Question

In my ‘Person’ class, I have some fields like ‘firstname’,’lastname’,’nickname’ and so on.

I want to write code to search dynamically, sometimes by ‘firstname’ and sometimes by ‘nickname’ field.

In the regular way, the code will be:

If(SearchBy == "firstname") 
{
     Person result = ListOfPerson.Where(p => p.firstname== "exp").FirstOrDefault();
}
else If(SearchBy == "nickname") 
{
      Person result = ListOfPerson.Where(p => p.nickname== "exp").FirstOrDefault();
}

But the code I want to write, should be like this:(to save the if each time)

Object someVariable  = "firstname";

Person result = ListOfPerson.Where(p => p.someVariable == "exp").FirstOrDefault();

Can anyone Know if it’s possible?

Answer 1

How about something like this:

Func<Person, bool> searchDelegate;

switch (searchMode){
    case "firstname":
        searchDelegate = (p => p.firstname == searchValue);
        break;
    case "lastname":
        searchDelegate = (p => p.lastname == searchValue);
        break;
    case "nickname":
        searchDelegate = (p => p.nickname == searchValue);
        break;
    default:
        throw new Exception("searchMode is invalid");
}

return ListOFPerson.Where(seachDelegate).FirstOrDefault();