Store read-only calculated field with Entity Framework Code First

Question

I am using Entity Framework Code First, and I have an entity defined with a StartTime property, an EndTime property and a Duration pro

Answer 1

Inspired by Slauma's answer, I was able to achieve what I was aiming for by using a protected setter. This persisted the value back to the database but didn't allow the value to be modified elsewhere.

My property now looks like this:

public int Duration
{
    get
    {
        return (int)this.EndTime.Subtract(this.StartTime).TotalMinutes;
    }
    protected set {}
}

Answer 2

Supplying an empty setter might be a possible solution (although then the property isn't readonly anymore, of course):

public int Duration
{
    get
    {
        return (int)this.EndTime.Subtract(this.StartTime).TotalMinutes;
    }
    set { }
}

As far as I know, readonly properties are not mappable to a column in the database.