StringDictionaryWrapper.cs

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using System.Collections.Generic;
 
namespace System.Collections.Specialized;
 
internal sealed class StringDictionaryWrapper : StringDictionary
{
    private readonly DictionaryWrapper _contents;
 
    public override string this[string key]
    {
        get
        {
            return _contents[key];
        }
        set
        {
            _contents[key] = value;
        }
    }
 
    public override int Count => _contents.Count;
 
    public override ICollection Keys => ((IDictionary)_contents).Keys;
 
    public override ICollection Values => ((IDictionary)_contents).Values;
 
    public override bool IsSynchronized => false;
 
    public override object SyncRoot => _contents.SyncRoot;
 
    public StringDictionaryWrapper(DictionaryWrapper contents)
    {
        _contents = contents;
    }
 
    public override void Add(string key, string value)
    {
        if (_contents.ContainsKey(key))
        {
            throw new ArgumentException();
        }
        _contents.Add(key, value);
    }
 
    public override void Clear()
    {
        _contents.Clear();
    }
 
    public override bool ContainsKey(string key)
    {
        return _contents.ContainsKey(key);
    }
 
    public override bool ContainsValue(string value)
    {
        return _contents.ContainsValue(value);
    }
 
    public override void CopyTo(Array array, int index)
    {
        _contents.CopyTo(array, index);
    }
 
    public override IEnumerator GetEnumerator()
    {
        foreach (KeyValuePair<string, string> content in _contents)
        {
            yield return new DictionaryEntry(content.Key, content.Value);
        }
    }
 
    public override void Remove(string key)
    {
        _contents.Remove(key);
    }
}