Question

I have a Classes like this:

Public class ClassA
{

public Class1[] Class1{ get; set; }

}

Public class Class1
{

public Class2[] Class2{ get; set; }
public double TotalTime1 { get; set; }

}

Public class Class2
{

public double Count{ get; set; }

}

here i am trying to sort the ClassA like below:

IList<Class1> Data = new List<Class1>();
Data = ClassA.Class1.OrderBy(m => m.Class2.OrderBy(k => k.Count)).ToList();

Please how can i sort the Class1 using the Count in Class2.

Answer 1

You are trying to sort on the result of the inner OrderBy, which is a sequence of Class2 objects and this doesn’t implement IComparable.

You have to sort on a single value, not a sequence. If you for example want to sort on the largest Count value in each Class1 object, use the Max method:

IList<Class1> Data =
  ClassA.Class1.OrderBy(m => m.Class2.Max(k => k.Count)).ToList();

There are also other plausible ways that you may want to produce a value from the Class2 array, like for example using the Min, Sum, Average or First method.