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For example, if I have a method defined as...
T Create()
{
T t = Factory.Create<T>();
// ...
Assert.IsNotNull(t, "Some message.");
// -or-
if (t == null) throw new Exception("...");
// -or- anything that verifies that it is not null
}
...and I am calling that method from somewhere else...
void SomewhereElse()
{
T t = Create();
// >><<
}
...at >><<, I know (meaning me, the person who wrote this) that t is guaranteed to not be null. Is there a way (an attribute, perhaps, that I have not found) to mark a method as ensuring that a reference type that it returns or otherwise passes out (perhaps an out parameter) is guaranteed by internal logic to not be null?
I have to sheepishly admit that ReSharper is mostly why I care as it highlights anything it thinks could cause either InvalidOperationException or NullReferenceException. I figure either it's reading something that I can mark on my methods or it just knows that Assert.IsNotNull, simple boolean checks or a few other things will remove the chance of something being null and that it can remove the highlight.
Any thoughts? Am I just falling victim to oh-my-god-resharper-highlights-it-I-have-to-fix-it disease?
603
Typically, you'll check for null using the triple equality operator ( === or !== ), also known as the strict equality operator, to be sure that the value in question is definitely not null: object !== null . That code checks that the variable object does not have the value null .
C# | IsNullOrEmpty() Method In C#, IsNullOrEmpty() is a string method. It is used to check whether the specified string is null or an Empty string. A string will be null if it has not been assigned a value. A string will be empty if it is assigned “” or String.
The null conditional is a form of a member access operator (the .). Here's a simplified explanation for the null conditional operator: The expression A?. B evaluates to B if the left operand (A) is non-null; otherwise, it evaluates to null.
If ReSharper is why you care then you can mark the Factory.Create<T>() method with their [NotNull] attribute described in their web help
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