Out vs. Ref Parameters in C#: When Should You Use Which?
Published on 2025-01-28
Browse:862
When choosing between "Out" and "Ref" parameters, unless "Ref" is specially required, the preset selection is "OUT". The difference between
out and Ref
"Ref" allows method modification to modify the original value of the variable transmitted as a parameter, while "OUT" is prohibited from this ability. When data transmission involves data transmission of cross -process or cross -machine, this difference becomes vital, because the initial value of the marshal may lead to unnecessary processing.
Consider the following scene:
person.getbothnames (out a, out b); Assume that "Person" is an object. "Getbothnames" is a method for retrieved two values. The initial value of "A" and "B" has nothing to do with the operation of the method. In this case, using "IN" or "OUT" is a preferences, and "OUT" is a recommended option to eliminate useless marshals that are used in initial values.
person.GetBothNames(out a, out b);In short, in most cases, if the initial variable value is not required, "OUT" is a better choice; when such modifications need to be performed, "Ref" becomes necessary.
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