C # tips for the functional

Functional/generic refers to the mechanism by which a data type can be dynamically assigned at run time without specifying a specific parameter type at compile time. Believe that many people are not unfamiliar with generics, such as dictionary,list and other structures belong to the generic type. Interestingly, a function can also be generalized.

If we need a function that is responsible for a certain kind of logical operation (such as sorting, summing, counting, etc.) and not about what type of data is being manipulated, then in order for this function to become more generic, it can be written as a functional.

Give me a simple example that I have encountered:

You often write a file in a project, creating a dictionary of Key-value structures. Writing StreamReader and dicitonary sentences every time will make people feel that the yard is really a boring job. Then wrote a generic load Key-value Dictionary of the functional:

   classCommon {Internal StaticDICTIONARY&LT;T1, t2> loaddict<t1, t2> (stringFileCharSepBOOLHasheader =false,intkeyidx=0,intvalueidx=1) {Dictionary&LT;T1, t2> res =NewDICTIONARY&LT;T1, t2>(); using(StreamReader rd =NewStreamReader (file)) {                stringContent =""; if(hasheader) Rd.                ReadLine ();  while(Content = Rd. ReadLine ())! =NULL)                {                    string[] Words =content.                    Split (Sep); T1 Key= (T1) convert.changetype (Words[keyidx],typeof(T1)); T2 value= (T2) convert.changetype (Words[valueidx],typeof(T2)); if(!Res. ContainsKey (key)) Res.                ADD (key, value); }            }            returnRes; }    }

So just call common.loaddict<string,int> (filename, ...). This function is like a template that determines what type of data to use at run time.

typeof (T1));

If the type operation has more detailed requirements, then you can:

if (typeoftypeof(int))    { ... } Else if (typeoftypeof(double)) {...} Else   ...

C # tips for the functional