Problem with entity passed as argument

Question

Hello !
I have this code :
Public Class myclass
Private cont As MyentEntities
Public Sub New( ByRef cnx As MyentEntities)
cont = cnx
End Sub
Public Sub test
If cont.mytable1.Count=1 then
end if
End Sub
End class
'On my main form :
Dim E1 as MyEntEntities
Dim m1 as myclass
Private Sub MainForm_Load(sender As System.Object, e As System.EventArgs) Handles Me.Load
E1=New MyentEntities
m1=new MyClass(E1)
End Sub
Private sub fill_entity
E1.MyTable1.Tolist
End sub
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
m1.test
End Sub
When I click the button , I get an error :
....the entity of type 'MyTable1'  does not exist in the context.
But I passed E1 with ByRef ?
What's wrong ?
Thank you !

Answer 1

Hello,
>>Problem with entity passed as argument
With your provided code, I tested with my database, it is ok, below is the test demo which is similar with yours except the used databse:
Public Class Form1
Dim E1 As DFDBEntities
Dim m1 As TestClass
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
E1 = New DFDBEntities
m1 = New TestClass(E1)
End Sub
Private Sub fill_entity()
E1.Orders.Tolist()
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
m1.test()
End Sub
End Class
Public Class TestClass
Private cont As DFDBEntities
Public Sub New(ByRef cnx As DFDBEntities)
cont = cnx
End Sub
Public Sub test()
If cont.Orders.Count = 1 Then
End If
End Sub
End Class
Since we do not know your exact table structure, it is hard to know why this exception is thrown in your side, one reason I know is the .edmx file is not mapped correctly, you could check this link which describes various possibilities for the
caused reason of this exception:
http://stackoverflow.com/questions/5634392/ef-4-1-code-first-error-the-entity-type-sometype-is-not-part-of-the-model-for
Or you could provide information as what database you are using, the table you are working with and the Entity Framework version.
Regards.
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