c#--value parameter (1)

My C # is followed by brother (Liu Tieno) (my formal teacher), "The introduction of C # language," the study, on the elder brother also explained to me some do not know the place, for me is simply a huge wealth, a rare mentor!

This time with everyone. Learn about value parameters in C #

Value parameter (also called value parameter)

Value parameter (parameter)

What is a value parameter?

This is a section of the definition found in C # language Specification 5.0:

Used to pass input parameters. A value parameter is equivalent to a local variable, except that its initial value is derived from the argument passed for that parameter. Modifications to a value parameter do not affect the arguments that are passed for the formal parameter.

The value parameter can be optional, and the corresponding argument can be omitted by specifying a default value.

Pass-value parameter-value type

Note: 1. The value parameter creates a copy of the variable 2. Changes to the value parameter do not affect the value of the variable

Look at an example:

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 usingSystem.Threading.Tasks;6 7 namespaceBloguse8 {9     class ProgramTen     { One         Static voidMain (string[] args) A         { -Calculator C =NewCalculator (); -             inty =1024x768; the C.addone (y); - Console.WriteLine (y); -         } -     } +     -     //Prepare a calculator tool that can be calculated +     classCalculator A     { at          Public voidAddOne (intx) //The x here is the pass-value parameter  -         {   -x = x +1; - Console.WriteLine (x); -         } -     } in}

This is the result of the operation

Did you notice? We called the AddOne method on the variable y to add 1 to its stored value, but why is y still 1024?

This is because the parameter inside the method is a copy of the variable that is passed in, and what we are modifying in the method body is just a copy of Y passing in, which does not affect the value stored by the method outside the variable y

--------------------------------------------------------------------------------------------------------------- ------------------------

To be continued!

The next chapter to learn about the value of the pass parameter--reference type, create a new object

--------------------------------------------------------------------------------------------------------------- ------------------------

Hope that the majority of netizens point out the problem, point out where I understand the wrong, common exchanges and common progress!

c#--value parameter (1)