Creating a LINQ Expression where parameter equals object

Question

Given a primitive value age I know how to create an expression like this:

//assuming: age is an int or some other primitive type
employee => empl         


        

Answer 1

You can't do that because EF doesn't know how to translate equality comparisons on Location into a SQL expression.

However, if you know what properties of Location you want to compare, you can do this with anonymous types:

var location = GetCurrentLocation();
var locationObj = new { location.LocationName, location.LocationDescription };
employees = DataContext.Employees.Where(e => new { e.Location.LocationName, e.Location.Description } == locationObj);

Of course that's equivalent to:

var location = GetCurrentLocation();
employees = DataContext.Employees.Where(e => e.Location.LocationName == location.Name && 
                                             e.Location.Description == location.Description);