Aishwarya Clement

Since C# version 7 you can use the is keyword for the null check like in the snippet below:

But with C# 7, there’s even a shorter syntax. Discards were also introduced. They are unused and ignored variables that are represented in your code with an underscore (_). In combination with the Null-coalescing operator (??) you can write the null check like this:

That means, the whole method looks just like this:

To be honest, I really like the last approach using the discards, but maybe for some developers it’s too much. I think the is keyword is very clear and readable. It is my favorite.

The is keyword has also the big advantage that it ignores any ==/!= operator overloads on the specific class. It will do a null check, no matter if there’s an operator overload or not. That makes it better than just using ==. You can read more about this in this blog post.

With C# 9.0, you can combine the is expression with the logical not pattern, which is powerful if you want to check if an object is NOT null. Before C# 9.0 you had to use the is expression like below to check if an object is not null:

Some developers preferred the following syntax to check if the name is not null:

But the statements above are neither very readable nor easy to understand. That’s why many developers still prefer the classic way:

But since C# 9.0, you can write that not null check like below, and I think that is really readable code:

So, with C# 9.0, you can write your null / not-nulll checks like below, and I think that’s readable:

Happy coding,Thomas

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