Why fails to build this class?

Isidro Padilla

Hello everyone.

I have the following problem. I created the class attached below, but send me the following error:

Error: 'Tripolis.Compara' does not implement interface member
'System.Collections.Generic.IComparer.Compare(string, string)'
C:\Curso_5\Tripolis\Compara.cs 9 16Tripolis

Although I tried to find a solution in the network I have not managed to find it.

I hope someone on the forum can help me.
Thanks in advance.

ipadillar

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using System.Collections.Generic;

namespace Tripolis
{
public class Compara : IComparer
{
public int Method1(string _parametro1, string _parametro2)
{
return parametro1.Length.CompareTo(parametro2.Length);
}
}
}
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Translated into spanish:

Hola a todos.
Tengo el siguiente problema. He creado la clase que adjunto más abajo, pero me envía el siguiente error:

Error: 'Tripolis.Compara' does not implement interface member
'System.Collections.Generic.IComparer.Compare(string, string)'
C:\Curso_5\Tripolis\Compara.cs 9 16Tripolis

Aunque he intentado buscar un solución en la red no la he sabido encontrarla.

Espero que alguien en el foro me pueda ayudar.

Gracias por adelantado.
ipadillar

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using System.Collections.Generic;

namespace Tripolis
{
public class Compara : IComparer
{
public int Method1(string _parametro1, string _parametro2)
{
return parametro1.Length.CompareTo(parametro2.Length);
}
}
}
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4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes15y ago
Accepted answer
If you change the name of your method from 'Method1' to 'Compare' then it should work.

This is because the method name needs to be exactly the same as the interface method it's implementing.

Also 'parametr0' should be 'parametro2'.
Isidro Padilla15y ago
Thanks Vulpes, it now works.

Translated into Spanish:

Gracias Vulpes, ahora funciona.

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using System.Collections.Generic;

namespace Tripolis
{
public class Compara : IComparer
{
public int Compare(string _parametro1, string _parametro2)
{
return _parametro1.Length.CompareTo(_parametro2.Length);
}
}
}
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ipadillar
Vulpes15y ago
The name of the method should be 'Compare' not 'Compara'.
Isidro Padilla15y ago
Hi Vulpes,

I made the changes suggested by you but does not work either.

Error:'Compara': member names cannot be the same as their enclosing type
Translated into spanish:

Hola Vulpes,

He hecho los cambios que me has propuestos pero no funciona tampoco.

Error:'Compara': member names cannot be the same as their enclosing type

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using System.Collections.Generic;

namespace Tripolis
{
public class Compara : IComparer
{
public int Compara(string _parametro1, string _parametro2)
{
return _parametro1.Length.CompareTo(_parametro2.Length);
}
}
}
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Thank you
ipadillar