Lambda expression for multiple parameters

Question

I understand a lambda expression is in essence an inline delegate declaration to prevent the extra step

example

delegate int Square(int x)
public class Program
{
   static void Main(String[] args)
   {
      Square s = x=>x*x;
      int result = s(5);
      Console.WriteLine(result); // gives 25
   }
}

How does one apply Lambda expressions to multi parameters Something like

 delegate int Add(int a, int b)
 static void Main(String[] args)
 {
    // Lambda expression goes here
 }

How can multi parameters be expressed using Lambda expressions?

spajce · Accepted Answer · 2013-02-23 03:16:39Z

53

You must understand the Func behavior, where the last parameter is always the output or result

Func<1, 2, outPut>

Func<int, int, int> Add = (x, y) => x + y;

Func<int, int, int> diff = (x, y) => x - y;

Func<int, int, int> multi = (x, y) => x * y;

edited Feb 23, 2013 at 3:16

answered Feb 23, 2013 at 3:10

spajce

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2 Comments

Augustas Over a year ago

could someone elaborate, cant understand.

Prashanth Subramanian Over a year ago

@Augustas Func<int, int, bool> => (x,y) => x == y; // this will return the true or false in the third bool variable in the func. x and y are the first two ints in the func.

Romano Zumbé · Accepted Answer · 2017-07-03 13:05:25Z

15

Yes. When you have other-than-one (zero, or > 1) lambda arguments, use parenthesis around them.

Examples

Func<int, int, int> add = (a,b) => a + b;

int result = add(1, 3);

Func<int> constant = () => 42;

var life = constant();

edited Jul 3, 2017 at 13:05

Romano Zumbé

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answered Feb 23, 2013 at 3:09

Eric J.

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Comments

Aben · Accepted Answer · 2016-01-06 17:06:42Z

2

delegate int Multiplication(int x, int y)
public class Program
{
   static void Main(String[] args)
   {
      Multiplication s = (o,p)=>o*p;
      int result = s(5,2);
      Console.WriteLine(result); // gives 10
   }
}

answered Jan 6, 2016 at 17:06

Aben

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