ListSortDescriptionCollection.cs

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using System.Collections;
 
namespace System.ComponentModel;
 
public class ListSortDescriptionCollection : IList, ICollection, IEnumerable
{
    private readonly ArrayList _sorts = new ArrayList();
 
    public ListSortDescription? this[int index]
    {
        get
        {
            return (ListSortDescription)_sorts[index];
        }
        set
        {
            throw new InvalidOperationException(System.SR.CantModifyListSortDescriptionCollection);
        }
    }
 
    bool IList.IsFixedSize => true;
 
    bool IList.IsReadOnly => true;
 
    object? IList.this[int index]
    {
        get
        {
            return this[index];
        }
        set
        {
            throw new InvalidOperationException(System.SR.CantModifyListSortDescriptionCollection);
        }
    }
 
    public int Count => _sorts.Count;
 
    bool ICollection.IsSynchronized => true;
 
    object ICollection.SyncRoot => this;
 
    public ListSortDescriptionCollection()
    {
    }
 
    public ListSortDescriptionCollection(ListSortDescription?[]? sorts)
    {
        if (sorts != null)
        {
            for (int i = 0; i < sorts.Length; i++)
            {
                _sorts.Add(sorts[i]);
            }
        }
    }
 
    int IList.Add(object value)
    {
        throw new InvalidOperationException(System.SR.CantModifyListSortDescriptionCollection);
    }
 
    void IList.Clear()
    {
        throw new InvalidOperationException(System.SR.CantModifyListSortDescriptionCollection);
    }
 
    public bool Contains(object? value)
    {
        return ((IList)_sorts).Contains(value);
    }
 
    public int IndexOf(object? value)
    {
        return ((IList)_sorts).IndexOf(value);
    }
 
    void IList.Insert(int index, object value)
    {
        throw new InvalidOperationException(System.SR.CantModifyListSortDescriptionCollection);
    }
 
    void IList.Remove(object value)
    {
        throw new InvalidOperationException(System.SR.CantModifyListSortDescriptionCollection);
    }
 
    void IList.RemoveAt(int index)
    {
        throw new InvalidOperationException(System.SR.CantModifyListSortDescriptionCollection);
    }
 
    public void CopyTo(Array array, int index)
    {
        _sorts.CopyTo(array, index);
    }
 
    IEnumerator IEnumerable.GetEnumerator()
    {
        return _sorts.GetEnumerator();
    }
}