Search results
Results From The WOW.Com Content Network
In VBScript, if a variant is assigned Nothing, this function still returns False. [15] IsError(expression) This function, in Visual Basic .NET, determines whether the expression passed as its argument is an exception object, i.e. an object of the System.Exception class or one of its subclasses. [7]
Using IIf, person.Name would be evaluated even if person is null (Nothing), causing an exception. With a true short-circuiting conditional operator, person.Name is not evaluated unless person is not null. Visual Basic Version 9 has added the operator If() in addition to the existing IIf() function that existed previously.
Visual Basic for Applications (VBA) [30] is a scripting language embedded in many Microsoft applications such as Microsoft Office, and third-party products like SolidWorks, AutoCAD, WordPerfect Office 2002, ArcGIS, Sage 300 ERP, and Business Objects Desktop Intelligence. There are small inconsistencies in the way VBA is implemented in different ...
In VB.NET, the Handles keyword is used to make the sub Button1_Click a handler for the Click event of the object Button1. In Visual Basic 6, event handler subs must have a specific name consisting of the object's name (Command1), an underscore (_), and the event's name (Click, hence Command1_Click).
Released in 1996, it is written in C++ and became an object oriented language. VBA 5.0 was launched in 1997 along with all of MS Office 97 products. The only exception for this was Outlook 97 which used VBScript. VBA 6.0 and VBA 6.1 were launched in 1999, notably with support for COM add-ins in Office 2000.
In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral (null) behavior.The null object design pattern, which describes the uses of such objects and their behavior (or lack thereof), was first published as "Void Value" [1] and later in the Pattern Languages of Program Design book series as "Null Object".
Since the Leszynski naming convention is a special form of Hungarian notation the same general advantages also apply to the Leszynski convention.. The use of distinctive prefixes makes your database self-documenting; when you see frmSales in VBA code, you will know that it references a form, and when you see curSales you will know that it is a Currency variable.
In VBA, an assignment of variables of type Object is a shallow copy, an assignment for all other types (numeric types, String, user defined types, arrays) is a deep copy. So the keyword Set for an assignment signals a shallow copy and the (optional) keyword Let signals a deep copy. There is no built-in method for deep copies of Objects in VBA.