C#/LINQ: How to define generically a keySelector for a templated class before calling OrderBy
- by PierrOz
Hi Folks,
I have the following class defined in C#
class myClass<T,U>
{
public T PropertyOne { get; set; }
public U PropertyTwo { get; set; }
}
I need to write a function that reorder a list of myClass objects and takes two other parameters which define how I do this reorder: does my reordering depend on PropertyOne or PropertyTwo and is it ascending or descending. Let's say this two parameters are boolean. With my current knowledge in LINQ, I would write:
public IList<myClass<T,U>> ReOrder(IList<myClass<T,U>> myList, bool usePropertyOne, bool ascending)
{
if (usePropertyOne)
{
if (ascending)
{
return myList.OrderBy(o => o.PropertyOne).ToList();
}
else
{
return myList.OrderByDescending(o => o.PropertyOne).ToList();
}
}
else
{
if (ascending)
{
return myList.OrderBy(o => o.PropertyTwo).ToList();
}
else
{
return myList.OrderByDescending(o => o.PropertyTwo).ToList();
}
}
}
What could be a more efficient/elegant way to do that ? How can I declare the Func,TResult keySelector object to reuse when I call either OrderBy or OrderByDescending? I'm interesting in the answer since in my real life, I can have more than two properties.
