Interface Properties

Question

In my interface, I declared a property with an installer and getter.

public interface ITestInterface
{
   string AProperty { get; set; }
}

When I code my class that inherits this interface, why do I need to define these two properties again?

public sealed class MyClass: ITestInterface
{
   public string AProperty { get; set; }
}

Answer 1

Since you are not inheriting from an interface, you are implementing an interface. (although both have the same syntax :)

public class MyClass : IMyInterface { ... } //interface implementing
public class MyClass : MyBaseClass { ... } //inheriting from a class

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Answer 2

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public sealed class MyClass: ITestInterface
{
    public string APROPERTY
    {
        get { return someField + " hello"; }
        set { someOtherField = value; }
    }
}

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Answer 3

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interface A { Foo(); } // basically an interface.
interface B : A { Foo(); } // another interface
class B : A { void Foo() {...} } // implementation of Foo, inherits A
class D : B,C { } // inherits both B, C (and A via both B and C).

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var tmp = new D();
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class B : A { void Foo() {...} } // changed into an implementation

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Foo() -> C::Foo() or B::Foo()???

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Answer 4

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Answer 5

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public interface ITestInterface
{
    string AProperty { get; set; }
}

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public sealed class MyClass: ITestInterface
{
    public string AProperty { get; set; }
}

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Answer 6

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public interface ITestInterface
{
    string AProperty { get; }
}

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class MyClass : ITestInterface
{
   public string AProperty { get { if (DateTime.Today.Day > 7) return "First week of month has past"; return "First week of month is on"; } }
}

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Answer 7

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public interface ITestInterface
{
   string GetAProperty();
}

public class MyClass : ITestInterface
{
    public string GetAProperty()
    {
        // Do work...
        return "Value";
    }
}