Suppose I want to inherit from System.Data.SqlClient.SqlTransaction which is sealed. Supose I want to just put a wrapper around SqlTransaction and always use MyTransaction instead of SqlTransaction. Is there a way I could potentially cast MyTransaction to SqlTransaction using an Implicit/Widening operator?
View 8 RepliesAnyone ever get fake compile errors and rebuild the program and then they go away? Well mine aren't going away and I can compile and run no problem. I've got something like 100 compile errors and the "run with error's" warning doesn't appear at any time and when I do run my program it runs just the way it should. However I still see like 100 errors.
View 4 RepliesI need to make a program for a fake/hypothetical company.The "company's" pricing is based on the number of days of the rental as detailed below; note that all time beyond a half day is counted at the full day or weekly rate. In addition, they offer insurance for their vehicles at a daily rate; insurance is mandatory for half-day rentals, and is only available at the full-day rate. The charge rates are as follows:
Half Day $20.00
Full Day $35.00
Weekly (7 days or more) $32.00 / day
Insurance $5.00 / day
And 8% sales tax has to be added on.
Does anyone know of a way to script falsifying the amount of RAM installed on a PC for an install. I have a program that needs to be installed on many systems that all have little RAM. The program requires during the setup that at least 384 MB of RAM be installed. Some of these systems only have 256 so the install fails. I know the easy answer is install more RAM. Ain't going to happen. Company has no budget. The install should be fine I think, but would like to test more. in order to do the testing to see if this would even work though I need to figure out how to have the OS tell the app it has more RAM than it does. I don't know this app but my first guess is the app queries WMI for amount of RAM?? If that's the case is there a way to set that WMI entry to something different until after the app is done? Or if someone knows another way that would be good too?
View 17 RepliesI have two tables, Clients and Administrators, which are linked in a many-to-many relationship by the table ClientAdministrators. In the real application this works fine and I can get a list of Administrators for my Client. My problem comes in trying to unit test the service class that is retrieving this from the repository. I have a FakeRepository class which implements my repository interface and I have several internal lists of objects for the service class to query against.
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I have this code to send an email:
Imports System.Net.Mail
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code].....
how do you make a fake error popup window?
View 1 RepliesI want make a antivirus a real that can find everything iwant a tutorial that haves pictures how to do it
View 2 Repliesi want to make fake progress bar when i click on the button:
for i = 0 to Maximum
progressbar1.value = progressbar1.value + 1
next
but the progressbar.value = 100 Too fast
I know you can use regex to verify an email address format, but is there a way to, outside of sending an email to the address to verify that an email address is actually a working email address?
View 4 RepliesI'm trying to create a fake virus for a collegue who keeps changing our desktop backgrounds. I have created a form in vb 2008. It as a window security icon and coule text boxs saying virus has been found, it has 3 buttons (Repair), (Quarantine) & (Ignore) and a progress bar on the form. I have put a timer event on the form too. My question is: How can i get the progress bar to pause at 50% and say files cannot be repaired, once ok is clicked on the pop up msgbox asking to Quarantine items, pause again on say 85% and msgbox say Cannot be repaired, try restart and run anti virus software.
View 14 RepliesI have a VS 2008 VB.NET Solution, which is quite large. Every once in a while, if I take latest code from source control, I get hundreds of errors. These aren't real errors. They are all about classes not implementing functions/events from interfaces (which they DO implement).
"Class [class name] must implement [event or function name] for interface [interface name]"
I usually end up spending couple of hours doing a combination of: building/rebuilding the solution project by project, cleaning the solution, deleting everything locally, taking latest... etc. At some point, everything just magically builds.
This was an experiment to see if I could create a fake array using generics instead of using an array. I decided to try it, because I may use it if I find any advantages to using it over an array. it works, I am just asking for a second or third opinion, have I screwed anything up, or is there an easier way to accomplish this? If I use it, it will be for a 2D game I am creating, and is used to draw the 2D screen graphics, placing an image based on what image identifier is located at what coordinates. The value stored in the fake array is an integer that disignates the graphic to draw and whether it is passible or not, i.e. 0 = a floor image, 501 = a wall image that is impassible (any image number > 500 is impassable) The Class definition:
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i am just trying to apply inheritance ..Below is my Code ... on which i am not getting the output on my Text_Box ... when in write it in a Child Class
Imports System
Imports System.Windows
Imports System.Windows.Forms
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Has someone a hint what I'm doing wrong in VB.Net?
Module Module1
Interface ISearch(Of T As ISearchResult)
Function ids() As List(Of T)
End Interface
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The third cast isn't working. Why? did I miss a oop lesson?
What's the choice design that microsoft do that? Of course, as of me, I don't use inheritance a lot, or at all.
