Method member declarations End (Web hosting macintosh) Structure Description Used to
Method member declarations End Structure Description Used to declare user-defined types. Structures are similar to classes, but they are value types rather than reference types. Rules at a Glance The members of a structure can be variables, properties, methods, or events. Note, however, that each member must be declared with an access modifier: Public (or Dim), Private, or Friend. You cannot assign a structure member an initial value at the same time as you declare it. As a result, the following Structure construct is illegal: Structure Point Public x As Integer = 0 ‘ Illegal Public y As Integer = 0 ‘ Illegal End Structure Structure members can be other structures or objects. If a structure member is an array, it cannot be explicitly dimensioned. Structures can be passed as arguments to functions or as the return type of a function. Although structures are similar to classes, the following class features are not supported in structures: o Structures cannot explicitly inherit, nor can they be inherited. o All constructors for a structure must be parameterized. o Structures cannot define destructors. o Member declarations cannot include initializers, nor can they use the AsNew syntax or specify an initial array size. Example The simplest and most common use of structures is to encapsulate related variables. For instance, we might define a structure as follows: Structure strPerson Public Name As String Public Address As String Public City As String Public State As String Public Zip As String Public Age As Short End Structure To define a variable of type strPerson, we write (as usual): Dim APerson As strPerson To access a member of a structure, we use the dot syntax, as in: APerson.Name = “Beethoven” Programming Tips and Gotchas
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