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classes and structures

Posted on 2011-05-04
Medium Priority
Last Modified: 2012-05-11
What is the difference between a structure and a class and when would you use on or the other.

An example of where you would use the structure rather then a class would be great
Question by:runnerjp2005
LVL 83

Expert Comment

ID: 35689316
A structure is usually used to hold Data where as a class can include the functionality.
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Expert Comment

ID: 35689321
A structure is usually used where multiple values need to be passed around, such as a return value of a function.
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Expert Comment

ID: 35689342
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Author Comment

ID: 35689368
so is one a reference to data and the other is data itself.

I also though structures and classes can both hold vunctions.

ones by ref and other is by val ?
LVL 16

Expert Comment

by:Imran Javed Zia
ID: 35689373
Th main points in class vs structure are:
Pass by Reference and Pass by Value

Please go throught the following links for more details:

LVL 12

Accepted Solution

Mohamed Abowarda earned 2000 total points
ID: 35690714
Structs differ from classes in several important ways:

- Structs are value types.
- All struct types implicitly inherit from the class System.ValueType.
- Assignment to a variable of a struct type creates a copy of the value being assigned.
- The default value of a struct is the value produced by setting all value type fields to their default value and all reference type fields to null.
- Boxing and unboxing operations are used to convert between a struct type and object.
- The meaning of this is different for structs.
- Instance field declarations for a struct are not permitted to include variable initializers.
- A struct is not permitted to declare a parameterless instance constructor.
- A struct is not permitted to declare a destructor.
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Assisted Solution

by:Mohamed Abowarda
Mohamed Abowarda earned 2000 total points
ID: 35690803
Structures are always better to declare a group of related variable, for example:
    Public Structure Person
        Public FirstName As String
        Public LastName As String
        Public Occupation As String
    End Structure

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While it's better to use classes when you have methods, events, properties, etc...
    Public Class ImageProcessor
        ' Variables
        Private image As Bitmap

        ' Events
        Public Event ProcessCompleted(ByVal e As EventArgs)
        Public Event ProcessError(ByVal e As EventArgs)

        ' Methods
        Public Sub ImageProcessor()

        End Sub

        Public Sub Start()

        End Sub
    End Class

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