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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