Question

I have a property in a class:

public int this[int index]
        {
            get { return _desk[index]; }
            set { _desk[index] = value; }
        }

But I cant use this class in Linq. How to make it ?

Answer 1

If your class doesn’t implement IEnumerable<T> but has an indexer and a Count property, you can create an IEnumerable of indexes using the Enumerable.Range Method, and project each index to the collection item using the Enumerable.Select Extension Method:

var query = Enumerable.Range(0, obj.Count)
                      .Select(index => obj[index])
                      ...