Parameters in C#: In C Sharp(C#) we can have three types of parameters in a function. The parameters can be In parameter (which is not returned back to the caller of the function), Out parameter and ref parameter (where by a reference to the variable is passed back).
Introduction
Parameters
in C#: In C Sharp(C#) we can have three types of parameters in a
function. The parameters can be In parameter (which is not returned
back to the caller of the function), Out parameter and ref parameter
(where by a reference to the variable is passed back).
The last
two type (out and ref) mentioned looks quite similar in nature. Both
parameters are used to return back some value to the caller of the
function. But still there is a small but important difference between
them. Both of the parameter type has been kept in the C# language for
specific scenario.
The main difference between the two types is in the rule for definite assignment of them.
When
we use the out parameter, The program calling the function need not
assign a value to the out parameter before making the call to the
function. The value of the out parameter has to be set by the function
before returning the value.
The same is not true for the
reference (ref) type parameter. For a ref type parameter, the value to
the parameter has to be assigned before calling the function. If we do
not assign the value before calling the function we will get a compiler
error.
Another important thing to note here is that in case of
ref parameter, the value passed by the caller function can be very well
used by the called function. The called function does not have the
compulsion to assign the value to a ref type parameter. But in case of
the out parameter, the called function has to assign a value.
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