Tired of not having a generic version of IClonable?

[Brisingr Aerowing]

Try this extension method:

public static T Clone<T>(this T obj) where T : ICloneable
{
return (T)(((ICloneable)obj).Clone());
}

In VB:

<Extension()>
Public Shared Function Clone(Of T As IClonable)(ByVal obj As T) As T
Return DirectCast(DirectCast(obj, IClonable).Clone(), T)
End Function

(If the VB syntax is wrong, tell me. I don't use VB any more)

What do you get when you cross a joke with a rhetorical question? The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism. Do questions with multiple question marks annoy you???

[Garth J Lancaster]

neat !

[PIEBALDconsult]

No, but I found this in my code today:

public static T
Clone<T>
(
this T Connection
)
where T : System.Data.IDbConnection , new()
{
return ( new T()
{
ConnectionString = Connection.ConnectionString
} ) ;
}

I get the feeling that I never even tried to test it. I'm not sure I ever should. But it compiles! To make matters worse, I found that because I had just written this:

public static partial class LibExt
{
private static readonly System.Collections.Generic.Dictionary<System.Type,System.Reflection.ConstructorInfo> constructors ;

static LibExt
(
)
{
constructors = new System.Collections.Generic.Dictionary<System.Type,System.Reflection.ConstructorInfo>() ;

return ;

}

public static System.Data.IDbConnection
CloneConnection
(
this System.Data.IDbConnection Connection
)
{
System.Data.IDbConnection result ;

System.Type typ = Connection.GetType() ;

if ( !constructors.ContainsKey ( typ ) )
{
  constructors \[ typ \] = typ.GetConstructor ( System.Type.EmptyTypes ) ;
}

result = (System.Data.IDbConnection) constructors \[ typ \].Invoke ( new object \[ 0 \] ) ;

result.ConnectionString = Connection.ConnectionString ;

return ( result ) ;

}
}

Which I haven't tested either. :sigh:

[Dennis_E]

Note that this only works if T has an explicit implementation of ICloneable. Otherwise, Clone() will call the instance method and not the extension method. And you don't need the cast to ICloneable.

return (T)obj.Clone();

will do.