Difference Between Inheriting And Creating Object Of A Class?
Jun 29, 2010When we can access the public methods via object then why is there need of inheritance.
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Inheriting A Class With Useful Methods Or A Creating A Module?
Nov 27, 2009What is neater / better in your opinion? Inheriting a Class with useful methods or a creating a module?
For example:
vb Module Tools_Module
Public Sub Print(ByRef text As String)
Console.WriteLine(text)
End Sub
End Module
[Code]...
Difference Between Timer Class And Object?
Nov 25, 2010I'm using vb10. I need to use a timer for forms to turn off and on and I was going to use a timer control and I noticed there is a timer class. What is the difference? Should I use the timer class instead?
View 5 RepliesVS 2008 - Find The Difference Between Creating A New Object In Program And New Record In The Database?
Mar 7, 2010I`m a beginning programmer, and I`m trying to build my first 100% object. The object would be a USER object, representing rekords from users table in database. The table in the database has 5 columns ->
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.net - Creating A New Instance Of A Class Object Box()
Sep 29, 2011my aim is to create a new instance box at the push of a button, the box has strings name and Id to be filled concatenating the auto generated ID i.e. 0 to 210 plus a string "Box" added by the user. I had problems earlier creating a structure within the class box, frankly I am not sure if the code below will work, as i try to run it in VB I get an error indicating that I am using the variables strBoxPositions() and strBoxNumbers() without assigning a value to it. The thing is the strBoxPositions() should automatically be filled by arrPosition() which will be created at the same time the new object box is created and the strNumbers() will be created with empty strings to be filled at latter stage by the used as and when necessary.
how could I initialise those arrays to get the program to run and perhaps ill be able to see if the code works or not, or just correct this code with a better way of code with comments, also if possible some indication on how could I update the strNumbers array inputing the strings one at a time on a text box field.
Public class form1
Public Class Box
Public intBoxID As Integer
[Code].....
Get Name Of Inheriting Class?
Apr 17, 2009In the below mockup, how do I find out, if I am an instance of FooDAL or WeeDAL from within the method DoMagix()?
Public MustInherit Class DataAccessClass
Public Sub DoMagix()
'** LOOK AT ME!!! **
[code].....
Creating A Custom Entity Class(object)?
May 13, 2011How would I create my custom Role class based on that autogenerated class? I have read a few articles on the net but I am still lost. Can someone please show me how to do this, and what I must import(using visual basic). I want to add some validation to the string property where Role1 cannot be more than 50 characters.
Autogenerated class
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.net - Inheriting From List(of T) Class
Apr 27, 2009I want to implement a priority queue class. When an item is added at a higher priority it is pushed to the front of the queue instead adding to the end of queue. Simple few lines of code
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Forms Inheriting From A Class?
Jul 3, 2010I've created a class called connector. By clicking on project and adding a class.And I want to inherit from that class in the forms But I get this error.
Base class '<baseclassname1>' specified for class '<partialclassname>' cannot be different from the base class '<baseclassname2>' of one of its other partial types`
what do I do?Here's the class named connect.vb:Imports MySql.Data.MySqlClient
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Superclass Access To Inheriting Class?
Dec 19, 2009I have 2 business classes, user & salutation and 2 DAL classes of the same name.
The business classes both have properties of the data class E.g.
Public Property Data() As Data.Salutation
Get
Return _Data
[Code].....
To access some data, you would do Business.Salutation.Data.SalutationID
Both busines classes inherit from BaseClass which contains all my database access methods.
Is there a way that I can access the Data property of the inheriting classes from the BaseClass?
I assume I will need to use reflection as the property types will always be different.
.net - Inheriting A VB Class In C# And Overriding Constructors That Take Optional Parameters?
Jan 12, 2010Most of our code base is in VB.NET. I'm developing a project in C# that uses a lot of the assemblies from the VB.NET code.There are three relevant classes in VB.NET:
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VS 2005 - Inheriting Class Based On Generic Interface
Nov 17, 2009I want to define a generic interface which will be implemented by an abstract Generic Class. Basically this generic class is a collection class of any class. Interfaces are in a separate project saved as FileReconciliation. Here are the interface definitions
Interfaces
Imports System.Collections
Public Interface ICollectionCommon(Of T As Class)
Inherits IEnumerable
Function Exists(ByVal oKey As Object) As Boolean
[Code] .....
Using Inheritance-Based Controls - Creating As New Classes (not UserControls) Inheriting From An Existing System Control
Oct 15, 2011I seem to be having a problem with controls that I am creating as new classes (not UserControls) inheriting from an existing system control. Everything seems ok while I create the control code, through to the compile (which is successful and adds the control to the toolbox) and dragging the control from the toolbox to the GUI surface. However, when I then debug or compile the project, I get a message such
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Inheriting Class Or Control - ListView, TreeView - Distinguish Between Built-in Methods/property/events
May 15, 2012When inheriting class or control e.g. ListView, TreeView, etc..., what is the best way to distinguish between built-in methods/property/events and mine?
Currently, i start my methods/property/events with "aa" in order to make them at the top of auto complete list.
.net - Class Inheriting From Another Class?
Aug 12, 2010I have a Class FileDoc Public Class FileDoc Inherits BaseClass
Public Sub DeleteDoc() dim catId as integer = Cat_ID
[Code]...
My question is, since FileDoc comes from the BaseClass, how can I access values from the BaseClass when I'm coding in the FileDoc Class. Like my example in sub DeleteDoc(), I'm trying to access the Cat_ID of the Base Class which this FileDoc belongs to.Adding an inheritance doesn't transfer the values to the class, only the properties.
