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This article introduces the relevant knowledge of "Analysis of different points of C# parameters". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Ref is the address where the parameter is passed, and out is the return value. There are some similarities between the two, but there are also differences in C# parameters. Variables must be assigned values before using ref, not out. The function of out will empty the variable, even if the variable has been assigned. When you exit the function, all variables referenced by out must be assigned, and those referenced by ref can be modified or not.

For the differences in C# parameters, see the following code:

Using System

Class TestApp

{

Static void outTest (out int x, out int y)

{/ / before leaving this function, you must assign values to x and y, otherwise an error will be reported.

/ / y = x

/ / the above line will report an error, because x and y are cleared after using out

It needs to be reassigned, even if it has been assigned before calling the function.

X = 1

Y = 2

}

Static void refTest (ref int x, ref int y)

{

X = 1

Y = x

}

Public static void Main ()

{

/ / out test

Int a,b

/ / variables can not be assigned before out is used.

OutTest (out a, out b)

Console.WriteLine ("a = {0}; b = {1}", aPerry b)

Int canals 11 and dudes 22

OutTest (out c, out d)

Console.WriteLine ("c = {0}; d = {1}", cPerry d)

/ / ref test

Int m,n

/ / refTest (ref m, ref n)

/ / the above line will make an error. Variables must be assigned before ref is used.

Int oysters 11 and 22

RefTest (ref o, ref p)

Console.WriteLine ("o = {0}; p = {1}", o < p)

}

}

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