C# Multiple inheritance using sealed class

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HI all

I have created a library of code that uses graph searching, and would like to display a label for each node in the graph.

The label control code was created by Microsoft, so it is a sealed unit. I would like the have it such that when a user clicks on the label, the node object associated with the label is updated.

Something like:

C#

class AStarGridSearchLabel: System.Windows.Forms.Label, AStarGridSearchItem
{
}

AStarGridSearchItem inherits from the AStarSearchElement.

The basic scheme I have is an A* search where I have AStarSearchElements and an AStarSearchAgent.
I then created a AStarSearchGrid that contains AStarGridSearchItem.
Now I want to display this on a form without having to rewrite lots of extraneous code.

AStarGridSearchItem is a concrete class and so is the System.Windows.Forms.Label.

Any ideas on how I can achieve this?

Thanks
MT

Posted 13-Aug-13 2:48am

mikkythomeon

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Comments

TrushnaK 13-Aug-13 9:32am

Sealed class can not be inherited.

Bernhard Hiller 13-Aug-13 9:34am

"Label" is not sealed.

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Maarten Kools · Accepted Answer · 2013-08-13T02:57:00

Multiple inheritance is not supported by C#

Why doesn't C# support multiple inheritance?[^]

What you could do is wrap the AStarGridSearchItem class in AStarGridSearchLabel and implement an interface, e.g.

C#

interface IStarGridSearchItem
{
    void Foo();
}

class AStarGridSearchItem
{
    public void Foo() { /* ... */ }
}

class AStarGridSearchLabel : Label, IStarGridSearchItem
{
    private AStarGridSearchItem _item = new AStarGridSearchItem() ;

    // Implement the interface, and wrap AStarGridSearchItem
    public void Foo()
    {
        _item.Foo();
    }
}