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obj.Number = 3
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Console.Print Power4(obj.Number) => 81
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Prove that the property hasn t changed.
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Console.Print obj.Number => 3
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End Sub
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The preceding code contains a logic error because the Power4 function unnecessarily modifies an argument passed to it, but you aren t going to see this error if the Visual Basic 6 program never passes a variable (as opposed to a class field) to the Power4 function. The Number field isn t affected because Visual Basic 6 wraps a pair of hidden Property Get and Property Let procedures around the Number variable, and the Power4 functions can t alter the inner variable. Visual Basic .NET doesn t wrap hidden procedures around class fields; therefore, a lit eral translation of the preceding code makes the bug appear, as follows:
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A Visual Basic .NET code snippet that passes
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a Public variable defined in a class to the Power4 function
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Sub TestByRefPassing()
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Dim obj As New SampleClass
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obj.Number = 3
Console.WriteLine(Power4(obj.Number)) => 81
The Number property has changed as well.
Console.WriteLine(obj.Number) => 9
End Sub
Oddly, you can regard this behavior as a return to the past because Visual Basic 4 worked in the same way as Visual Basic .NET. The behavior of Public class fields changed in Visual Basic 5 and broke existing Visual Basic 4 code. You can expect to encounter a similar problem when you re porting Visual Basic 5 or 6 code to Visual Basic .NET. Incidentally, because there are no hidden wrappers, accessing a field is usually remarkably faster than accessing an equivalent property.
4:
Class Fundamentals
Visual Basic .NET doesn t support the ByVal keyword inside a statement that invokes a method:
This statement works in Visual Basic 6
but raises a compilation error in Visual Basic .NET.
Dim n As Integer: n = 3
res = Power4(ByVal n)
The only way to pass a number by value to a procedure that expects a ByRef argument is by enclosing the argument in parentheses:
obj.Number = 3
This statement passes the obj.Number property by value.
Console.WriteLine(Power4((obj.Number)) => 81
Prove that the Number property hasn t changed.
Console.WriteLine(obj.Number) => 3
In a difference from previous language versions, Visual Basic .NET classes can expose Public constants, which are seen outside the class as read-only properties:
Public Const DefaultPassword As String = mypwd
When using a numeric constant in an expression, you can explicitly define its type by appending one of the following characters to the value: I (Integer), L (Long), D (Dou ble), S (Short), or @ (Decimal):
Average = sum / 10D Divide by a Double.
The old type suffix characters %, &, !, and # are still supported.
Methods
You can implement class methods as Sub and Function procedures, exactly as you do under Visual Basic 6. You must account for the syntax changes already described in 3 for example, those affecting Optional arguments and argument passing:
Function CompleteName(Optional ByVal title As String = ) As String Use the title if provided. If title <> Then CompleteName = title & Append first and last name. CompleteName &= FirstName & & LastName End Function
Microsoft guidelines dictate that you use Pascal case for the names of methods (for example, ClearAll). Parameters should use camel case (for example, mainAddress) and never use a prefix that indicates their data type. Note that, unlike the Visual Basic 6 code editor, Visual Studio .NET can distinguish parameters from variables and doesn t automatically change the casing of a parameter to match the casing of a variable with the same name.
Part II:
Object-Oriented Programming
Another interesting suggestion from Microsoft is that you never define a parameter that has as its only purpose reserved for future use because newer versions of the class can overload a method (see next section) to support additional arguments without breaking backward compatibility with existing code.
Overloading
Visual Basic .NET lets you overload a method. Method overloading means that you can provide multiple methods with the same name but different parameter signatures that is, with a different number of parameters or with parameters of a different type. (A method s signature is defined as the list of its parameters and its return value; parame ters names don t affect the signature, but their types and whether they are passed via ByRef or ByVal do.) Before explaining how you implement overloaded methods, I think it makes sense to illustrate why overloading can be useful. Suppose you re creat ing a collectionlike class and include an Item method that provides access to the col lection s elements through either a numeric or a string argument. This is the code that you write under Visual Basic 6 to implement such a method:
Function Item(index As Variant) As String If VarType(index) = vbLong Or VarType(index) = vbInteger Then Access an element through its numeric index. ElseIf VarType(index) = vbString Then Access an element through its string key. Else Raise a run-time error otherwise. Err.Raise 999, , Invalid index type" End If End Function
The Visual Basic .NET solution is cleaner: you define multiple procedures with the same name and different syntax. You can explicitly state that you re overloading the Item method by prefixing it with the Overloads keyword:
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