Method To Be Called In Child Class Constructor

Nov 11, 2009

How do I force the Visual Studio compiler to generate an error when a required method is not being called in the constructor of a child class? Like when you edit the form designer code, the compiler complains when InitializeComponent()isn't the first call in the constructor of a form. Is this even possible in VB.NET?

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Dispose Method - Why Class Destructor Not Being Called

Jun 22, 2011

I have a class that has a destructor and a Dispose method (I also inherit IDisposable). Why is it that the only time my destructor gets called is when I call GC.Collect()?

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Programatically Retrieve The Class That Called A Method?

Sep 11, 2010

I'm wondering if there's a way to programatically reference the class that called a method in another class. Let me give you an example:

Public Class OriginalClass
Private Sub Main()
Log.PgInit()

[Code]....

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Pass A Delegate Into A Constructor Of An Abstract Class From A Descendant's Constructor?

Feb 15, 2010

I have an abstract class which requires a delegate to function. I pass the delegate into the constructor. Now that I have a non default constructor I need to call the abstract class's constructors from the concrete class which means that I need to use MyBase.New(...). I have included a quick example below.

Public MustInherit Class BaseClass
Public Delegate Sub WorkMethod()
Private _Work As WorkMethod

[code]....

I have tried to do this but I keep getting the following error: "Implicit reference to object under construction is not valid when calling another constructor".Can I not do what I am trying to do above? I initially had the delegate setup in its own setter method. But then I am creating a deceptive API because it does require a point to a method to work properly.

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Inheritance - Create A Method Called StartWorking() And Want FrmChild To Inherit - Method

Nov 25, 2011

I have a large problem with inheritance in vb.net. The problem is the following:

I have 2 forms => frmBase and frmChild

In frmBase i want to create a method Called StartWorking() and i want frmChild to inherit this method.

But here is the tricky thing: when frmChild.StartWorking is called i would like the following => without calling MyBase.StartWorking()

I want frmBase.StartWorking() to be executed first and after a test in frmBase.StartWorking if blnValue is true then frmChild.StartWorking has to be activated. if blnValue is false that frmChild.StartWorking cannot be activated.

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Access To Object Passed ByRef In The Constructor Of A Class Through Another Part Of The Class?

Aug 18, 2009

I have some classes, BsfciFile and StudyFlashCard. Bsfci is the extension to which I save my set of flashcards in an INI format. I am currently working to transform my code from using Windows API calls to access the INI to using a IniFile class that I found on the internet. I would like the BsfciFile to have a Array of StudyFlashCard objects, but I would like the StudyFlashCard class to use the IniFile class object contained in the BsfciFile class. I can pass the IniFile from the BsfciFile class to the constructor for the StudyFlashCard class, but I want it to modify the same IniFile as the BsfciFile class has later on.

[Code]...

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Strongly-typed Generic Method Invokes Its Argument's Base Class Method Instead Of A Shadowed Method In T?

Oct 19, 2010

Consider a MyForm class that contains a shadowed implementation of Show(). It also contains a CreateForm() method, which accepts an instance of the form and calls the shadowed sub:

[Code]....

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Call A Method And Define It From The Constructor Of A Form?

Nov 12, 2010

I am suppose to call a method and define it from the constructor of a form.

MSDN says this in regards to something im doing.

Whatever, does it mean?

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Implement Class Constructor In VB?

Jul 19, 2010

I just would like to know how to implement class constructor in this language.

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Set Properties Of A Class Only Through Constructor

Mar 1, 2010

I am trying to make the properties of class which can only be set through the constructor of the same class

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.net - When The Property Get And Set Method Has Been Called

Mar 26, 2010

i have the following property declaration

[Code]...

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Add One Row When Method AddRow() Called?

Apr 4, 2011

i have problem when addnew row at keyup event for datagridview control. i want to add one row when method addRow() called.

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Javascript - Web Method Not Being Called

Dec 14, 2011

I'm working with a VB.Net page which calls a web method from JavaScript, this was working upto a week ago and now for some reason is not working.

Firstly my page generates a list of items that can be clicked, The line that does this is:

TicketHTML = TicketHTML + "<td><img src='../images/delete.png' Class='imgTicketClose' alt='Delete Task' onclick='DeleteTicket(" + row("id").ToString() + ")' /></td></tr>"

I know this is working as when the item is clicked I get a javascript popup so I would assume the problem is not here.

Now my Javascript:

function DeleteTicket(ticketID)
{
var answer = confirm("Do you really want to delete this task?")

