What’s new in C# 10 version

Introduction

Subsequently your valuable go through our different articles like Open Souce Quartz job handler, MVC, 7 best Android cleaner apps and many more, it’s time
to go through the latest version of C# 10 that is recently released by
Microsoft. The most crucial thing is that C# 10 is supported on the .NET 6
application and it has added several improvements to the previous version for
better utility.

The regular C# professionals can download the latest version of the .NET 6 SDK
package from the .NET downloads page or Visual Studio 2022 to work with C# 10.

Table of
Content

Advanced Features of C# 10

Following are the latest features of C# 10, incorporated by Microsoft to ease
the advanced development task.

The main significant feature of this version of c# 10 is it has brought a big
improvement in the structure of records through the use of the ‘record struct’
or declaration of ‘read-only record struct’.

Here, a record is a reference type with the record class.

An instance parameterless constructor can be declared in a structure type and
an instance field or property can be initiated properly at its declaration.

Also, keep in mind that a left-hand operand of the ‘with expression’ could be
of any type of structure or any unspecified type of reference.

The interpolated string handler helps in making a type that assembles the
resulting string from an interpolated string manifestation. This string
handler converts an interpolated string into a string that can be used for
argument purposes. The .NET core libraries get utilized this feature in
various APIs.

In C# 10, const strings may be initiated through string interpolation if all
the placeholders are constant strings. In this advanced version of C#10, the
String interpolation can build more readable constant strings as you create
constant strings in your current application. Also, the placeholder
expressions couldn’t be numeric constants as those constants are changed to
strings at run time. Probably, the current culture may put an impact on their
string articulation.

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In version c# 10, the global modifier with ‘using directive’ notifies the
compiler about the application of directive to all source files in the
compilation. These are all source files in a specific project.

In the c# 10, the developers would get a chance to use a new advanced aspect
of the namespace declaration to get declared that all declarations that pursue
are members of the same declared namespace:

namespace MyNamespace;

The
above newly developed syntax ultimately saves space for namespace declarations
both horizontally and vertically. Hence, the space issues for the developers
will be resolved definitely.

With C# 10, you can refer to the nested properties or fields within a specific
property pattern.

For illustration, a pattern of the for

Prop1.Prop2: pattern

is valid in version C# 10 and later versions.

Whereas, an equivalent pattern

Prop1: Prop2: pattern

Is valid in version C# 8.0 and later versions.

C# 10 includes the sealed modifier that can be added at the time of overriding
ToStringin a record type. Sealing the ToString technique restricts the
compiler from processing a ToString method for any obtained record types.
Mostly,
a sealedToString makes sure all obtained records utilize the ToString method
interpreted in a genuine base record category.

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C# 10 includes many enhancements in lambda expressions as follows.

1. Lambda expressions might possess a natural type, where the compiler could
   interpret a delegate type from the lambda expression or group of methods.
2. Also, Lambda expressions might declare a return type if the compiler is
   unable to interpret it.
3. In c# 10, Attributes apply to the lambda expressions.

The above features in C# 10 bring similarity of lambda expressions to usual
methods and local functions. Also, these features make it easier to utilize
lambda expressions without a declaration of a delegate type variable and work
more efficiently with the new c# and ASP.Net Core Minimal APIs.

This update eliminates a constraint from previous versions of C#. In past, a
deconstruction could assign all values to current variables, or initiate
recently declared variables:

Before C# 10, there were several strategies where substantial assignment and
null-state analysis generated warnings that were false positives. Usually,
these involved comparisons to boolean values, calling a variable only in the
true or false statements in an if statement, and null coalescing embodiments.
These examples provoked warnings in previous versions of C#9.0, but not in C#
10:

The crucial impact of this advancement is that the warnings for a particular
assignment and null-state calculation are more adequate.

In C# 10 and later versions of c#, you can mention various async method
builders for a particular single method, to stipulate the method builder type
for all types of methods that return a rendered task-like type. A customized
async method builder facilitates progressive performance tuning strategies
where a bestowed method may boost up from a custom builder.

In c#10, You can utilize ‘the
system.Runtime.CompilerServices.CallerArgumentExpressionAttribute’ to mention
a parameter that the compiler replaces with another argument’s text
representation. Hence, the libraries can create more distinct diagnostics
throughout this feature.

Example

The following c# code tests a distinct condition. If the condition becomes
false, the exception message possesses the argument’s text representation
given to the condition:

C# 10 aids a new type configuration for the #line pragma. You may not use the
new format, but you’ll see its valuable effects. This enhancement facilitates
more fine-grained outcomes in domain-specific languages (DSL) in ASP.Net.

For example Razor. The Razor engine utilizes these improvements to enrich the debugging
experience. Also, the debuggers can bring out your Razor source accurately.

The warning wave 6 feature of c# 10 helps in the correction of inconsistencies
between partial method CLR signatures. Now the compiler reports cs8826 when
the signatures are syntactically different in C# 10.

Conclusion

In sum c# 10 has brought significant enhancement in c# development. Record
struct is one of the major improvements that emphasize the c# programming
experience.