Prevent Creating New Class
Mar 12, 2011I am making a class that will behave like a collection class. I want to prevent the end-user from creating a new class of this. For example, the following should give error:
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C# - How To Prevent Class 'a' From Being Inherited By Another Class
Jul 31, 2010i have a class named fdetails and i do not want any other class to inherit from this classCan i set it to not being inherited by another class. I would like to get the things done in the following 3 languages
View 6 RepliesPrevent Class 'a' From Being Inherited By Another Class?
May 23, 2010i have a class named fdetails and i do not want any other class to inherit from this classCan i set it to not being inherited by another class. I would like to get the things done in the following 3 languages
C# - Prevent Designer Class From Being Rebuilt?
Jul 19, 2010Is there any way that I can prevent a designer class from being rebuilt when running my project? The designer class is a webservice reference with over 30000 lines of code and appears to be being rebuilt almost every time I run my project. (Which obviously takes quite some time)
Is there some explicit way I can prevent Visual Studio 2010 from rebuilding this class each time I run the project?
Any Way For A Class To Prevent Outside Code From Declaring Variables Of Its Type?
Jan 6, 2011Is it possible for a class of exposing a type for function returns, without allowing users of that class to create variables of that type? A couple usage scenarios:A Fluent interface on a large class; a statement like "foo=bar.WithX(5).WithY(9).WithZ(19);" would be inefficient if it had to create three new instances of the class, but could be much more efficient if the WithX could create one instance, and the other statements could simply use it.A class may wish to support a statement like "foo[19].x = 9;" even when foo itself isn't an array, and does not hold the data in class instances that can be exposed to the public; one way to do that is to have foo[19] return a struct which holds a reference to 'foo' and the value '19', and has a member property 'x' which could call "foo.SetXValue(19, 9);" Such a struct could have a conversion operator to convert itself to the "apparent" type of foo[19].In both of these scenarios, storing the value returned by a method or property into a variable and then using it more than once would cause strange behavior. It would be desirable if the designer of the class exposing such methods or properties could ensure that callers wouldn't be able to use them more than once. Is there any practical way to accomplish that?In formulating a question, it's difficult sometimes to draw the line between complicated usage cases, and simpler usage cases which aren't quite so important. Here's another usage case, and one closer to the one I'd be most interested in (though I'm also interested in Fluent chaining; being able to have something behave like a C++ reference to a value type would be nice, but probably too much work to bother with).I have a type which is somewhat like the Windows registry, in that it is a hierarchical collection of items, each of which may have a string value, an integer value, and/or a nested collection of items. I wish to be able to support the following types of usage:[code]As for the Fluent interface, my thought would be to have the WithXXX properties return a new instance of a derived class which shadows (not overrides!) the WithXXX properties with versions that simply modify the current instance. The return object from WithXXX would be known to be of the derived class, and would thus use the shadowed WithXXX methods, but once it was assigned to a variable, it would be regarded as an instance of the base class, so the next WithXXX would create a new instance.
C++ a stronger concept of value types than C# or vb.net, including the very useful concept of references to value types; it ensures that references to value types cannot be persisted outside the scope of the type in question. Unsafe code in C# can use pointers to value types, but they don't have the protections offered by C++ references.
Creating An Instance Of A Class From A Class Library?
May 18, 2010I've createda vb.net class library where I've defined a number of small classes... nothing complicated, just working with strings, sending emails, etc.In another project, I reference the class library and I'm seemingly able to create an instance ofone of tclasses - intellisense shows me all of the plic properties, methods, etc... all looks perfect. No compile errors at all, nothing b gumdropsand lollipops.When I run the app I'm working on that references the class library, it fails at the point where I'm creating an instance of the class and gives me a vague exception, "System.TypeLoadException".
View 2 RepliesPrevent The Class Library's Files From Being Opened During Main Project's Debug Mode?
Jan 24, 2009I made a Class Library project that contains the main classes that my Main Project needs because I don't want to main classes when I distribute my project. I've successfully called and used it in my Main Project. But when I started debugging and stepping through my code which involves calling and using the class I wrote in my Class Library, I noticed that the class' file in my Class Library opens up during debug mode.
how can I prevent the Class Library's files from being opened during my Main Project's debug mode?
Creating An Exe And Best Use Of A Class?
Aug 2, 2010I have a project where I need to create an exe that will execute through a scheduler every five minutes The visual basic file will call a SQL Stored procedure, get values and then write these values to a separate database system (that is NOT SQL).
View 4 RepliesCreating A Class And Referencing It
Feb 20, 2009how to create a class yet, and I think I need to learn how.I am wanting to shorten my code in a form, thinking of creating several classes to do so.Lets use a Listview as a reference if you dont mind.Say there is a listview, you have a numeral amount of if statments to fill by. Is there a way to create a class(is this the way to go) so that you can open the class to modify that specific block of code? Example of questionYou have multiple items you need to add for each if statement. Animal as a group Dog as an item 14 years as a sub item Cat as an item 11 years as a sub itemIs this the way to go, if so how do you create a class and call it from a form?Davids Learning
View 4 RepliesCreating A Combobox From A Class?