[Code].....

EDIT: Could anything in the web.config file be preventing page methods from executing? I have just noticed this happening with a completely seperate web method and have checked the integers being passed into the javascript with an alert() and they are all valid

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Shadowed Method Is Not Called

Dec 30, 2010

I have a class which i realized will not always correctly instantiate and as a quick fix, i figured i'd subclass it and shadow a few methods so that the program can continue to run without exploding. When i run the software, calls to the methods resolve to the base's implementations and not the subclass. I'm using VB.NET with .NET 2.0. Here is an example of what i'm trying to do[code]....

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Construction - Inherit A Class That Also Has A Constructor

Mar 15, 2010

i'm working with different classes and different constructors. It's working fine until i try to inherit a class that also has a constructor. vb asks for mybase.new but when i add that vb says that a constructor cannot call itself, when i try it in a different way vb asks the parameters of the constructor of the class that i want to inherit.

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Declare New Bitmap In Class' Constructor?

Jun 6, 2009

i've declared a bitmap at class level + i want to load an image into that variable in the constructor. i don't know why but it won't work and everything i've tried won't work either.am i missing a reference or something?

[Code]...

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Overloaded Constructor In Abstract Class

Nov 19, 2010

I have an abstract class in vb.net with two subclasses. In the abstract class I have a constuctor that looks like this:[code]I would like to create a second constructor that doesn't take any arguments and just initializes the args to default values.[code]When I attempt to create a new subclass using the second constructor the compiler complains that I'm missing two args to the constructor.Is there a reason I can't overload the constructor in the abstract class?

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Use Constructor In A Custom Collections Class?

Mar 1, 2010

I have a custom collection class that I would like to pre-populate with data from the database. Basically it would search for "submembers" that are related to the "member" data record using the "member"'s primary key id.

I figured the best way to do this would be in the constructor of the class, but I am not so sure now. The collection class does not have any properties (the member class does).[code]...

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Breakpoint Not Hit When Method Called In Lambda

Aug 2, 2011

When I put a breakpoint in a method I'm calling from a lambda expression, the breakpoint is never hit. When I move the method call outside the lambda, the breakpoint hits.

For example:

Function IncrementAll(ByVal items As IEnumerable(Of Integer)) As IEnumerable(Of Integer)
Return items.Select(Function(i) Increment(i))
End Function

[Code]....

If I call IncrementAll, the breakpoint in Increment does not get hit. Is there a way to make VS 2008 stop on these breakpoints? I hate the thought of rewriting all my LINQ into loops just for debugging.

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Verify A Method Was Called Exactly Once Using AAA Syntax

Sep 26, 2010

I am trying to use the AAA syntax in Rhino Mocks with VB.Net to validate that a method was called only one time. I can't seem to get it right. With this code, if the repository is called twice, it returns nothing on the second call, and the test passes. I would have expected the test to fail when VerifyAllExpectations was called.

<TestMethod()>
Public Sub GetDataCallsRepositoryOneTime()
Dim repository As IDataRepository = MockRepository.GenerateMock(Of IDataRepository)()

[Code].....

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Wpf - DependencyProperty Callback-Method Not Called

Nov 29, 2009

I create a UserControl (TableWithFilter.xaml) with a dependency property (source). The UserControl is a Table with a source property for the different items. I created the XAML and set the source property via the XAML Binding. So far so good.

But if the value of the dependency property is changed, the defined callback method is not called. Therefore I cannot update the entries in my table. Has anyone an idea why the callback method is not called?

Here is the definition of my property in the class "TableWithFilter":

Public Shared ReadOnly SourceProperty As DependencyProperty = _
DependencyProperty.Register("Source", GetType(List(Of TableViewItem)), GetType(TableWithFilter), _

[Code]....

If the attribute "ContentList" is changed I expet that the "ChangeSource" method in the TableWithFilder class is called. But this is not the case. After I changed the ContentList attribute, I Raise the following Event:

RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("ContentList"))

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Custom Class Constructor Needs To Be Able To Return Error

Mar 12, 2010

I'm making a class that reads a file and processes data in it, but I need some error handling. I'm giving it a constructor that takes a file location and processes that file. How can I make it so the constructor tells the program whether it found the file or not? Optimistically the program that calls this class would check for that first, but since I'm not going to be the only one that uses this class I'd like to know how to secure such a thing. It's probably bad practice to do this within the class, but I'd like to be sure it's as portable as possible.

