Get all .net available type in system namespace

Question

Is there a function or by using reflection a way to get all the System types.

Like those: - System.Int64

System.Byte[]
System.Boolean
System.String
System.Decimal
System.Double
...

We have an old enum that stores some datatype. We need to convert those to .net types.

A similar entry answering your question stackoverflow.com/questions/79693/… Hope it helps. — Fernando Soteras
– Fernando Soteras, Commented Apr 9, 2015 at 17:48

Jon Skeet · Accepted Answer · 2015-04-09 17:44:52Z

10

Assuming you only want types from mscorlib, it's easy:

var mscorlib = typeof(string).Assembly; var types = mscorlib.GetTypes() .Where(t => t.Namespace == "System");

However, that won't return byte[], as that's an array type. It also won't return types in different assemblies. If you have multiple assemblies you're interested in, you could use:

var assemblies = ...; var types = assemblies.SelectMany(a => a.GetTypes()) .Where(t => t.Namespace == "System");

answered Apr 9, 2015 at 17:44

Jon Skeet

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3 Comments

billybob Over a year ago

This returns more than what I wants. Is there a way to get only the basic once like. In fact, I'm doing a mapping between the database type and the .net types. So I need to convert an old sql column in the database by replacing the it with a .net type.

Jon Skeet Over a year ago

@billybob: Well then you should have specified exactly what you wanted. I've answered the question you asked: "Get all .net available type in system namespace" - it's really not at all clear what you really want, but it sounds like it's not what you actually asked for...

billybob Over a year ago

Thanks. I think i will just hard code the ones that I need to map with the .net type. It answers the question.

Takeshi Kosugi · Accepted Answer · 2021-04-22 08:47:18Z

@jon-skeet: Thanks a lot for your great solution!

If some complete noob (like me) reads this topic, I found a tiny tweak for Jon Skeet's code to get more specified output. For example:

 Assembly mscorlib = typeof(int).Assembly; IEnumerable<System.Type> types = mscorlib.GetTypes() .Where(t => t.Namespace == "System" && t.IsPrimitive);

The second argument "...&& t.{here_is_property}" in the last codeline is one of Type Class properties. You can try another one from .NET official reference to get what you exactly need.

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