Question

I have a simple row that has 4 columns:

{ [Primary Key Int]RowID, [text]Title, [text]Text, [datetime]Date }

I would like to allow the user to edit this row on a simple page that has a form with the fields “Title” and “Text”.

There is a hidden field to store the RowID.

When the user posts this form to my controller action, I want it to update the row’s Title and Text, and keep the Date the same. I don’t want to have to explicitly include a hidden field for the Date in the form page.

Here is my action:

[AcceptVerbs(HttpVerb.Post)]
public ActionResult EditRow(Row myRow)
{
    RowRepository.SaveRow(myRow)   
    return View("Success");
}

RowRepository:

public void SaveRow(Row myRow)
{
    db.MyRows.Attach(myRow);
    db.Refresh(RefreshMode.KeepCurrentValues, myRow);
    db.SubmitChanges();
}

This dosen’t keep the “Date” value already in the row and tries to insert a value that throws an timespan exception.

How can I just tell it to keep the old values?
I tried doing RefreshMode.KeepChanges and nothing.

Answer 1

Ok, I set it to nullable and it keeps overwriting the database as a null value. I guess its impossible to do this since technically null is a valid value for the column and if I pass an object to the function, the empty values must contain something or be null.

So I would have to explicitly state to take the database value for that column

Thanks