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Performance difference between ?? and IsNull?

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Anil
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Anil asked on 08 Nov 2018, 05:06 PM
Since the null-coalescing operator (??) and the IsNull function appear to do the same thing, I was wondering if there is a performance benefit of using one over the other.

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Ivan Hristov
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answered on 13 Nov 2018, 10:31 AM
Hello Anil,

The null-coalescing operator ?? should perform a bit faster than the IsNull function, because the functions are resolved via method attributes, which involves reflection, while the ?? operator instantiates a new binary function and passes the operands to it. However, I expect the execution time for both to affect the performance by a very small factor, because the resource-consuming tasks are mainly performed during the process of building the processing tree and rendering the document, so it's much to your preference to use one or another.

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Ivan Hristov
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