Early peek at C# 11 features

Visual Studio 17.1 (Visual Studio 2022 Update 1) and .NET SDK 6.0.200 include preview features for C# 11! You can update Visual Studio or download the latest .NET SDK to get these features.

Check out the post Visual Studio 2022 17.1 is now available! to find out what’s new in Visual Studio and the post Announcing .NET 7 Preview 1 to learn about more .NET 7 preview features.

Designing C# 11

We love designing and developing in the open! You can find proposals for future C# features and notes from language design meetings in the CSharpLang repo. The main page explains our design process and you can listen to Mads Torgersen on the .NET Community Runtime and Languages Standup where he talks about the design process.

Once work for a feature is planned, work and tracking shifts to the Roslyn repo. You can find the status of upcoming features on the Feature Status page. You can see what we are working on and what’s merged into each preview. You can also look back at previous versions to check out features you may have overlooked.

For this post I’ve distilled these sometimes complex and technical discussions to what each feature means in your code.

We hope you will try out these new preview features and let us know what you think. To try out the C# 11 preview features, create a C# project and set the LangVersion to Preview. Your .csproj file might look like:

<Project Sdk=”Microsoft.NET.Sdk”>

C# 11 Preview: Allow newlines in the “holes” of interpolated strings

Read more about this change in the proposal Remove restriction that interpolations within a non-verbatim interpolated string cannot contain new-lines. #4935

C# supports two styles of interpolated strings: verbatim and non-verbatim interpolated strings ($@”” and $”” respectively). A key difference between these is that a non-verbatim interpolated strings cannot contain newlines in its text segments, and must instead use escapes (like rn). A verbatim interpolated string can contain newlines in its text segments, and doesn’t escape newlines or other character (except for “” to escape a quote itself).
All of this behavior remains the same.

Previously, these restrictions extended to the holes of non-verbatim interpolated strings. Holes is a shorthand way of saying interpolation expressions and are the portions inside the curly braces that supply runtime values. The holes themselves are not text, and shouldn’t be held to the escaping/newline rules of the interpolated string text segments.

For example, the following would have resulted in a compiler error in C# 10 and is legal in this C# 11 preview:

var v = $”Count ist: { this.Is.Really.Something()
be + able)[
to.Wrap()] }.”;

C# 11 Preview: List patterns

Read more about this change in the proposal List patterns.

The new list pattern allows you to match against lists and arrays. You can match elements and optionally include a slice pattern that matches zero or more elements. Using slice patterns you can discard or capture zero or more elements.

The syntax for list patterns are values surrounded by square brackets and for the slice pattern it is two dots. The slice pattern can be followed by another list pattern, such as the var pattern to capture the contents of the slice.

The pattern [1, 2, .., 10] matches all of the following:

int[] arr1 = { 1, 2, 10 };
int[] arr1 = { 1, 2, 5, 10 };
int[] arr1 = { 1, 2, 5, 6, 7, 8, 9, 10 };

To explore list patterns consider:

public static int CheckSwitch(int[] values)
=> values switch
[1, 2, .., 10] => 1,
[1, 2] => 2,
[1, _] => 3,
[1, ..] => 4,
[..] => 50

When it is passed the following arrays, the results are as indicated:

WriteLine(CheckSwitch(new[] { 1, 2, 10 })); // prints 1
WriteLine(CheckSwitch(new[] { 1, 2, 7, 3, 3, 10 })); // prints 1
WriteLine(CheckSwitch(new[] { 1, 2 })); // prints 2
WriteLine(CheckSwitch(new[] { 1, 3 })); // prints 3
WriteLine(CheckSwitch(new[] { 1, 3, 5 })); // prints 4
WriteLine(CheckSwitch(new[] { 2, 5, 6, 7 })); // prints 50

You can also capture the results of a slice pattern:

public static string CaptureSlice(int[] values)
=> values switch
[1, .. var middle, _] => $”Middle {String.Join(“, “, middle)}”,
[.. var all] => $”All {String.Join(“, “, all)}”

List patterns work with any type that is countable and indexable — which means it has an accessible Length or Count property and with an indexer an int or System.Index parameter. Slice patterns work with any type that is countable and sliceable — which means it has an accessible indexer that takes a Range as an argument or has an accessible Slice method with two int parameters.

We’re considering adding support for list patterns on IEnumerable types. If you have a chance to play with this feature, let us know your thoughts on it.

