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CLR v2.0 Array.ForEach and List.ForEach

  • Article

Consider an array of strings:
string[] strs={"uno", "dos", "tres"};

Consider a method like:
static void shows(string s){  Console.WriteLine(s);}

Invoking that method for each string in the array, one way:
foreach(string s in strs)  shows(s);

There is need to invoke different methods other than 'shows' for the entire array, then consider:
delegate void process_string(string s);void process_array(string[] strs, process_string amethod){  foreach(string s in strs)    amethod(s);}

Used this way:
string[] strs={"uno", "dos", "tres"};process_array(strs,new process_string(shows));

The above is good CLR v1.1 code, with CLR v2.0 consider:
string[] strs={"uno", "dos", "tres"};Array.ForEach<string>(strs,new Action<string>(shows));

Ok with arrays, but also with generic List collection:
System.Collections.Generic.List<string> strs=new System.Collections.Generic.List<string>();strs.Add("one");strs.Add("two");strs.Add("three");strs.ForEach(new Action<string>(shows));

If shows is not invoked from any other place, consider:
strs.ForEach(new Action<string>(delegate(string s) { w.WriteLine(s); }));

One method (process_array) or two (shows) and one delegate (process_string) saved.