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Today, I would like to share with you the relevant knowledge points about how to transfer parameters by reference in C#. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article, let's learn about it.

Pass parameters by reference

A reference parameter is a reference to the memory location of a variable. When parameters are passed by reference, unlike value parameters, it does not create a new storage location for those parameters. The reference parameter represents the same memory location as the actual parameter provided to the method.

In C #, use the ref keyword to declare reference parameters. The following example demonstrates this:

Using System

Namespace CalculatorApplication

{

Class NumberManipulator

{

Public void swap (ref int x, ref int y)

{

Int temp

Temp = x; / * Save the value of x * /

X = y; / * assign y to x * /

Y = temp; / * assign temp to y * /

}

Static void Main (string [] args)

{

NumberManipulator n = new NumberManipulator ()

/ * definition of local variables * /

Int a = 100

Int b = 200

Console.WriteLine ("value of a before swap: {0}", a)

Console.WriteLine ("value of b before swap: {0}", b)

/ * call the function to exchange values * /

N.swap (ref a, ref b)

Console.WriteLine ("value of an after exchange: {0}", a)

Console.WriteLine ("value of b after exchange: {0}", b)

Console.ReadLine ()

}

}

}

When the above code is compiled and executed, it produces the following results:

Before the exchange, the value of a: 100 before the exchange, the value of b: 200 after the exchange, the value of a: 200 after the exchange, the value of b: 100

The results show that the value in the swap function changes, and this change can be reflected in the Main function.

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