TrackingStringDictionary.cs

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using System.Collections.Specialized;
 
namespace System.Net;
 
internal sealed class TrackingStringDictionary : StringDictionary
{
    private readonly bool _isReadOnly;
 
    private bool _isChanged;
 
    internal bool IsChanged
    {
        get
        {
            return _isChanged;
        }
        set
        {
            _isChanged = value;
        }
    }
 
    public override string this[string key]
    {
        get
        {
            return base[key];
        }
        set
        {
            if (_isReadOnly)
            {
                throw new InvalidOperationException(System.SR.MailCollectionIsReadOnly);
            }
            base[key] = value;
            _isChanged = true;
        }
    }
 
    internal TrackingStringDictionary()
        : this(isReadOnly: false)
    {
    }
 
    internal TrackingStringDictionary(bool isReadOnly)
    {
        _isReadOnly = isReadOnly;
    }
 
    public override void Add(string key, string value)
    {
        if (_isReadOnly)
        {
            throw new InvalidOperationException(System.SR.MailCollectionIsReadOnly);
        }
        base.Add(key, value);
        _isChanged = true;
    }
 
    public override void Clear()
    {
        if (_isReadOnly)
        {
            throw new InvalidOperationException(System.SR.MailCollectionIsReadOnly);
        }
        base.Clear();
        _isChanged = true;
    }
 
    public override void Remove(string key)
    {
        if (_isReadOnly)
        {
            throw new InvalidOperationException(System.SR.MailCollectionIsReadOnly);
        }
        base.Remove(key);
        _isChanged = true;
    }
}