Only the original poster can know for sure if a time unit is neglible.

For more about using wildcard characters with the Find and Replace features in Excel, see Find or replace text and numbers on a worksheet. StackOverflow should auto-warn posts mentioning 'performance' and 'negligible' in the same sentence. Use wildcard characters as comparison criteria for text filters, and when you're searching and replacing content. So the answer is yes, there is a difference. Var watch = new () Ĭonsole.WriteLine($'? operator took ms') Var s = args.Length > 1 ? args : null // Compiler knows 's' can be null Operating on string, running on this particular machine, I got these average numbers: ? operator took: 583 msīenchmark sample code: static void Main(string args) I ran a simple test (multiple times) to get a feeling of which of the two is faster. Using ILDasm it becomes clear that the compiler does not treat those statements equally.Ĭonditional null check: IL_0026: brtrue.s IL_002fĪpparently, the ? operator implies a duplication of the stack value (should be the s variable right?). Make sure our null value is not optimized away by the compiler! Using Visual Studio 2017 15.9.8 targeting. (first.TotalMilliseconds / second.TotalMilliseconds).Dump('Ratio')

I used the following code and determined that the second method took about 1.75 times longer than the After the edit below, the ratio was 1.115 in favor of the 1st implementationĮven if they took the same time, I would personally use the language construct that is built in, as it expresses your intentions more clearly to any future compiler that may have more built-in I've edited the code to reflect the recommendations from the comments var A = new object() I just tried this in C# - very quickly, so there could be an error in my method. I would rather use if( null = A ) A = B instead of A = A ? B. using System Ĭonsole.WriteLine(second.TotalMilliseconds / first.TotalMilliseconds) īecause there is an extra assignment using ?, and the performance of the assignment sometimes might not guaranteed. Although performance for ? is negligible, the side effect sometimes may not be negligible.

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