C# check if float is null

Well here is something I just came up with using Nullable Design Pattern. You code sample will fail. If obj is null then the obj. ToString will result in a null reference exception. I'd short cut the process and check for a null obj at the start of your helper function.

As to your actual question, what's the type you're checking for null or zero? Edit: Remember, the '? One step further from Joshua Shannon 's nice answer. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow.

Learn more. Nullable types: better way to check for null or zero in c Ask Question. Asked 12 years, 10 months ago. Active 1 month ago. Viewed k times. I'm working on a project where i find i'm checking for the following in many, many places: if item. TryParse obj. Improve this question.

TMT 1, 7 7 silver badges 14 14 bronze badges. Add a comment. Privacy policy. The null-coalescing operator?? Available in C 8. The left-hand operand of the??

Beginning with C 8. In particular, beginning with C 8. Use the null-coalescing operator?? GetValueOrDefault T method for the same purpose :. GetValueOrDefault method. You can also explicitly cast a nullable value type to a non-nullable type, as the following example shows:. At run time, if the value of a nullable value type is null , the explicit cast throws an InvalidOperationException.

A non-nullable value type T is implicitly convertible to the corresponding nullable value type T? The predefined unary and binary operators or any overloaded operators that are supported by a value type T are also supported by the corresponding nullable value type T?

These operators, also known as lifted operators , produce null if one or both operands are null ; otherwise, the operator uses the contained values of its operands to calculate the result. For the bool? For more information, see the Nullable Boolean logical operators section of the Boolean logical operators article. The following example shows that 10 is. For the inequality operator!

If there exists a user-defined conversion between two value types, the same conversion can also be used between the corresponding nullable value types. An instance of a nullable value type T? You can unbox a boxed value of a value type T to the corresponding nullable value type T? The following example shows how to determine whether a System. What is the classic way to check if for example a parameter value is null? Since C version 7 you can use the is keyword for the null check like in the snippet below:.

Discards were also introduced. In combination with the Null-coalescing operator?? I think the is keyword is very clear and readable. It is my favorite.

You can read more about this in this blog post. With C 9. Before C 9. But the statements above are neither very readable nor easy to understand. But since C 9. So, with C 9. Thomas Claudius Huber. If there is a need to represent the possible abscence of a value I prefer the Option type. Unfortunately all NRTs bring to the table are compile-time checks that you are putting your null-guards in :.