Which version of the C# compiler introduced nullable types?

Question

My C# code is being run in a older version of C# (4.0.30319.34209) than in my own development environment. I am wondering if my usage of nullable types will work on this older version of C#. Does anyone know what version of C# nullable types were introduced in? My "Google-fu" came up with nothing.

Dont you compile your code against the version you need to target? — Magnus, Dec 14 '18 at 14:00
C# 2.0: http://www.tutorialsteacher.com/csharp/csharp-nullable-types — Jim Mischel, Dec 14 '18 at 14:01
side note: you need to be *very* clear in your nomenclature - the C# version and the .NET version *are not strongly linked* - the title asks about the .NET version, but the body asks about the language version; these *need not be related* — Marc Gravell, Dec 14 '18 at 14:03
Thanks for correcting me. The 4.0.30319.34209 refers to the compiler version. — webworm, Dec 14 '18 at 14:04
I am looking to see what version of the C# compiler my code needs to target to support nullable types — webworm, Dec 14 '18 at 14:11

score 6 · Accepted Answer · answered Dec 14 '18 at 14:00

6

Nullable types are §19.5 in the C# 2.0 specification, so: .NET 2.0 and C# 2.0 (it can't have been earlier, as it depends on "generics", which is definitely 2.0)

answered Dec 14 '18 at 14:00

Marc Gravell

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score 2 · Answer 2 · answered Dec 14 '18 at 14:02

2

From here, Nullable appllies to:

.NET Core
2.2 2.1 2.0 1.1 1.0

.NET Framework
4.8 4.7.2 4.7.1 4.7 4.6.2 4.6.1 4.6 4.5.2 4.5.1 4.5 4.0 3.5 3.0 2.0

.NET Standard
2.0 1.6 1.5 1.4 1.3 1.2 1.1 1.0

Xamarin.Android
7.1

Xamarin.iOS
10.8

Xamarin.Mac
3.0

answered Dec 14 '18 at 14:02

Yurii N.

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score 0 · Answer 3 · answered Dec 14 '18 at 14:01

0

C# 2.0 introduced nullable types that allow you to assign null to value type variables. You can declare nullable types using Nullable where T is a type.

Copied from here: http://www.tutorialsteacher.com/csharp/csharp-nullable-types

answered Dec 14 '18 at 14:01

andreasnico

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score 0 · Answer 4 · answered Dec 14 '18 at 14:01

0

Here is a history of C# versions: https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-version-history It states that nullable types were introduced in C# v2.0. Hope it helps.

answered Dec 14 '18 at 14:01

w0ns88

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Which version of the C# compiler introduced nullable types?

4 Answers4