Difference Between "=" And "As" When Creating Object Variable?
Jun 23, 2009I wonder, is there any difference between these two line of code in perfomance (suppose we have class called Car)?
Dim c = New Car
Dim c As New Car
Can't Make Difference Between Public Class And Private Class And Friend And Protected Friend Class
May 15, 2009I can't make difference between public class and private class and friend and protected friend class.
View 1 RepliesUtilizing A Centralized Class object That Needs To Call Another Class Object?
Jun 7, 2010I am utilizing a centralized class object that needs to call another class object. The program itself will do something like the following
sFieldValue = CentralObject.ObjectHandler(1, TestFunction, "FunctionVar,FunctionVar2,FunctionVar3")
In the central object I have a function
Public
Function ObjectHandler(ByVal ObjectType
As
Integer,
[code]....
Flattening An Object Hierarchy Using A Shim Class - Initializing Derived Object Properties From The Base Object?
Jul 10, 2010I am somewhat new to object oriented programming and am attempting to flatten a Linq object hierarchy by using a shim class.how to initalize a derived class with property values from a base class?I have two objects, a base object with about 100 properties, and a derived object which inherits from the base object and adds a few additional properties beyond those of the base object. My simple constructor creates the derived object, but I am looking for a way to initialize the derived object properties with values from the base object.Right now I am using reflection to iterate over the properties individually and I suspect there may be a better way. The following example shows my shim class constructor for the derived class, and two properties:
newProperty1 - a new string property of the derived class
flattenedProperty2 - a new string property of the derived class, copied from a 2nd-level object of the base class
Code example:
Public Class derivedObj
Inherits baseObj
Private _newProperty1 As String[code].......
Is this the correct constructor approach to flatten the object hierarchy using a shim class? My second question relates to initialization of properties in the derived class. The constructor above creates the derived object, but what is the best way to initialize the derived object properties with values from the base object? The following code uses reflection to iterate over the properties individually, but I suspect there may be a better way.
Code example:
' property names are in the string array fieldNames
'baseObjQuery is an ienumerable of baseObj
'derivedObjList is a list of derivedObj[code].....
Is there a simple way to initialize values for the properties in the derived object based upon the values of the common properties in the base object?
Difference In Creating Instance Between Vb & C#?
Sep 22, 2011I am converting C# to VB right now
in VB, I have these codes :
Dim ind As Foo.Index
Dim ed As Foo.Edit
ind = New Foo.Index
[Code]....
Seems I do need to show all the codes. But I need to talk directly to you as well (or You just install the software of mine).
Difference Between The Object ?
Apr 8, 2011If I create a class in VB called Test,I noticed I can instantiate it like:
Dim test As New Test
or
Dim test As New Test()
What is the difference?
Difference Between Array And Object
Jan 28, 2010I want to know the difference. I have given 2 lines code.
CODE:
Let me know difference between both datatype.
'Object Reference Not Set To Instance Of An Object' While Creating Pivot In Excel
Jun 23, 2012I'm trying to create a pivot table by opening an Excel file from my drive.But I'm receiving the error saying "Object reference not set to an instance of an object".[code]
View 1 RepliesError - Creating The Form - Object Reference Not Set To An Instance Of An Object
Apr 13, 2012I'm having this problem with my code and cannot seem to get past it although it was working fine before. The error is "An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object." The code is:
CODE:
I am trying to get information to be pulled out of a database and show in text boxes on another form (frmviewsdets). The error occurs when it gets to the line frmviewsdets.txtsnumber.Text = rdr("StudentNumber") and even when a breakpoint is applied there it just moves on to the next and so on.
I have tried to show frmviewsdets before I pull the data out of the database beut I get the same message.
Object Arrays - 2 Declarations - What's The Difference
May 23, 2010Dim MyOrders As Order()
Dim MyOrders2() As Order
Whats The Difference Between (As) And (=) In Object Declaration
Jun 2, 2011if I created a new object like this Dim sqlconn As New SqlClient.SqlConnection(cs)
and Dim sqlconn = New SqlClient.SqlConnection(cs) Whats the difference?
C# - Difference Between MustInherit And Abstract Class?
Mar 4, 2011explain to me the differences between an abstract class and a class marked MustInherit?
Both can implement shared and instance constructors and logic. Both can/must be inherited.
So why use one over the other and what is the difference?
Edit: Sincerely apologize I have got my languages mixed up. Will mark correct answer as soon as I am allowed.
Difference Between Private Sub / Function And Class
Oct 30, 2010What is the difference between Private Sub /private Function / Private Class and to use them?
View 4 RepliesDifference Between Using DataContext Class And SqlConnection?
Mar 2, 2012I asked a question earlier where I was told a simple way to "bind data to objects" is to just run a SqlConnection(connectionString). The response also included a comment saying I could get fancy with L2S and Entity Frameworks, so I looked deeper into those. It seems all you have to do with the DataContext object is point to the database. Why would SqlConnection be a benefit? What is the difference (or pros/cons) of using either one of these? Is one more "standard"? Is one more modern?
View 1 Replies.net - Difference Between Declaring And Constructing A Value Type Object?
Oct 2, 2009I've been working in .NET for some time now, but occasionally I still get confused by a disparity between the framework and my prior experience in C++.In .NET, all objects are either value types or reference types. Reference types are allocated on the heap while value types are allocated on the stack (in the current CLR implementation, anyway). I get that. However, at least in VB.NET, you can still define a constructor on a value type.
Public Structure Coordinates
Public x As Integer
Public y As Integer
[code]....
