How are parameters passed in C#?

Parameters are passed by value or reference in C#. This way, you can also pass parameters using out parameters and param arrays -

Value

This method copies the actual value of the parameter into the formal parameter of the function. In this case, changes made to the formal parameters inside the function have no effect on the actual parameters.

Reference

This method copies the reference to the memory location of the actual parameter into the formal parameter. This means that changes made to the parameters affect the parameters.

Out

The return statement can be used to return only a value from a function. However, using output parameters you can return two values ​​from the function. Output parameters are similar to reference parameters, except they pass data out of a method instead of into it.

Param

When declaring a method, you are not sure of the number of parameters passed as parameters. The C# param array gives you an idea of ​​this.

Here is a complete example to learn how to implement param in C# -

Example

using System;

namespace Program {
   class ParamArray {
      public int AddElements(params int[] arr) {
         int sum = 0;

         foreach (int i in arr) {
            sum += i;
         }
         return sum;
      }
   }

   class Demo {
      static void Main(string[] args) {
         ParamArray app = new ParamArray();
         int sum = app.AddElements(300, 250, 350, 600, 120);

         Console.WriteLine("The sum is: {0}", sum);
         Console.ReadKey();
      }
   }
}

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