C# 11 Preview: Parameter null-checking

Read more about this change in the proposal Parameter null checking.

We are putting this feature into this early preview to ensure we have time to get feedback. There have been discussions on a very succinct syntax vs. a more verbose one. We want to get customer feedback and from users that have had a chance to experiment with this feature.

It is quite common to validate whether method arguments are null with variations of boilerplate code like:

public static void M(string s)
if (s is null)
throw new ArgumentNullException(nameof(s));
// Body of the method

With Parameter null checking, you can abbreviate your intent by adding !! to the parameter name:

public static void M(string s!!)
// Body of the method

Code will be generated to perform the null check. The generated null check will execute before any of the code within the method. For constructors, the null check occurs before field initialization, calls to base constructors, and calls to this constructors.

This features is independent of Nullable Reference Types (NRT), although they work well together. NRT helps you know at design time whether a null is possible. Parameter null-checking makes it easier to check at runtime whether nulls have been passed to your code. This is particularly important when your code is interacting with external code that might not have NRT enabled.

The check is equivalent if (param is null) throw new ArgumentNullException(…). When multiple parameters contain the !! operator then the checks will occur in the same order as the parameters are declared.

There are a few guidelines limiting where !! can be used:

Null-checks can only be applied to parameters when there is an implementation. For example, an abstract method parameter cannot use !!. Other cases where it cannot be used include:

extern method parameters.
Delegate parameters.
Interface method parameters when the method is not a Default Interface Method (DIM).

Null checking can only be applied to parameters that can be checked.

An example of scenarios that are excluded based on the second rule are discards and out parameters. Null-checking can be done on ref and in parameters.

Null-checking is allowed on indexer parameters, and the check is added to the get and set accessor. For example:

public string this[string key!!] { get { … } set { … } }

Null-checks can be used on lambda parameters, whether or not they are surrounded by parentheses:

// An identity lambda which throws on a null input
Func<string, string> s = x!! => x;

async methods can have null-checked parameters. The null check occurs when the method is invoked.

The syntax is also valid on parameters to iterator methods. The null-check will occur when the iterator method is invoked, not when the underlying enumerator is walked. This is true for traditional or async iterators:

class Iterators {
IEnumerable<char> GetCharacters(string s!!) {
foreach (var c in s) {
yield return c;

void Use() {
// The invocation of GetCharacters will throw
IEnumerable<char> e = GetCharacters(null);

Interaction with Nullable Reference Types

Any parameter which has a !! operator applied to its name will start with the nullable state being not-null. This is true even if the type of the parameter itself is potentially null. That can occur with an explicitly nullable type, such as say string?, or with an unconstrained type parameter.

When !! syntax on parameters is combined with an explicitly nullable type on the parameter, the compiler will issue a warning:

void WarnCase<T>(
string? name!!, // CS8995 Nullable type ‘string?’ is null-checked and will throw if null.
T value1!! // Okay


There is a small, but observable change when you change from explicit null-checks in your code to null-checks using the null validation syntax (!!). Your explicit validation occurs after field initializers, base class constructors, and constructors called using this. Null-checks performed with the parameter null-check syntax will occur before any of these execute. Early testers found this order to be helpful and we think it will be very rare that this difference will adversely affect code. But check that it will not impact your program before shifting from explicit null-checks to the new syntax.

Notes on design

You can hear Jared Parsons in the .NET Languages and Runtime Community Standup on Feb. 9th, 2022. This clip starts about 45 minutes into the stream when Jared joins us to talk more about the decisions made to get this feature into preview, and responds to some of the common feedback.

Some folks learned about this feature when they saw PRs using this feature in the .NET Runtime. Other teams at Microsoft provide important dogfooding feedback on C#. It was exciting to learn that the .NET Runtime removed nearly 20,000 lines of code using this new null-check syntax.

The syntax is !! on the parameter name. It is on the name, not the type, because this is a feature of how that specific parameter will be treated in your code. We decided against attributes because of how it would impact code readability and because attributes very rarely impact how your program executes in the way this feature does.

We considered and rejected making a global setting that there would be null-checks on all nullable parameters. Parameter null checking forces a design choice about how null will be handled. There are many methods where a null argument is a valid value. Doing this everywhere a type is not null would be excessive and have a performance impact. It would be extremely difficult to limit only to methods that were vulnerable to nulls (such as public interfaces). We also know from the .NET Runtime work that there are many places the check is not appropriate, so a per parameter opt-out mechanism would be needed. We do not currently think that a global approach to runtime null checks is likely to be appropriate, and if we ever consider a global approach, it would be a different feature.


