C# parameters in interface

Question

class Test {
    public Test(string name, string age) {
    }
}

interface ITest
        ????????

class Example: ITest {
    public Example(/* ... */) {
    }
}

So what should I use in my interface to use the same parameters in my example as in test?

What I want to do:

I have 3 classes: a, b and c.
I want my c to inherit from both a and b.

But C# doesn't let you do that ... So I want to use an interface.

EDIT My classes are:

Student(name, age, studies)
Teacher(name, age, classes)
Working Student/Teacher(name, age, studied/classes, payment)

So i want to use methods in my working class from the other classes.

Your question is *very* unclear. – Ken Kin Apr 18 '13 at 16:39 — Ken Kin, Apr 18 '13 at 16:39

Kyle C · Accepted Answer · 2013-04-18T16:13:06.013

1

Interfaces are used as a contract for classes that inherit it. This means any public methods/properties you want the interface to expose, must also be exposed in the inherited class.

In the case above, you don't have any public methods/properties exposed in the interface. Let me show you an example.

Interface ITest
{
   void AddPerson(string name, string age);
}

Interface IPerson
{
    string ReturnPersonsAge(string name);
}

/// This must expose the AddPerson method
/// This must also expose the ReturnPersonByAge method
class Example : ITest, IPerson
{
   Dictionary<string, string> people = new Dictionary<string, string>();

   void AddPerson(string name, string age)
   {
      people.Add(name, age);
   }

   string ReturnPersonsAge(string name)
   {
      return people[name];
   }
}

I hope that helps, but feel free to ask more questions so I can help narrow down your question.

edited Apr 18 '13 at 16:13

answered Apr 18 '13 at 16:03

Kyle C

1,627
12
25

hey, What i want to do: I have 3 classes -> a, b and c I want my C to inherit from both a and b. But c# doesn't let you do that... So i want to use a interface. – user1765216 Apr 18 '13 at 16:07
i thought you can't inherence from more then 1 class ?? – user1765216 Apr 18 '13 at 16:09
Sorry Multiple Inheritence is not allowed, but you are allowed to inherit from multiple INTERFACES, which is slightly different. See edit. – Kyle C Apr 18 '13 at 16:14
Yea i knew that i had to use interfaces =D Ty for your answer nonetheless – user1765216 Apr 18 '13 at 16:22

score 0 · Answer 2 · answered Apr 18 '13 at 16:02

0

Interfaces can't define constructors. There certainly is other way to do it, depends on what you want to achive.

answered Apr 18 '13 at 16:02

Zbigniew

27,184
6
59
66

score 0 · Answer 3 · answered Apr 18 '13 at 16:14

Interface IAClass
{
  void Add(string s);
}
Interface IBClass
{
  void Delete(string m);
}


Class A: IAClass
{
  void Add(string name)
{
  // Your Logic
}
}

Class B: IBClass
{
  void Delete(string name)
{
  // Your Logic
}
}

Class C:IAClass,IBClass
{
     void Add(string name)
{
  // Your Logic
}

 void Delete(string name)
{
  // Your Logic
}
}

score -1 · Answer 4 · answered Apr 18 '13 at 16:00

-1

You can expose them as properties in the interface

Interface ITest
{
string Name{get;set;}
string Age{get;set;}
}

answered Apr 18 '13 at 16:00

AD.Net

13,352
2
28
47

And if i use Public Test(params string[] parameters) – user1765216 Apr 18 '13 at 16:01

C# parameters in interface

4 Answers4