Jan 30, 2012my query is:
file: read.vb
Friend Function Nav()
Dim NavBox As New ComboBox()
NavBox.Size = New System.Drawing.Size(44, 21)
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Now what i need is, a access to its control so i can parss value from mainFrom.vb to read.vb to manipulation the SelectionChangeCommitted activity.
Creating A Datagridview Class?
Jun 18, 2012I have a one form with code that has lots of subs and was wondering if i can shift some of these subs to a class or module to make the main form coding less clutered.
View 4 RepliesCreating A Dice Class
May 24, 2010I'm working on the code I used to make the animated dice program in my sig. I've done a bit of modding on it so I can re-use parts and it still worked fine, until I tried to put everything in a class so that I could just create new instances of a certain die.
I was heading towards the idea of creating a new instance of the die by a number in a textbox on the main form. Right now I am just working on the basic d6 just to get it up and running.
QuoteAn error occurred creating the form. See Exception.InnerException for details. The error is: The form referred to itself during construction from a default instance, which led to infinite recursion. Within the Form's constructor refer to the form using 'Me.'
I am probably going about this the wrong way all together and could use some help because I can't see how the class is referring to itself at all.
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doesn't look much better in the original program, but it actually works in that so if it helps just click the link in my sig to go to the post with the original download.
Since I am going to want all the various dice to Rotate() and Move(), I am wanting these to be generic so that I can use them no matter which die is trying to access it which is why I have tried putting them separately in their own subs and just passing the picture ByVal. I'm not sure if, or how, to put these in classes of their own or not.
And I have looked at just about every dice roller and Yahtzee example I can find, but none of them actually try to rotate the dice like I have, and they pretty much just calculate by using simple random values...which is okay, but does squat when the values are actual objects instead of numbers (if that makes sense).
Nothing I can find tries to put this stuff in classes, which makes it even harder to determine what really should go in the class files themselves. I really just can't find an example that I have been able to get to work for my purpose, nor figure this out on my own.
Creating A List In A VBA Class
Nov 18, 2011I would like to know how I can get the list of possible choices to Intellisense for my class object, like it does with MsgBox.For example, when creating a message box you type MsgBox "Test Message Text", vbYesNo, "Test Message Title".In typing that, when you type the comma just before the vbYesNo, it gives you the possible selections for button types in a drop down list: i.e., vbYesNo, vbOKOnly, etc.I have a class called clsKeyState. what it does is turn on/off/toggle key states, such as CAPS LOCK, SCROLL LOCK, NUM LOCK, etc... I have set my property for it as Get/Let "State". When I call it to set a key to on/off I will be doing it like this: KeyState.State WhichKey, On/Off/Toggle.I would like the WhichKey part to automatically display all the possible selections that I define, such as CapsLock, NumLock, Scroll Lock; and I want the On/Off/Toggle to display those specific items also (On, Off, Toggle). I will be using the ability to create these displayable options for many more things in my project than just this one simple class.
View 3 RepliesCreating An Array Of Class
Jan 15, 2012How can I create an array of a class that I have declared? I have this class named partswith properties of frame, engine and date, and i want to know how could I store them in an array .
View 1 RepliesCreating NEW Construct In A Class?
Dec 31, 2009I have an application in VB.Net and now I find out an API is not compatible and requires VB6. I am trying to convert it back to VB6 and have an issue in a Class Module. In VB.Net, I have:
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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
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.net - Creating Geometric Shapes As A Class?
Apr 17, 2011how do I create a geometric shape as a class? Visual basic has a Rectangle class pre-defined object that I would like to use, but I need to use a rectangle class that can use decimals for the 4 points to set its location. I do not want to draw a shape on the form for graphical reasons but I want to use the shape for an algorithm, how can I create a class for a rectangle using decimals?
View 1 RepliesCreating A Class That Contains Other Classes/Objects?
Aug 27, 2010I'm wondering on how you would go abouts instantiating a class that contains other complex objects. for example an Payment Class which has Date,Time, etc.. and it also holds a reference to a paymethod object which has id,Type,Description etc.. How do you instantiate the payment class with all the other objects without one or the other failing, how do you create the payment class which doesn
View 4 RepliesCreating A Partial Class For A Form?
Nov 30, 2010I would like to create a partial class for my form. I have a lot of events, and it gets messy, so I would like to break up sections into their own files. The problem: When I create a partial class of my form, say:
Partial Public Class Form1
End Class
Visual Studio decides I need another form for this partial class.
1. How do I create a partial class for a form?
2. If I cant do that, how can I break up all the events in my form into different files?
Creating A Proxy Class From Wsdl?
