Why is my {get; private set} variable returning an empty Dictionary?

I am trying to use a {get; private set;} for a MorseCode translator I am building right now. The MorseToText Dictionary is supposed to be built from a TextToMorse Dictionary I have already defined. For some reason my Dictionary is empty when I use it though.

    private static Dictionary<char, string> TextToMorse = new Dictionary<char, string>()
    {
        {'A', ".-" }, {'B', "-..."}, {'C', "-.-."}, {'D', "-.."}, {'E', "."}, {'F', "..-."},
        {'G', "--."}, {'H', "...."}, {'I', ".."}, {'J', ".---"}, {'K', "-.-"}, {'L', ".-.."}, {'M', "--"},
        {'N', "-."}, {'O', "---"}, {'P', ".--."}, {'Q', "--.-"}, {'R', ".-."}, {'S', "..."}, {'T', "-"},
        {'U', "..-"}, {'V', "...-"}, {'W', ".--"}, {'X', "-..-"}, {'Y', "-.--"}, {'Z', "--.." }
    };

    private static Dictionary<string, char> _MorseToText = new Dictionary<string, char>();

    public static Dictionary<string, char> MorseToText
    {
        get { return _MorseToText; }

        private set
        {
            foreach (KeyValuePair<char, string> pair in TextToMorse)
            {
                _MorseToText.Add(pair.Value, pair.Key);
            }
        }
    }

...

        for (int i = 0; i < splitInput.Length; i++)
        {
            MorseToText.TryGetValue(splitInput[i], out char value);
            output += $"{value} ";
        }