StackOverflow exception with SisoDB while storing a FileInfo entity

Question

This questions refers to the SisoDB - an SQL-Server-based document database written in C#.

I am trying to store a FileInfo entity to the database. In order to avoid (potential) circular references I define the interface for the fields I need:

interface IFileData
{
    Guid Id { get; set; }
    string DirectoryName { get; set; }
    long Length { get; set; }
    string Name { get; set; }
}

and then try to store a FileInfo entity:

        var db = @"Data Source=C:\Temp\sisotest.sdf".CreateSqlCe4Db();
        db.EnsureNewDatabase();

        var info = new FileInfo(@"c:\config.sys");
        db.UseOnceTo().InsertAs<IFileData>(info);

This results in StackOverflow exception. Any ideas why it is so and how can I overcome this problem?

Answer 1

SisoDb relies on the performant and outstanding serialization framework of ServiceStack.Text and my first test was to see if it can serialize a FileInfo, and that's where the StackOverFlowException seems to be generated. You can try this by either using SisoDb.Serialization (which is a copy of ServiceStack.Text) or by using ServiceStack.Text directly.

var json = info.ToJson();

As of now InsertAs<T> requires T to be an interface. Insert<T> and InsertMany<T> can handle interfaces, but also requires the actual item to implement the interface.

So as of now, to get further:

1) make a class out of IFileData.

public class FileData
{
    public Guid Id { get; set; }
    public string DirectoryName { get; set; }
    public long Length { get; set; }
    public string Name { get; set; }
}

2) Normally that should have been ok, but since the FileInfo can't be serialized to JSON, you need to, either:

a) Tell the ServiceStack serializer (contained in SisoDb.Serialization) not to include the properties causing the deserialization issue:

JsConfig<FileInfo>.ExcludePropertyNames = new[]{"Directory"};

b) Or you can make FileData wrap a FileInfo

c) Or you can make a custom wrapper FileInfo2 which wraps FileInfo.

class Program
{
    static void Main(string[] args)
    {
        var db = @"Data Source=D:\Temp\sisotest.sdf".CreateSqlCe4Db();
        db.EnsureNewDatabase();

        var info = new FileInfo2(@"D:\Temp\test.txt");
        db.UseOnceTo().InsertAs<FileData>(info);
    }
}

public class FileInfo2
{
    public FileInfo2(string cConfigSys)
    {
        var f = new FileInfo(cConfigSys);
        DirectoryName = f.DirectoryName;
        Length = f.Length;
        Name = f.Name;
    }

    public string DirectoryName { get; private set; }
    public long Length { get; private set; }
    public string Name { get; private set; }
}

public class FileData
{
    public Guid Id { get; set; }
    public string DirectoryName { get; set; }
    public long Length { get; set; }
    public string Name { get; set; }
}