TreeSet.cs

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using System.Runtime.CompilerServices;
using System.Runtime.Serialization;
 
namespace System.Collections.Generic;
 
[Serializable]
[TypeForwardedFrom("System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public sealed class TreeSet<T> : SortedSet<T>
{
    public TreeSet()
    {
    }
 
    public TreeSet(IComparer<T>? comparer)
        : base(comparer)
    {
    }
 
    internal TreeSet(TreeSet<T> set, IComparer<T> comparer)
        : base((IEnumerable<T>)set, comparer)
    {
    }
 
    private TreeSet(SerializationInfo siInfo, StreamingContext context)
        : base(siInfo, context)
    {
    }
 
    internal override bool AddIfNotPresent(T item)
    {
        bool flag = base.AddIfNotPresent(item);
        if (!flag)
        {
            throw new ArgumentException(System.SR.Format(System.SR.Argument_AddingDuplicate, item));
        }
        return flag;
    }
}