Question

Is there a way to sort EntityQuery using property name strings?

Seriously, I have an EntityQuery and the name of a property. I need to call OrderBy with only the name of a property. How can I do this? Reflection gives me the following exception:

System.NotSupportedException: Method
‘GetValue’ on type
‘System.Reflection.PropertyInfo’ is
not accessible. Only methods on
primitive types, System.Math and
System.Convert are supported in
queries.

Answer 1

You have to build an expression tree like this.

Type entityType = typeof(T);
var px = Expression.Parameter(entityType,"x");
var ex = Expression.Property(px, propertyName);

var lx = Expression.Lambda<Expression<Func<T>>(ex,px);

var q //.. Entity Query

q = q.OrderBy(lx);

You should replace T with your type, this is not generics example.