Question

What is Significance of using lambda expressions.

like in C# there foreach loop which might take 3-4 line for assigning values

using lamba

List.foreach(x=>x.something = new value) 

I would like to know more on lambda and more advance uses of it in C#

Answer 1

A lambda expression is more a less a short hand syntax for a method.

Take the following lambda expression:

p => p.FullName

This is equivalent to:

string getFullName(Person p)
{
    return p.FullName;
}

Its usage allows you to create anonymous functions. So a method that would take a delegate would be defined as:

public delegate string FullNameDelegate(Person p);
public void DoSomething(FullNameDelegate getter)
{
   Person p = new Person();
   string fullname = getter(p);
}
public string GetFullName(Person p)
{
    return p.FullName;
}

DoSomething(new FullNameDelegate(GetFullName));

The lambda equivalent would be:

public void DoSomething(Func<Person, string> getter)
{
   Person p = new Person();
   string fullname = getter(p);
}

DoSomething(p => p.FullName);