Visual Studio 17.1 and .NET SDK 6.0.200 offer an early peek into C# 11. You can play with parameter null-checking, list patterns, and new lines within curly braces (the holes) of interpolated strings.

We hope you’ll check out the C# 11 Preview features by updating Visual Studio or downloading the latest .NET SDK, and then setting the LangVersion to preview.

We look forward to hearing what you think, here or via discussions in the CSharpLang repo on GitHub!

The post Early peek at C# 11 features appeared first on .NET Blog.

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C#11 Parameter Null Checking

Such is life on Twitter, I’ve been watching from afar .NET developers argue about a particular upcoming C# 11 feature, Parameter Null Checks. It’s actually just a bit of syntactic sugar to make it easier to throw argument null exceptions, but it’s caused a bit of a stir for two main reasons.

People don’t like the syntax full stop. Which I understand, but other features such as some of the switch statement pattern matching and tuples look far worse! So in for a penny in for a pound!
It somewhat clashes with another recent C# feature of Nullable Reference Types (We’ll talk more about this later).

The Problem

First let’s look at the problem this is trying to solve.

I may have a very simple method that takes a list of strings (As an example, but it could be any nullable type). I may want to ensure that whatever the method is given is not null. So we would typically write something like :

void MyMethod(List<string> input)
if(input == null)
throw new ArgumentNullException(nameof(input));

Nothing too amazing here. If the list is null, throw an ArgumentNullException!

In .NET 6 (Specifically .NET 6, not a specific version of C#), a short hand was added to save a few lines. So we could now do :

void MyMethod(List input)

There is no magic here. It’s just doing the same thing we did before with the null check, but wrapping it all up into a nice helper.

So what’s the problem? Well.. There isn’t one really. The only real issue is that should you have a method with many parameters, and all of them nullable, and yet you want to throw a ArgumentNullException, you might have an additional few lines at the start of your method. I guess that’s a problem to be solved, but it isn’t too much of a biggie.

Parameter Null Checking In C# 11

I put C# 11 here, but actually you can turn on this feature in C# 10 by adding the following to your csproj file :


Now we have a bit of sugar around null check by doing the following :

void MyMethod(List<string> input!!)

Adding the “!!” operator to a parameter name immediately adds an argument null check to it, skipping the need for the first few lines to be boilerplate null checks.

Just my personal opinion, it’s not… that bad. I think people see the use of symbols, such as ? or ! and they immediately get turned off. When using a symbol like this, especially one that isn’t universal across different languages (such as a ternary ?), it’s not immediately clear what it does. I’ve even seen some suggest just adding another keyword such as :

void MyMethod(notnull List<string> input)

I don’t think this is really any better to be honest.

Overall, it’s likely to see a little bit of use. But the interesting context of some of the arguments against this is….

Nullable Reference Types

C#8 introduced the concept of Nullable Reference Types. Before this, all reference types were nullable by default, and so the above checks were essentially required. C#8 came along and gave a flag to say, if I want something to be nullable, I’ll let you know, otherwise treat everything as non nullable. You can read more about the feature here : https://dotnetcoretutorials.com/2018/12/19/nullable-reference-types-in-c-8/

The interesting point here is that if I switch this flag on (And from .NET 6, it’s switched on by default in new projects), then there is no need for ArgumentNullExceptions because either the parameter is not null by default, or I specify that it can be null (And therefore won’t need the check).

Just as an example, with Nullables switched on using code :

#nullable enable
void MyMethod(List<string> input)
//Input cannot be null anyway. So no need for the check.

void MyMethod2(List<string>? input)
//Using ? I’ve specified it can be null, and if I’m saying it can be null…
//I won’t be throwing exceptions when it is null right?

There’s arguments that nullable reference types are a compile time check whereas throwing an exception is a runtime check. But the reality is they actually solve the same problem just in different ways, and if there is a push to do things one way (nullable reference types), then there’s no need for the other.

With all of that being said. Honestly, it’s a nice feature and I’m really not that fussed over it. The extent of my thinking is that it’s a handy little helper. That’s all.

The post C#11 Parameter Null Checking appeared first on .NET Core Tutorials.

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