StringDictionary.cs

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using System.ComponentModel.Design.Serialization;
using System.Runtime.CompilerServices;
 
namespace System.Collections.Specialized;
 
[Serializable]
[TypeForwardedFrom("System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
[DesignerSerializer("System.Diagnostics.Design.StringDictionaryCodeDomSerializer, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.ComponentModel.Design.Serialization.CodeDomSerializer, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public class StringDictionary : IEnumerable
{
    private readonly Hashtable contents = new Hashtable();
 
    public virtual int Count => contents.Count;
 
    public virtual bool IsSynchronized => contents.IsSynchronized;
 
    public virtual string? this[string key]
    {
        get
        {
            if (key == null)
            {
                throw new ArgumentNullException("key");
            }
            return (string)contents[key.ToLowerInvariant()];
        }
        set
        {
            if (key == null)
            {
                throw new ArgumentNullException("key");
            }
            contents[key.ToLowerInvariant()] = value;
        }
    }
 
    public virtual ICollection Keys => contents.Keys;
 
    public virtual object SyncRoot => contents.SyncRoot;
 
    public virtual ICollection Values => contents.Values;
 
    public virtual void Add(string key, string? value)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        contents.Add(key.ToLowerInvariant(), value);
    }
 
    public virtual void Clear()
    {
        contents.Clear();
    }
 
    public virtual bool ContainsKey(string key)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        return contents.ContainsKey(key.ToLowerInvariant());
    }
 
    public virtual bool ContainsValue(string? value)
    {
        return contents.ContainsValue(value);
    }
 
    public virtual void CopyTo(Array array, int index)
    {
        contents.CopyTo(array, index);
    }
 
    public virtual IEnumerator GetEnumerator()
    {
        return contents.GetEnumerator();
    }
 
    public virtual void Remove(string key)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        contents.Remove(key.ToLowerInvariant());
    }
}