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Editorial Team
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Asked: 2026-05-24T03:11:15+00:00

We all know the 15 common value types that exists in C#: sbyte, short,

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We all know the 15 common value types that exists in C#: 

sbyte, short, int, long, byte, ushort, uint, ulong, char, float, double, decimal, bool, enum, struct

If you count nullable counterpart separately, it makes them 30.

I remember one of the MS certification books mentioning that “there are over 400 builtin value types in CLR”, although I cannot find any references to it online, nor have I found anyone else mentioning it.

So I’m curious to know – is that all? If not, how do you find the rest and have you used them in any project?

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1 Answer

  1. Editorial Team

    I suspect it means “in the .NET framework” rather than “in the CLR”. (C# defines relatively few. Note that enum and struct themselves aren’t types. The CLR itself knows of even fewer – it doesn’t have any special support for decimal for example.)

    Your list doesn’t include things like DateTime, TimeSpan, Guid, List<T>.Enumerator etc. Basically you could load a bunch of assemblies with reflection to find more. I suspect the certification guide really meant the set of value types in the framework.

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