QueryResults.cs

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using System.Collections;
using System.Collections.Generic;
 
namespace System.Linq.Parallel;
 
internal abstract class QueryResults<T> : IList<T>, ICollection<T>, IEnumerable<T>, IEnumerable
{
    internal virtual bool IsIndexible => false;
 
    internal virtual int ElementsCount
    {
        get
        {
            throw new NotSupportedException();
        }
    }
 
    public T this[int index]
    {
        get
        {
            return GetElement(index);
        }
        set
        {
            throw new NotSupportedException();
        }
    }
 
    public int Count => ElementsCount;
 
    bool ICollection<T>.IsReadOnly => true;
 
    internal abstract void GivePartitionedStream(IPartitionedStreamRecipient<T> recipient);
 
    internal virtual T GetElement(int index)
    {
        throw new NotSupportedException();
    }
 
    int IList<T>.IndexOf(T item)
    {
        throw new NotSupportedException();
    }
 
    void IList<T>.Insert(int index, T item)
    {
        throw new NotSupportedException();
    }
 
    void IList<T>.RemoveAt(int index)
    {
        throw new NotSupportedException();
    }
 
    void ICollection<T>.Add(T item)
    {
        throw new NotSupportedException();
    }
 
    void ICollection<T>.Clear()
    {
        throw new NotSupportedException();
    }
 
    bool ICollection<T>.Contains(T item)
    {
        throw new NotSupportedException();
    }
 
    void ICollection<T>.CopyTo(T[] array, int arrayIndex)
    {
        throw new NotSupportedException();
    }
 
    bool ICollection<T>.Remove(T item)
    {
        throw new NotSupportedException();
    }
 
    IEnumerator<T> IEnumerable<T>.GetEnumerator()
    {
        for (int index = 0; index < Count; index++)
        {
            yield return this[index];
        }
    }
 
    IEnumerator IEnumerable.GetEnumerator()
    {
        return ((IEnumerable<T>)this).GetEnumerator();
    }
}