Restrict type with Generics Constraints

Question

Hi everyone,

I want to build a example about Generics Constraint with the question:
How will the complier catch a error when user input string type but reasonable with int, float, double, long type?
Can you help me this problem?

Many thanks.

Cuong Pham · Answer

Thanks everyone very much....I solved this problem with IFormattable Best wishes for u !

Vulpes · Answer

Just use the 'struct' generic constraint which will prevent string (a class) from being used at compile time but will permit int, float, double and long which are all structs.

Iftikar Hussain · Answer

please refer the below link to compare string http://www.c-sharpcorner.com/uploadfile/yougerthen/using-icomparable-and-icomparer-to-compare-objects/ Regards, Iftikar

Iftikar Hussain · Answer

can you share the compare class?

Cuong Pham · Answer

Thanks ur attention It means that you can initialize a object with string type, the compile time will catch error. ex: Create a class Compare two number and method int Compare(T a, Tb); and then in Main method: ObjectClass t = new ObjectClass (); ----> ok ObjectClass t = new ObjectClass (); ----> ok ObjectClass t = new ObjectClass (); ----> ok ObjectClass t = new ObjectClass (); ----> ok but: ObjectClass t = new ObjectClass (); ---> error It only supports int, float, long, double.

Iftikar Hussain · Answer

Hi, I am not clear about your query. Can you please explain bit more? Regards, Iftikar

Restrict type with Generics Constraints

Answers (6)