class in a class?

Code:

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namespace ScratchDetection
{
    class ImageProcessing
    {
        public class hough
        {
        }
    }
}

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Can I have a class within a class?
If so how do I access the methods?

Quote:

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Can I have a class within a class?

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Oh yes. And a class in a class can access the 'parent' classes private members making it rather useful.

Quote:

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If so how do I access the methods?

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Like this :

Code:

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public class Outer
{
    private int _value;

    public Outer(int value)
    {
        _value = value;
    }

    public class Inner
    {
        public int GetOuterValue(Outer value)
        {
            // gain access to the parent classes private member variable
            return value._value;
        }       
    }
}

// example code
Outer.Inner inner = new Outer.Inner();
Outer outer = new Outer(100);
int outerValue = inner.GetOuterValue(outer);

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Get it ?

Darwen.

@zdavis - I don't see any nested classes in your example. Maybe a misplaced bracket?

@JustSomeGuy - What I'd suggest here is to just try it out. Nested classes in C# are very useful for limiting the scope of classes and avoiding unnecessary namespace clutter.

opedog....thank you for notice. I should pay a little more attention next time with my brackets.

@justsomeguy - sorry if I confused with my misleading example.

Thanks all.. Never a problem.

A question about instantiation...
If The outer class is instantiated by the user...
When does the inner class get instantiated?

Quote:

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Originally Posted by JustSomeGuy

When does the inner class get instantiated?

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If you call a constructor of it with the new keyword. Don't miss it with Java, there is a difference. Inner classes in C# is primary a matter of scope. They have access to private members of outer class and are accessible only via their outer class, so they share their accessibility.

Yup, nested classes are instantiated the exact same way as all the others. For instance:

Code:

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public class Class1
{
  public class NestedClass1
  {
  }
}

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You can instantiated NestedClass1 this way:

Code:

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Class1.NestedClass1 c = new Class1.NestedClass1()

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Or, if you're inside Class1, you can instantiate it this way:

Code:

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NestedClass1 c = new NestedClass1();

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