[Solved] How can I use lambdas with methods in C#?

Question

you can use an expression bodied method.

static double Stirling(long n) => Math.Sqrt((2 * n + 1.0 / 3.0) * Math.PI) * Math.Pow(n, n) / Math.Exp(n);

This is only possible when the method executes a single statement, and in this case, we get rid of the return statement.

or you can use a Func delegate to represent a behaviour as such:

Func<long, double> func = (long n) => Math.Sqrt((2 * n + 1.0 / 3.0) * Math.PI) * Math.Pow(n, n) / Math.Exp(n);

and then call it like so:

double result = func(2);

it’s important to note that the => operator is used for both expression bodied methods (first example above) and lambdas (second example above) but they’re completely different beasts.

Accepted Answer

you can use an expression bodied method.

static double Stirling(long n) => Math.Sqrt((2 * n + 1.0 / 3.0) * Math.PI) * Math.Pow(n, n) / Math.Exp(n);

This is only possible when the method executes a single statement, and in this case, we get rid of the return statement.

or you can use a Func delegate to represent a behaviour as such:

Func<long, double> func = (long n) => Math.Sqrt((2 * n + 1.0 / 3.0) * Math.PI) * Math.Pow(n, n) / Math.Exp(n);

and then call it like so:

double result = func(2);

it’s important to note that the => operator is used for both expression bodied methods (first example above) and lambdas (second example above) but they’re completely different beasts.