C # parameter transfer mechanism

The parameter transfer mechanism of the C # method is different from that of the C and C ++ languages. An output transfer mechanism is added, and the other two mechanisms are value transfer and reference transfer.

Summary:

The parameter transfer mechanism of the C # method is as follows:

 

1. Value Transfer
2. Reference Transfer
3. Output Transmission

 

Based on the above description, we will give an example to illustrate the three transfer mechanisms.

Using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Text;

Namespace Method
{
Class Program
{
Public static void ValueMethod (int I) // pass the value
{
I ++;
}
Public static void RefereceMethod (ref int I) // pass the Parameter
{
I ++;
}
Public static void OutMethod (out int I) // pass the output
{
I = 0;
I ++;
}
Static void Main (string [] args)
{
Int I = 0;
ValueMethod (I );
Console. WriteLine ("I =" + I );
Int j = 0;
RefereceMethod (ref j); // you must add a ref parameter here.
Console. WriteLine ("j =" + j );
Int k = 0;
OutMethod (out k );
Console. WriteLine ("k =" + k );
}
}
}

 

When using these three transfer mechanisms, all the issues that need attention are given in the annotations. The output result of the program is:

I = 0

J = 1

K = 1

In C #, if the local variable of the Main function uses the value transfer method, the parameter remains the value before the call after it is called. Both output and reference parameters change the referenced variable values.

 

Let's talk about the transmission of variable length parameters (params) first look at the Code: