Deserializtion return empty object, using Filestream and Binary Formatter

Question

The problem is that i get zero count in repo when deserialize it (without any errors)

[Serializable]
class RegexRepository : Dictionary<string, string>
{
    public RegexRepository()
    {
        //this.Add("All", "ALL");
        //this.Add("Name", @"Name:(?<data>[\s\w]+)Email");
        //this.Add("Email", @"Email:(?<data>[\w\s@]+\.com)");
        //this.Add("Phone Number", "Phone:(?<data>\\d+)");
    }
    protected RegexRepository(SerializationInfo info, StreamingContext context)
    {

    }
    private static RegexRepository repo = new RegexRepository();
    public static RegexRepository Instance
    {
        get
        {
            if (repo == null)
            {
                repo = new RegexRepository();
            }
            return repo;
        }
    }
    string FileName = AppDomain.CurrentDomain.BaseDirectory + "BinaryFile.dat";
    public void Serialize()
    {
        using (FileStream ms = new FileStream(FileName, FileMode.OpenOrCreate))
        {
            var bf = new BinaryFormatter();
            bf.Serialize(ms, this);
        }
    }
    public void Deserialize()
    {
        if (System.IO.File.Exists(FileName))
        {
            using (FileStream ms = new FileStream(FileName, FileMode.Open))
            {
                var bf = new BinaryFormatter();
                repo = (RegexRepository)bf.Deserialize(ms);
               //Here i get zero count in repo, checked while debugging
            }
        }
    }
}

I have seen BinaryFile.dat is not empty and i can see some records in it. Kindly help me

Answer 1

You need to call the base constructor from your streaming constructor:

    protected RegexRepository(SerializationInfo info, StreamingContext context)
        : base(info, context)
    {
    }

Also, FileName probably should not be a field, you're allocating memory for it in your class, which is not necessary. Instead a static property would seem to make more sense:

    static string FileName
    {
        get
        {
            return AppDomain.CurrentDomain.BaseDirectory + "BinaryFile.dat";
        }
    }