In this article, we’ll look at some most important C#10 features
- Global Using Statements:
Adding using statements for some common libraries and namespaces like “System.Collections.Generic” or “System.Threading.Tasks” would be somehow frustrated, especially in middle level and big projects.
Now C# 10 comes with 2 cool features to ease this pain, One of them is using “global” modifier before a using statement in a separate .cs file.
global using System.Collections.Generic;
and the second cool way is adding it in your .csproj file by
<Using Include=”System.Collections.Generic”/>
but don’t forget to enable ImplicitUsings in .csproj.
- File scope namespaces:
In previous versions of C#, using different namespaces was allowed, so you’d have something like this in your code file
namespace Linkedin
{
class WriteArticle
{…}
}
namespace Instagram
{
class Post
{…}
}
But in during more than 8 years of developing C#, I’ve never seen such a code file, and luckily c# developers found out that and add a possibility to have a single namespace in file scope, which led to code much being easier to read and decrease code lines:
using Linkedin;
class WriteArticle
{…}
- Able to use string interpolation in Const variables
Before c#10 it wasn’t possible to use string interpolation if the variable was constant like this:
const string Interpolated=$”{…}Mystring”
but now it’s possible to define such a beautiful constant variable in c# 10.
- Ability to have generic type Attributes
In the “Preview” version of the language, We can have generic type Attributes
class RezasArticleAttribute<T> : Attribute
{…}
- Lambda return expression can be not defined
It was a huge pain when you came to writing a lambda function
func<string> HandleError = ()=> “Error handled”;
We had to define its return type clearly and then write the rest of the expression, but now simply its this code id valid
var HandleError = ()=> “Error handled”;
