How can I avoid setting some columns if others haven't changed, when working with Linq To SQL?
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by Patrick Szalapski
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Published on 2010-05-20T18:10:31Z
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In LINQ to SQL, I want to avoid setting some columns if others haven't changed? Say I have
dim row = (From c in dataContext.Customers Where c.Id = 1234 Select c).Single()
row.Name = "Example"
' line 3
dataContext.SubmitChanges() ' line 4
Great, so LINQ to SQL fetches a row, sets the name to "Example" in memory, and generates an update SQL query only when necessary--that is, no SQL will be generated if the customer's name was already "Example".
So suppose on line 3, I want to detect if row has changed, and if so, set row.UpdateDate = DateTime.Now. If row has not changed, I don't want to set row.UpdateDate so that no SQL is generated. Is there any good way to do this?
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