TypeConverter ignored when creating SqlArgument

[Tobias Rummelt]

According to the wiki page on Type Converters, registering a converter via

TypeConverter.Converters.Add(new MyTypeConverter());

should be enough for converting to and from database values for a specific type. With session.Insert() it works as expected.

However, when using custom queries with arguments, only DbType mappings are considered.
I'm currently using a little helper to do the conversion for me.

public static SqlArgument GetArgument( object value )
{
    var type = value.GetType();
    var converter = TypeConverter.For( type );
    var result = converter.ConvertToDbValue( value, type );
    return new SqlArgument( result );
}

This works fine, however this might be a more common problem then just for me, so something like this could be supported by ML itself.

[Trevor Pilley]

Do you think that's something that we could just build into the SqlArgument constructor?

https://github.com/TrevorPilley/MicroLite/blob/develop/MicroLite/SqlArgument.cs#L33

I'm trying to think if that would cause a problem & I don't think it would...

[Tobias Rummelt]

Don't know enough about the workings of session.Insert and how that would effect that. It could also break code that relies on the current behavior...

Noticed another thing though, session.Fetch<MyType>(sql) where the SQL is simply SELECT * FROM MyTable also throws NotSupportedException unless a DbType mapping is registered in addition to the converter, which I don't think is intended?

[Trevor Pilley]

OK, well since you have a working solution I'll just leave this to be thought about as part of version 7 instead of trying to update 6.2.

As far as the NotSupportedException goes, can you raise that as a separate issue with enough of a code sample to repro in an empty console app? (e.g. just the class definition for MyType, the mapping configuration and the sample call to session.Fetch?

[Tobias Rummelt]

That will have to wait until Monday when I get back to work, but will do.