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What are the benefits of inheriting from multiple classes?

I saw some comments on the forums, and it seems that people want to inherit from several classes in C #. Why do you need this? I cannot think of any good for this, but since there are people who want this, there must be some.

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Well, here is an example of ASP.NET WebForms:

I have one base class, a web control, let's say it's simple TextBox.

I then inherit from TextBoxto provide formatting RichTextBox.

Then I want to have TextBoxone that can spell check SpellCheckingTextBox.

, SpellCheckingRichTextBox? .

: ISpellCheckingTextBox IRichTextBox SpellCheckingRichTextBox. TextBox, .

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One legitimate case for wanting it in C # is to create a derived MarshalByRef object. For example, let's say I want to do the following:

public class FooCorpClass
{
  // This class is defined in a 3rd party library and thus can't be changed
}

public class MyFoo : FooCorpClass, MarshalByRef
{
  // I can't do this because MarshalByRef isnt' an interface
}

Personally, I see that it is a shame that you cannot have multiple inheritance if there are no collisions, or there are collision processing mechanisms, but they are interruptions.

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