Feb 9, 2009I am a complete Newbie to VB.NET and am migrating up from VB4, so please forgive my mistakes.I am trying to create a proxy class using the WSDL tool included in Visual Basic 2008 Express Edition. I have managed to create the file successfully through WSDL tool, and then am able to add this file as an item in my VB project, however, the file that is added, comes up with 11 errors that I am not familiar with. The command I am using to create the file with WSDL tool is as follows:
wsdl /l:vb /protocol:soap http://direct.racetab.com.au/LiveOdd...gin/Login.wsdl This creates a file called Login, however it creates it, inside the folder that the WSDL tool is located in, which happens to be:Program Files/Microsoft SDKs/Windows/v6.0A/bin I then go to the solution explorer and right click the 'My Project' folder and select ADD>Existing Item, and then navigate it to the file that was just created.
This creates a new item in my solution explorer called Login.vb however, as soon as it is created, I get 9 errors and 2 warnings, that absolutely confuse the hell out of me, and all point to this new item 'Login.vb'
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I am doing wrong, what I have forgotten to do, or how I can work to get around this problem? If I need to supply any more information, please let me know what you need to know. Also, if it helps, the only method that I plan to use from the above file is the GETKEY(userName, password) method.
Creating Custom Generic Class?
Jan 1, 2011 Here are essential excerpts for the code creating the class and the page using it:
Imports System.Collections.ObjectModel
Public Class Test (Of T as xyz)
Inherits Collection (Of T)
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Creating Instances Of Own Class At Runtime?
Sep 3, 2011info on creating instances of my own class at runtime. Simple project for family recipes but would like the option to add new recipes with new instances of my own food Item class at runtime. Creating my own class,no problem. Storing the data in an XML file, OK on that as well. My issue is creating new instances of different food item class as I use this program over time
View 13 RepliesDynamically Creating Class Properties?
Jul 21, 2011We use a common web.config file to store all of our database connection strings.
I would like to have a way to read in all of them, somehow create a property or type so that they become dynamically available.
So when I want to create a new sql connection my my class can show the connections strings available.
Dim myconn as new MySqlOps.Connection(MySqlOps.ConnectionString)
so when the user types MySqlOps.ConnectionString. it will give a list of the connection strings read in from the config file.
Not sure how to approach making the connectionstrings available like above.
Getting Error While Creating A Dll For A Proxy Class
May 4, 2010I am trying to make a DLL for a proxy class of a web service as:[code]Do i have to include system.web.services.protocols.dll but i read it is included in system.web.services.dll then why it is complaining about certain members of the class.Here "Service" is my webservice and "proxy service.vb" is proxy class whose dll is need to be created.
View 1 RepliesVS 2005 : What Is The Advantage On Creating Own Class
Aug 30, 2011What is the advantage on creating ur own class and property??when making a system like POS. . . .it is necessary to create a class or property??It is possible that I will create a module and i will declare the import statemnt in the module and i will declare ol of the mysql commnds in the module and I will open the connection in the module so that ol of my forms can see my declaration?
View 2 RepliesVS 2010 : Creating An Event For A Class?
Feb 28, 2012I have an application that tests various hardware components for notebooks. One of those components is the keyboard.I have a form that displays a keyboard. In that form's KeyPreview event, I get which key is pressed. If it's the correct key, I disable the visual UI cue and move on to the next key.I'm converting the bulk of the code into a library so that it can be used in other projects more easily. But I'm having a hard time grasping how I would create this event in my library and still allow the same functionality.
View 10 RepliesCreating A Base Class For Windows Services?
Jan 16, 2012In our application, we have a number of Windows Services (more than 30) that must run behind the scenes to process data at given times throughout the day. I was attempting to create a BaseService class that I could inherit from that would log to our database when the service started or stopped as well as some other common functionality. However, I ran into a show stopper in trying to create BaseService as MustInherit as we have a number of MustOverride properties. The issue lies in:
<MTAThread()> Shared Sub Main()
Our code is all in VB (as you can probably tell). Given that it is a Shared method, I cannot have it be overriden (i.e. make it MustOverride). Without this method, the code will not compile, however it will not really work in the base class. The code in this method is:
Dim ServicesToRun() As System.ServiceProcess.ServiceBase
ServicesToRun = New System.ServiceProcess.ServiceBase() {New BaseService}
System.ServiceProcess.ServiceBase.Run(ServicesToRun)
The BaseService (the name of my base class) cannot be created because it is specified as MustInherit. And therein lies my problem. I cannot create this in the Base Class and cannot override it in the inheriting classes.
Creating A Class That Holds/draws Some Graphics?
Jan 13, 2011Ok, I want to create a class that will handle a special rectangle graphic.In my form, I want to have two of these special rectangles.So, basically, I need two instances of that class in my form, right?I manage to initialize two, alright. But, how exactly am I supposed to manage drawing/graphics etc in a class, and the results to be displayed in my form?
View 2 RepliesCreating 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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Creating A Lot Of Class And Structure Types For A Project?
Oct 12, 2009Is there any performance hit (or other problem) to creating a lot of class and structure types for a project? I'm not talking about the number of objects existing in-memory during runtime; rather just defining a lot of object types during design time. I find myself making a lot of small classes and structures that are little more than simply packaging a few related variables together.
View 4 Replies