "lvTags"
.InsertItemPosition = InsertItemPosition.FirstItem
.EditItemTemplate = New
TagsTemplate(TemplateType.EditItemTemplate)
.InsertItemTemplate = New
TagsTemplate(TemplateType.InsertItemTemplate)
.ItemTemplate = New TagsTemplate(TemplateType.ItemTemplate)
.LayoutTemplate = New
TagsTemplate(TemplateType.LayoutTemplate)
End With

End Sub

Private Sub odsTags_Init(ByVal sender As Object, ByVal e As
EventArgs) Handles odsTags.Init
With odsTags
.ID = "odsTags"
.SelectMethod = "GetTags"
.TypeName = "Tag"
End With
End Sub

Public Shared Function GetTags() As ICollection

Dim database As New CodeDataContext
Dim tags = From t In database.Tags _
Select t.TagID, _
t.Text, _
Active = t.FilesTags.Any Or
t.ArticlesTags.Any
Return tags

End Function

What am I doing wrong?

I suspect it might be because of

..TypeName = "Tag"

But if I don't use this I get the following error:

A type must be specified in the TypeName property of ObjectDataSource
'odsTags'.

Thank You,

Miguel
 
Hello,

I am creating a ListView with an ObjectDataSource and Linq. However I
am getting an error:

ObjectDataSource 'odsTags' could not find a non-generic method
'GetTags' that has no parameters.

The GetTags function is there! Here is my code:

Private Sub lvTags_Init(ByVal sender As Object, ByVal e As
EventArgs) Handles lvTags.Init

With lvTags
.DataKeyNames = New String() {"TagID"}
.DataSourceID = "odsTags"
.ID = "lvTags"
.InsertItemPosition = InsertItemPosition.FirstItem
.EditItemTemplate = New
TagsTemplate(TemplateType.EditItemTemplate)
.InsertItemTemplate = New
TagsTemplate(TemplateType.InsertItemTemplate)
.ItemTemplate = New TagsTemplate(TemplateType.ItemTemplate)
.LayoutTemplate = New
TagsTemplate(TemplateType.LayoutTemplate)
End With

End Sub

Private Sub odsTags_Init(ByVal sender As Object, ByVal e As
EventArgs) Handles odsTags.Init
With odsTags
.ID = "odsTags"
.SelectMethod = "GetTags"
.TypeName = "Tag"
End With
End Sub

Public Shared Function GetTags() As ICollection

Dim database As New CodeDataContext
Dim tags = From t In database.Tags _
Select t.TagID, _
t.Text, _
Active = t.FilesTags.Any Or
t.ArticlesTags.Any
Return tags

End Function

What am I doing wrong?

I suspect it might be because of

.TypeName = "Tag"

But if I don't use this I get the following error:

A type must be specified in the TypeName property of ObjectDataSource
'odsTags'.

Thank You,

Miguel
Click to expand...

Hello,

It seems there are almost no real documentation online on using a
ObjectDataSource with Linq!

This is the only one I found that helped me:

http://msdn2.microsoft.com/en-us/library/bb907622.aspx

I am quoting one part of it:

"You can use the ObjectDataSource control with a LINQ to SQL class.
To do so, you set the TypeName property to the name of the data-
context class."

This was what solved my problem.

But the following is still a problem:

"You also set the SelectMethod, UpdateMethod, InsertMethod, and
DeleteMethod methods to the methods in the data-context class that
perform the corresponding operations."

What methods in the data-context?

I can't find it. I generated using the Linq to SQL classes. Any idea?

And finally this one beats me:

"When you use deferred query execution with the ObjectDataSource
control, you must create an event handler for the ObjectDisposing
event in order to cancel disposing of the data-context class. This
step is necessary because LINQ to SQL supports deferred execution,
whereas the ObjectDataSource control tries to dispose the data context
after the Select operation."

Any idea?

Thanks,

Miguel
 
Hello,

It seems there are almost no real documentation online on using a
ObjectDataSource with Linq!

This is the only one I found that helped me:

http://msdn2.microsoft.com/en-us/library/bb907622.aspx

I am quoting one part of it:

"You can use the ObjectDataSource control with a LINQ to SQL class.
To do so, you set the TypeName property to the name of the data-
context class."

This was what solved my problem.

But the following is still a problem:

"You also set the SelectMethod, UpdateMethod, InsertMethod, and
DeleteMethod methods to the methods in the data-context class that
perform the corresponding operations."

What methods in the data-context?

I can't find it. I generated using the Linq to SQL classes. Any idea?

And finally this one beats me:

"When you use deferred query execution with the ObjectDataSource
control, you must create an event handler for the ObjectDisposing
event in order to cancel disposing of the data-context class. This
step is necessary because LINQ to SQL supports deferred execution,
whereas the ObjectDataSource control tries to dispose the data context
after the Select operation."

Any idea?

Thanks,

Miguel
Click to expand...

Correction,

I wasn't able to solve my problem.

Do I need to place the Select, Insert, ... Methods inside my
DataContext?

Thanks,

Miguel
 
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