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5 Tips to Improve Your Productivity in C# 8.0 by@miguel-bernard
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5 Tips to Improve Your Productivity in C# 8.0
by Miguel BernardMarch 7th, 2020
Too Long; Didn't Read
Microsoft added a lot of new syntax goodies in their latest release of C# 8.0. The index from the end operator and var var are easier to understand and shorter. Using variables are handy to make sure that disposable resources don't outlive the scope of the method where they are instantiated. Verbatim strings @ and string interpolation $ are two useful concepts to build string literals. You can now specify them in any order, and the compiler will figure it out for you.Companies Mentioned
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Introduction
Microsoft added a lot of new syntax goodies in their latest release of C# that will make you more productive, namely:Index from the end operator ^
^^var array = new[] {1,2,3,4,5};
// Before
array[array.Length - 2]; // 4
// Now this is also allowed
array[^2]; // 4For more details, please take a look at my article on .
Range operator ..
Selecting sub-arrays in C# used to imply a lot of boilerplate code. With .., there's now a super simple way to do it.e.g., Get a subarray..var array = new[] {1,2,3,4,5};
// Before
var newArray = new List<int>();
for (var i = 1; i < 3; i++)
{
newArray.Add(array[i]);
}
// Now this is also allowed
var newArray = array[1..3]; // 2,3For more details, please take a look at my article on .
Null coalescing operator ??=
??=??=// Before
var possibleNullValue = possibleNullValue ?? "default value";
// Now this is also allowed
var possibleNullValue ??= "default value";
Using variables
usingusing So why not just dispose of them at the end of the method's scope? It's what Microsoft did with the new
using var// Before
using (var stream = new FileStream("", FileMode.Open))
{
using (var sr = new StreamReader(stream))
{
...
}
}
// Now this is also allowed
using var stream = new FileStream("", FileMode.Open);
using var sr = new StreamReader(stream);
...
Verbatim string with interpolation $@
@$
and are two useful concepts to build string literals. However, if you wanted to use both on the same string literal, you had to specify them in the correct order; otherwise, you were getting an error from the compiler. Not anymore! You can now specify them in any order, and the compiler will figure it out for you.$@@$// Before
$@"This -> {nameof(this)}";
// Now this is also allowed
@$"This -> {nameof(this)}";
Closing word
I hope you enjoyed learning about these tips and tricks. If you are curious about other new features introduced with C# 8.0.All code samples are available on
Previously published at //blog.miguelbernard.com/5-tips-to-improve-your-productivity-in-c-8-0/
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