Question

I Have the following code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace QQQ.Mappings
{
    interface IExcess<T>
    {
        IEnumerable<string, T> getExcessByMaterialGroup(T[] data);
        void Sort<TKey>(T[] data, Func<T, TKey> selector);
    }
}

But I’m getting this error, “Using the generic type ‘System.Collections.Generic.IEnumerable’ requires ‘1’ type arguments”

Answer 1

You are attempting to return IEnumerable<string, T> from getExcessByMaterialGroup. IEnumerable<T> only takes one type parameter, not two (String and T). My guess is that you want to return something like IEnumerable<KeyValuePair<String, T>>