Question

I have a LINQ to SQL generated class with a readonly property:

<Column(Name:='totalLogins', Storage:='_TotalLogins', DbType:='Int', UpdateCheck:=UpdateCheck.Never)>  _ Public ReadOnly Property TotalLogins() As System.Nullable(Of Integer)     Get         Return Me._TotalLogins     End Get End Property 

This prevents it from being changed externally, but I would like to update the property from within my class like below:

Partial Public Class User  ...      Public Shared Sub Login(Username, Password)         ValidateCredentials(UserName, Password)          Dim dc As New MyDataContext()         Dim user As User = (from u in dc.Users select u where u.UserName = Username)).FirstOrDefault()         user._TotalLogins += 1         dc.SubmitChanges()     End Sub  ...  End Class 

But the call to user._TotalLogins += 1 is not being written to the database? Any thoughts on how to get LINQ to see my changes?

Answer 1

Set the existing TotalLogins property as either private or protected and remove the readonly attribute. You may also want to rename it e.g. InternalTotalLogins.

Then create a new property by hand in the partial class that exposes it publically as a read-only property:

Public ReadOnly Property TotalLogins() As System.Nullable(Of Integer)     Get         Return Me.InternalTotalLogins     End Get End Property