CSHARP

c# lambdas

//Lambdas are just short handed anonymous method or functions usally 
//for use in passing to other methods or functions to call such as a sort.
//Example:
//The Lambda used here after the =s
Action ExampleContainerForDelagate = ()=>
	{/*Do something such as this example*/
    	Console.WriteLine("Hello world");
	};
//has been shorted from this anonymous delegate or method.
Action ExampleContainerForDelagate = delegate () { Console.WriteLine("Hello world"); };
//And this full (named) method signature method passing
Action ExampleContainerForDelagate = ExampleMethod;
void ExampleMethod()
{ Console.WriteLine("Hello world"); }
//usage example
List<int> ExampleList = new List(){1,3,0};
ExampleList.Sort((x,y)=>{return x - y; });
//The Sort will sort based on the return values from the Lambda passed.
//a negative will be seen as a smaller than the next number
//a 0 will be seen as equal
//and a positive will be seen as bigger than the next number
//by switching x and y postion in the 'return x - y;' you will effectively 
//change the sort to descending order. This is there for useful for sorting 
//based on needs or where it is not obvious how to sort.

C# program lambda Func

using System;

class Program
{
    static void Main()
    {
        // Part 1: use implicitly-typed lambda expression.
        // ... Assign it to a Func instance.
        Func<int, int> func1 = x => x + 1;
        Console.WriteLine("FUNC1: {0}", func1.Invoke(200));
        
        // Part 2: use lambda expression with statement body.
        Func<int, int> func2 = x => { return x + 1; };
        Console.WriteLine("FUNC2: {0}", func2.Invoke(200));
        
        // Part 3: use formal parameters with expression body.
        Func<int, int> func3 = (int x) => x + 1;
        Console.WriteLine("FUNC3: {0}", func3.Invoke(200));
        
        // Part 4: use parameters with a statement body.
        Func<int, int> func4 = (int x) => { return x + 1; };
        Console.WriteLine("FUNC4: {0}", func4.Invoke(200));
    }
}