StrongTypedId

A super small library for providing strong typed Ids (as opposed to using primitives).

The benefit of this is simple: You don't run the risk of accidentally using the wrong type of id. (e.g. sending a UserId into a query for products)

This works through the use of an abstract base class (StrongTypedId<TStrongTypedId, TPrimitiveId>) which is inherited to gain the id functionality.

This project is inspired by Andrew Lock's StronglyTypedId. However I needed support for .Net 5 and thus this project was born. It has since evolved to .Net 7.

Installation

I recommend using the NuGet package: StrongTypedId however feel free to clone the source instead if that suits your needs better.

Usage

Specify your class like this:

[TypeConverter(typeof(StrongTypedValueTypeConverter<UserId, Guid>))]
[StrongTypedIdJsonConverter<UserId, Guid>]
public class UserId: StrongTypedId<UserId, Guid>
{
	public UserId(Guid value) : base(value)
	{
	}
}

This specifies that the class UserId is in fact a Guid and can be used in place of a Guid. And that's basically all there is to it, now you just use UserId in place of Guid where you're dealing with an User's Id.

You can omit the JsonConverter if you don't use json serialization as well as the TypeConverter if you're not using WebAPI or MVC.

Furthermore there are a couple of base classes available to you:

• StrongTypedValue for anything that's not an id, this supports string as a primitive value.
• StrongTypedId for anything that IS an id, this only supports struct types as primitives (therefore no strings).
  • Adds the static Parse(string) and TryParse(string, out TStrongTypedId) methods.
• StrongTypedGuid a further specialization of StrongTypedId.
  • Adds the static New() method for instantiating new ids with random values as well as the static Empty property.

Finally you can recognize a StrongTyped value by calling the extension method IsStrongTypedValue(). All strong typed values furthermore implements both IStrongTypedValue<TPrimitiveValue> as well as IStrongTypedValue (The latter being strictly a marker interface).

Compatibility

Dapper.DDD.Repository

This can work without any extensions, however it's a bit simpler to use via the package StrongTypedId.Dapper.DDD.Repository.

Entity Framework

This is supported through the package StrongTypedId.EntityFrameworkCore.

WebAPI

This is supported through the use of the built-in JsonConverter and TypeConverter.

MVC

This is supported through the use of the built-in TypeConverter.

NewtonSoft.Json

This is supported through the package StrongTypedId.NewtonSoft.

Swagger

This is supported through the package StrongTypedId.Swagger.