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Event Raised In Constructor Cannot Be Handled Outside Very Class

Oct 26, 2009

I discovered that an event raised (directly on indirectly) in the constructor cannot be handled outside the very class. To prove if that was the actual problem, I wrote a simple exemplary app.
Class with the event:
Namespace Utils
Public Class A
Public Event Test()
Public Sub New()
CallTest()
[Code] .....
The reason of such behavior became quite obvious after writing those pieces, but maybe there is a way to omit it?

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Naming Convention For Variables In Class Constructor

Nov 26, 2010

In the past when I have written classes and constructors, I named the variables in the constructor parameter something different than what would have been stored in the actual class itself.What I do now is name them the same, and reference the internal variables with Me.varname.Here is a class I just started building.Is my naming convention incorrect? [code]

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Partial Mock Of A Class With Private Constructor

Sep 9, 2011

I am trying to write some unit tests on a class that looks like this, using Moq [code] the parameterized constructor is private or internal one of the two methods relies on the result of the other.I want to check that when GetThisOrThat is called with a value, it actually calls GetThis. But I also want to mock GetThis so that it returns a specific well-known value.To me this is an example of Partial Mocking, where we create a Mock based on a class, passing the parameters for the constructor. The problem here is that there is no public constructor, and therefore, Moq can not call it..I tried using the Accessors generated by Visual Studio for MSTest, and use those accessors for the mocking, and this is what I came up with [code]

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Set ReadOnly Field In Constructor Of Inherited Class

Apr 1, 2012

[Code]...

Is there an explanation for this limitation? I mean, it's still in the constructor for the object, and the base class constructor is still executed first.

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VS 2008 - Creating Default Constructor Within Class

Feb 3, 2010

I'm doing a lab for school, and I came across something I have never done before: create a default constructor within my class. It involves creating a private field to store the connection string, then create a default constructor that sets the connection string.

Here is what I have so far:
Public Class Appointments
Private sqlconnection As String = ConfigurationSettings.AppSettings("ConnectionString")
Private Property connectionstring() As String
Get
Return sqlconnection
[Code] .....

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VS 2010 Dll That Is Implemented By A Class With A Default Constructor

Dec 27, 2010

I have a base class which must be overriden. This base class sits in one dll shared by all. The derived classes will each be in their own dll such that the addition of a new derived class can be done by distributing a new dll. The set of dlls, and therefore the set of derived classes, will be discovered by the main program on startup. That's all pretty straightforward. The problem is that the main program needs to be able to query a database to figure out which type of derived class it needs, then create a class of that type. Naturally, it can't know which types will be available ahead of time because even I don't know that. The program has to be dynamically extensible.The obvious way to do this is to have an interface in the dll that is implemented by a class with a default constructor. The sole purpose of that class would be to return an object of the type (one of the derived types) defined in that dll. The derived types can't really be this class, because they can't have a default constructor since the base class doesn't have a default constructor, and the derived class can't make up the arguments that the base class constructor needs.

So basically, each dll that houses a derived class would also house a simple class that implemented an interface for the sole purpose of creating that particular derived class. The main program would examine the dll to find a class that implemented the interface, and once it found one, it could ask it what type of class it created, or it could ask it to create an instance of that class. It seems like there ought to be an easier way to dynamically add new classes to the project. It seems like the derived class ought to be able to tell the main project what type it was. This could be done, except that the derived class would have to exist before any of its methods could be called unless the methods were shared. Since you can't have a shared method in an interface, the interface itself would make no sense at that point, in which case I would need to discover whether the class in the dll derived from the base class in the second dll, just to figure out whether or not I wanted to create it. That's getting convoluted by now, so I guess I'll leave it there. The basic point is that the base class is known to the main program from a common dll. The number and types of derived classes can't be known at this time, so the program has to be able to discover them dynamically. Each derived class will sit in its own dll (or there could be more than one in a dll), and has to be discovered, and instances created, as needed, by the main program.

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VS 2010 Pass By Reference To Constructor Of A Class?

Feb 11, 2012

Implementing a simple MVC in vb. The controller instance creates and holds instances of the model and view:

Public Class Controller
Public Property myModel As Model
Public Property myView As View

[code].....

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Constructor - Whats The Best Way To Initialize Shared Members In A Class In VB.Net?

Dec 8, 2010

I was looking on the interweb to see if there were any good examples on how to initialize shared members within a class while still initializing instance variables. I did find an expression that might fit to the answer:

[code]...

How do I initialize both instance and shared members without re-initializing the shared members every time an object is created from a class? Thanks!

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