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// The various formats of the Func<> delegate.

public delegate TResult Func(

T0 arg0, T1 arg1, T2 arg2, T3 arg3)

public delegate TResult Func(T0 arg0, T1 arg1, T2 arg2)

public delegate TResult Func(T0 arg0, T1 arg1)

public delegate TResult Func(T0 arg0)

public delegate TResult Func()

Given that many members of System.Linq.Enumerable demand a delegate as input, when

invoking them, we can either manually create a new delegate type and author the necessary target

methods, make use of a C# anonymous method, or define a proper lambda expression. Regardless

of which approach you take, the end result is identical.

While it is true that making use of C# LINQ query operators is far and away the simplest way to

build a LINQ query expression, let’s walk through each of these possible approaches just so you can

see the connection between the C# query operators and the underlying Enumerable type.