局部类扩展多方法类

Question

Hi so i have one interface with 2 methods which is implemented by an abstract class and one partial class in 2 separate file which extends the abstract class

Ex:

public inteface Iterface
{
    void A();
    void B();
}

public abstract class Abstract : Interface
{
    public abstract A();
    public abstract B();
}


// Partial1.cs    
public partial class Partial : Abstract
{
    public override A(){}
}

// Partial2.cs
public partial class Partial : Abstract
{
    public override B(){}
}

I get the error that Partial does not implement Abstract correctly, how come? If i would add to Partial1.cs the B() so that i would have

// Partial1.cs
public partial class Partial : Abstract
{
     public override A(){}
     public override B(){}
}

all good, but why i am not allowed to implement the Abstract method in whatever file containing the Partial i want?

I've tried also with the following

// Partial1.cs    
public partial class Partial : Abstract
{
     public override A(){}
}

// Partial2.cs
public partial class Partial
{
    public override B(){}
}

Initially i wanted just to use the Interface but i had the same error "Partial class does not implement Interface correctly" so i though that maybe i cannot do so.

Is there any way of doing what i'm trying here? Implement the methods in whichever Partial class file i want ?

Thank you

Answer 1

Short Answer:

It depends on your compiler/IDE.
For example, it is possible in some versions of Visual Studio you may not be able to break up an interface across multiple partial classes.

---

You can do it.

In LINQPad and VS2017 this will compile just fine...

public interface I1
{
    void A();
    void B();
}

partial class Foo : I1
{
    public void A() {}
}

partial class Foo : I1
{
    public void B() {}
}

void Main()
{
    Foo foo = new Foo();
    foo.A();
    foo.B();
}

---

Consider using an alternative design

The alternative and viable use-case for partial classes would be to break down your class against different multiple interfaces. For example:

Interfaces

public inteface I1
{
    void A();
}

public inteface I2
{
    void B();
}

Breaking up a class 1-1 with Interfaces

public partial class Partial : I1
{
    public void A() { }
}

public partial class Partial : I2
{
    public void B() { } 
}

Which ultimately would compile to

public partial class Partial : I1, I2
{
    public void A() { }
    public void B() { } 
}

Answer 2

Found reason why it did not worked.

A partial class defined in assembly abc is not the same as defined in assembly ab

So i did not care to look about assembly info, in order for my partial class to have worked as i wanted i had to add them in the same assembly.

D'oh!

EX:

namespace A.BL.Repository.ARepo 

should be used wherever the partial class is present