Passing a function as parameter [duplicate]

Question

I need a way to define a method in c# like this:

public String myMethod(Function f1,Function f2) {     //code } 

Let f1 is:

public String f1(String s1, String s2) {     //code } 

is there any way to do this?

Answer 1

Sure you can use the Func<T1, T2, TResult> delegate:

public String myMethod(     Func<string, string, string> f1,     Func<string, string, string> f2) {     //code } 

This delegate defines a function which takes two string parameters and return a string. It has numerous cousins to define functions which take different numbers of parameters. To call myMethod with another method, you can simply pass in the name of the method, for example:

public String doSomething(String s1, String s2) { ... } public String doSomethingElse(String s1, String s2) { ... }  public String myMethod(     Func<string, string, string> f1,     Func<string, string, string> f2) {     //code     string result1 = f1("foo", "bar");     string result2 = f2("bar", "baz");     //code } ...  myMethod(doSomething, doSomethingElse); 

Of course, if the parameter and return types of f2 aren't exactly the same, you may need to adjust the method signature accordingly.