C# Method Parameters

In the c#, Method is a block that contains a series of statements which only runs when it is called. We can pass different types of data, known as parameters, into a method.

Information can be passed to methods as parameter. Parameters act as variables inside the method

C# contains the given below Method Parameters:

• Named Parameters
• Ref Parameters
• Out Parameters
• Default or Optional Parameters
• Dynamic Parameters
• Value Parameters
• Params

Named Parameters

Using named parameters, we can specify the value of the parameter by parameter name regardless of its ordering in method. This concept is introduced in C# 4.0.

Single Paramerter

using System;
public class Program
{
  static void SingleParameter(string singleParam) 
   {
     Console.WriteLine(singleParam + " Is Information Technology");
   }
 public static void Main(string[] args)
 {
   SingleParameter("Find and solve");	
 }
}

Ouptput

Find and solve Is Information Technology

Default Parameter Value

using System;
public class Program
{
 static void SingleParameter(string singleParam="Find and solve") 
   {
     Console.WriteLine(singleParam + " Is Information Technology");
   }
 public static void Main(string[] args)
 {
   SingleParameter("Microsoft");
 }
}

Output

Microsoft Is Information Technology

Multiple Parameters

using System;
public class Program
{
  static void MultipleParameter(int a,int b) 
   {
      int sum =a+b;
     Console.WriteLine("The sum is {0}",sum);
   }

 public static void Main(string[] args)
 {
   MultipleParameter(10,12);	
 }
}

Output

The sum is 22

Return Type Parameter

using System;
public class Program
{
  static int ReturnTypeParameter(int a,int b) 
   {
     return a+b;
   }
 public static void Main(string[] args)
 {
  int sum=ReturnTypeParameter(10,12);
  Console.WriteLine("The Total Sum is {0}",sum);
 }
}

Output

The Total Sum is 22

Ref Parameters

The ref is a keyword in C# which is used for passing the value types by reference. You can say that type of parameters if any changes made in this argument in the method will reflect in that variable when the control return to the calling method. Does not pass property in ref parameter.

using System;
public class Program
{
  // Main Method
    public static void Main()
    {  
        // Assigning value
        string str = "Cat";
        // Pass as a reference parameter
        CompareValue(ref str);
        // Display the given value
        Console.WriteLine(str);
    }
    static void CompareValue(ref string val)
    {
        // Compare the value
        if (val == "Cat") 
        {
          Console.WriteLine("Matched!");
        }
        // Assigning new value
        val = "Dog";
    }
}

Output

Matched!

Dog

Out Parameters

An out param is similar to like as  ref param but any types of argument passed as out parameter need not to be initialized whereas in case of ref it must be initialized.It is generally used when a method returns multiple values and this type of parameter does not pass the property.

using System;
public class Program
{
   public static void OutParameterExample(out int number)
    {
        number = 14;
        number += number;
    }
  static public void Main()
    {
        int number;
        OutParameterExample(out number);
        // Display the value of num
        Console.WriteLine("The sum of"
          + " the value is: {0}",number);
    }
}

Output

The sum of the value is: 28

Default or Optional Parameters

This type of parameters optional parameters which is  not compulsory parameters. It helps to exclude arguments for some parameters. Or you can say in optional parameters, this is not compulsory to pass all the parameters in the method. This concept is introduced in C# 4.0.

using System;
public class Program
{
  static public void StudentDetails(string fName,int age,string block = "D block") 
    { 
        Console.WriteLine("First Name: {0}",fName); 
        Console.WriteLine("Age: {0}", age);       
        Console.WriteLine("Block: {0}",block); 
    } 
    // Main Method 
    static public void Main() 
    { 
        // Calling the detail method 
        StudentDetails("Rohani",25); 
        StudentDetails("Sylvia",18, "B block"); 
    } 
} 

Output

First Name: Rohani

Age: 25

Block: D block

First Name: Sylvia

Age: 18

Block: B block

Dynamic Parameters

Dynamic parameter introduced In C# 4.0.  Dynamic parameter means  that compiler does not check the type of the dynamic type variable at compile-time, instead of this, the compiler gets the type at the run time .

using System;
public class Program
{
  public static void DynamicParameterExample(dynamic param)
    {
        param *= param;
        Console.WriteLine(param);
    }
    // Main method
    static public void Main()
    {
        // Calling mulval method
        DynamicParameterExample(20);
    }
}

Output

400

Value Parameters

In the c#  value parameters is a normal value parameter in a method or we can say the passing of value types by value.

using System;
public class Program
{
  public static string ValueParameterExample(string str, string str1)
    {
      return str + str1;
    }
   static public void Main()
    {
        string str = "FindAndSolve";
        string str1 = "findandsolve";
        string result = ValueParameterExample(str, str1);
        Console.WriteLine(result);
    }
}

Output

FindAndSolvefindandsolve

Params

The ‘param’ keyword can be used to specify a method parameter that takes a variable number of arguments. When you use ‘param’ keyword to pass variable number of arguments we can send any number of arguments or no arguments. But all the arguments passed should be of same type.

using System;
public class Program
{
  public static int ParamExample(params int[] num)
    {
        int result = 1;  
        // foreach loop
        foreach(int i in num)
        {
            result *= i;
        }
        return result;
    }
   public static void Main(string[] args)
    {
        // Calling mulval method
        int res = ParamExample(14, 15, 20, 33, 48, 54);
        // show result
        Console.WriteLine(res);
    }
} 

Output

359251200