Simple dictionary binder for wpf.

DictionaryBinder.cs

using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace Std
{
	public class DictionaryBinder : INotifyPropertyChanged
	{
		public event PropertyChangedEventHandler PropertyChanged;

		private readonly Dictionary<string, string> _dictionary;

		public DictionaryBinder(string key, Dictionary<string, string> dictionary)
		{
			Key = key;
			_dictionary = dictionary;
		}

		public string Key { get; }

		public string Value
		{
			get
			{
				string value;
				if (!_dictionary.TryGetValue(Key, out value))
				{
					return null;
				}
				return value;
			}
			set
			{
				if (_value == value)
				{
					return;
				}

				if (_dictionary.ContainsKey(Key))
				{
					_dictionary.Add(Key, value);
				}
				else
				{
					_dictionary[Key] = value;
				}

				OnPropertyChanged();
			}
		}

		protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
		{
			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
		}
	}
}