1 / 15

VB.NET Preview

VB.NET Preview. ILM Proprietary and Confidential - http://www.ilmservice.com. New in VB.NET. Complete object orientation Inheritance Method overloading Constructors and destructors Interfaces Delegates Shared members (Static members) Structured exception handling Multi-threading.

rafael
Télécharger la présentation

VB.NET Preview

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. VB.NET Preview ILM Proprietary and Confidential - http://www.ilmservice.com

  2. New in VB.NET • Complete object orientation • Inheritance • Method overloading • Constructors and destructors • Interfaces • Delegates • Shared members (Static members) • Structured exception handling • Multi-threading ILM Proprietary and Confidential - http://www.ilmservice.com

  3. Changes in VB.NET • Lower bound of an array is always 0 • Lower bound of an array can not be changed with OPTION BASE statement • OPTION BASE statement is not supported in VB.NET ILM Proprietary and Confidential - http://www.ilmservice.com

  4. Changes in VB.NET • Can not specify fixed size array which can not be resized with ReDim statement • VB 6.0 Syntax Dim Month(0 to 11) as Integer • VB.NET Syntax Dim Month(12) as Integer Dim Month() as Integer = new Integer(12) ILM Proprietary and Confidential - http://www.ilmservice.com

  5. Changes in VB.NET • In VB6.0, you can use ReDim statement to declare and initialize an array • In VB.NET, you have to declare an array with Dim, and re-initialize it with ReDim ILM Proprietary and Confidential - http://www.ilmservice.com

  6. Changes in VB.NET • In VB6.0, you can declare a String of a fixed size • Dim Name as String * 30 • In VB.NET, you can not declare fixed size String variables. ILM Proprietary and Confidential - http://www.ilmservice.com

  7. Changes in VB.NET • Changes in integer types as listed below • In VB6.0 • 16 bits = Integer • 32 bits = Long • 64 bits = {does not exist} • In VB.NET • 16 bits = Short • 32 bits = Integer • 64 bits = Long ILM Proprietary and Confidential - http://www.ilmservice.com

  8. Changes in VB.NET • In VB6.0 • Variant serves as universal data type • In VB.NET • Object serves as universal data type • Object provides all variant functionality • Variant does not exist in VB.NET • VarType function is not supported ILM Proprietary and Confidential - http://www.ilmservice.com

  9. Changes in VB.NET • In VB6.0 • And, Or, Xor, and Not are used for both Boolean and Bitwise operations • In VB.NET • And, Or, Xor, Not are strictly Boolean • BitAnd, BitOr, BitXor, BitNot are Bitwise operators ILM Proprietary and Confidential - http://www.ilmservice.com

  10. Changes in VB.NET • VB 6.0 • Default properties are supported on objects and controls • VB.NET • Default properties are not supported ILM Proprietary and Confidential - http://www.ilmservice.com

  11. Changes in VB.NET • In VB6.0 • Structure is declared with Type statement and all members are public • In VB.NET • Structure is declared with Structure statement, and all members must have access modifier • Type statement is not supported ILM Proprietary and Confidential - http://www.ilmservice.com

  12. Changes in VB.NET • In VB6.0 Dim I, J as Integer • I is variant, J is Integer • In VB.NET Dim I, J as Integer • I is Integer, J is Integer ILM Proprietary and Confidential - http://www.ilmservice.com

  13. Changes in VB.NET • In VB6.0 Set O = new Object • Sets O as Nothing, and it is not created until its first used • In VB.NET • Set statement does not exist • O = new Object will create instance right away ILM Proprietary and Confidential - http://www.ilmservice.com

  14. Changes in VB.NET • In VB6.0 • You can declare Optional parameter without default value • In VB.NET • Every Optional parameter must specify default value which would be passed if parameter is not passed ILM Proprietary and Confidential - http://www.ilmservice.com

  15. Changes in VB.NET • In VB6.0 • Parenthesis are required if calling function but not if calling Sub • In VB.NET • Parenthesis are always required ILM Proprietary and Confidential - http://www.ilmservice.com

More Related