View 14 Replieswe have 3 classes:Class S, class A, class B / A and B inherits S.A has a property A1 and B has a property B1.we also have a collection of objects that has A and B objects.ex.
Dim c as Collection = new Collection
c.add(new A)
c.add(new B)
Now we want to make a general object that will read from the collection.
ex .
Dim obj as S
how can we cast obj in order to see properties A1 or B1 according to the class;
Form1
Public Class Form1
Private Sub But_Bell_Click(sender As System.Object, e As System.EventArgs) Handles But_Bell.Click
MessageBox.Show("Ding a ling")
End Sub
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Where has the whistle button gone? The class part of the inheritance has works because you can access it via code.
Why VB.NET (vs C#) does not "inherit" the constructors with parameters?
Public Class StopLine
Inherits Microsoft.VisualBasic.PowerPacks.LineShape
Public Sub New()
MyBase.New()
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I'm facing a problem regarding multiple inheritance in VB.net:As far as I know VB.net does not support multiple inheritance in general but you can reach a kind of multiple inheritance by working with interfaces (using "Implements" instead of "Inherits"):
Public Class ClassName
Implements BaseInterface1, BaseInterface2
End Class
That works fine for classes but I'd like to have an interface inheriting some base interfaces. Something like that:
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What are the situations and their associated benefits of using Generics over Inheritance and vice-versa, and how should they be best combined?I'm going to try to state the motivation for this question as best I can:I have a class as shown below:
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Now suppose I have a repository that takes an InformationReturn argument, that has to strore different fields in a DB depending on the type of Info object T is. Is it better to create different repositories each for the type T is; one repository that uses reflection to determine the type; or is there a better way using inheritance capabilities over/with generics?
I have a base class ("MyBaseClass") in a project called "BaseFramework" which is included in several solutions within the company. There are several derived class's in various projects throughout the company that inherit from "MyBaseClass". If I then create a List and add derived class's to it, it will not serialize. I realise that if I were attempting to serialize this list, and the base class and derived class were in the same project, I could simply apply the "XmlInclude" attribute to the base class and include all of the derived class's. This is however not possible across projects, because that would require a circular dependency.
View 1 RepliesI searched quickly and not find an explicit answer at the following question:Why VB.NET (vs C#) does not "inherit" the constructors with parameters?
Public Class StopLine
Inherits Microsoft.VisualBasic.PowerPacks.LineShape
Public Sub New()
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How can I convert following code to VB.NET?
class A
{
public int NumberA { get; set; }
}
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In VB.NET there is problem with Implements keyword after property declaration. So I need to do something like this:
Class B
Inherits A
Implements IC
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But there is duplicit misleading property NumberA1.
I have the following code; now i set a propertygrid.selectedobject to the Square object, and start changing the Squares properties. If i change the [Position.x] or [position.y] values in the propertygrid the [Position] and [center] properties update correctly, however when i change the [Center] property, neither [Position] or [Position.x] or [Position.y] update. Is there something else i must do to get this to work both ways. Maybe something is lacking in PointFConverter?
Imports System
Imports System.Collections
Imports System.Drawing
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I have a parent class and many children class, right now it look like this:
Public Class Parent
Public Property ID as String
End Class
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What I need is a strongly type list List(Of Child) that Inherits from ListOfParent (I need the FindByID method) but I can't find the right syntax.
get around lack of multiple inheritance
View 2 RepliesI am currently working on a framework for applications developed by my company, my boss wants to have a switchboard and a MenuStrip, where the entries and their actions are controlled by a database.
Now I've dealt with all the code to get them working. But the problem that I am facing is that I have duplicated code because each of the classes have the code that deals with ensuring the user has the right privileges and the code to deal with when a user clicks on an item.
Normally I would move this code out into a class and then have each of the classes inherit from the class, but because the switchboard already inherits from the Form class and the customised MenuStrip inherits from the MenuStrip class.After doing some Googling the only answer I have been able to find it using an interface for the functionality, which is obviously not exactly what I want.
Anyway I was just wondering whether any one had any suggestions on what I could do to deal with this problem, as I would like to avoid having duplicate code as much as possible.
I have a library of graphical controls used to display values from a remote device. The controls are typically graphical objects such as a digital meter, analog meter, vertical bar, etc. I first create these controls with a value property. The control will display the value property, e.g. the meter needle will move to the position representing the value.
The next thing I do is to create a new control that inherits the previous discussed control. The new control adds properties that allows the value to be set from values retreived through a communication component. My code that does this is 99% the same for all of the controls. Since I already inherit the graphical control, I can not inherit the class that retreives the values from the communication component.
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I was wondering if it is possible to have dependent types in VB.Net 4, or alternatively, if it is possible to construct inherited objects based on the base class' constructor's parameter(s). For example,
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