C# 8 Features
C# was first introduced with .NET Framework 1.0 in 2002(stable version). Since its emergence it is enhancing with each release.In September 2019 Microsoft has announced its 8th version, i.e. C# 8 with lot of new and important features.
In this article most frequently used features of C# 8.0 are described.
For more details, please check the below link:
https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8
Prerequisites
In this article I have used Visual Studio 2019 and .NET Core Version 3.0 to elaborate the C# 8 features.
Features of C# 8:
- Nullable reference types
Inside a nullable annotation context, any variable of a reference type is considered to be a nonnullable reference type. If you want to indicate that a variable may be null, you must append the type name with the? to declare the variable as a nullable reference type.To declare variable /property as Nullable, we have to add “#nullable enable “ in our code.
- Default interface methods
We can now add members to interface and provide implementation for those members.To use this feature of C# 8, we have to use .NET Core 3x which is available in Visual Studio 2019.
- Switch Statement
We can initiate switch statement in a new easy way 
Key points :
- No "case" and "break" keywords.
- colon ":" is replaced by "=>"
- default is replaced by underscore "_"
- Asynchronous streams
Now we can iterate using “await” over “async” collection
- Null – coalescing assignment
C# 8.0 introduces the null-coalescing assignment operator ??=. You can use the ??= operator to assign the value of its right-hand operand to its left-hand operand only if the left-hand operand evaluates to null.
