DesignerCollection.cs

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using System.Collections;
 
namespace System.ComponentModel.Design;
 
public class DesignerCollection : ICollection, IEnumerable
{
    private readonly IList _designers;
 
    public int Count => _designers.Count;
 
    public virtual IDesignerHost? this[int index] => (IDesignerHost)_designers[index];
 
    int ICollection.Count => Count;
 
    bool ICollection.IsSynchronized => false;
 
    object ICollection.SyncRoot => null;
 
    public DesignerCollection(IDesignerHost[]? designers)
    {
        if (designers != null)
        {
            _designers = new ArrayList(designers);
        }
        else
        {
            _designers = new ArrayList();
        }
    }
 
    public DesignerCollection(IList? designers)
    {
        _designers = designers ?? new ArrayList();
    }
 
    public IEnumerator GetEnumerator()
    {
        return _designers.GetEnumerator();
    }
 
    void ICollection.CopyTo(Array array, int index)
    {
        _designers.CopyTo(array, index);
    }
 
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}