Non Visual Inheritance Of WinForms?
Sep 21, 2011
I have two Forms, which have similar Functionality (i.e. an amount of similar Controls) but complete different Layout. So the normal inheritedForm (which VS2010 provides) wont work here.
I have tried following:
Public Class BaseForm
Inherits System.Windows.Forms.Form
Friend WithEvents Button1 As System.Windows.Forms.Button
[Code].....
So it looks like, the Designer only tries to guess how the Form looks like by inspecting the top-most Class, without compiling the full inheritance-Tree...
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Jul 26, 2009
I am working on a wizard form framework that will allow me easily create wizard forms.I have a WizardForm form that has a panel on it. My plan is to dynamically load UserControls into this panel on the form.Each UserControl that is loaded onto the form panel must implement certain properties (allowNavigateNext, AllowNAvigate previous etc.). So I have created an interface to enforce that contract so that any custom user control can be used in the wizard as long as it implements that Interface. So far so good. created my first user control. I implemented the interface. All was good.I went to do the second user control and I realized that this second user control would have the EXACT SAME implementation of the interface as the first User Control. So...I thought...aha...duplicated code...how can I get rid of that.
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Oct 30, 2008
I'm working on an application which has a common window hierarchy with menus and worked ok on vs2003, but now I'm on VS2008 sp1 trying to generate the same hirarchy and I'm amazed that visual support for differents controls like the menustrip are not working. I've been investigating, and so far it seems that the answer to my question is "it's not supported".
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Oct 23, 2011
I'm developing a VB app, part of which has a 'diary page' metaphor. The page is a panel and I want to put be able to put several different kinds of events on the panel. I've used a User Control for the first type, which works well, and it occurs to me that this and the other events have many properties and methods in common.
So I am wondering if it is possible or desirable to create a 'base' user control with the common properties and methods and have the other events inherit from that? (I am using the word event in the sense of a meeting or workshop rather than a Windows event).
I know one can do Visual Inheritance from a form and I've made a first attempt at applying the same process to my User Control, but when I open the 'inherited' control in the designer, all the properties are disabled and child controls are locked, even though the access modifier is 'Protected'. But I am still feeling my way with inheritance and I'm probably doing something dumb ...
Another approach would be to use MDI, but that feels a bit 'heavyweight' for this app ....
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Apr 16, 2010
I am trying to create an infrastructure library to be used by all my projects where one of the project in that library contains the base forms for different things like ViewBase, EditBase, SearchBase & DialogBase. They all are inherited from a Base form which contains a toolstrip control with 3 common buttons for OK, Close & About.Now depending on the type of base form I would like to add few more buttons and controls on the toolstrip during the design time. For example the SearchBase would have a Search, Clear buttons and so forth and so on.
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Jun 18, 2010
Why is it that some components/controls will not be inherited visually in a child form if they are declared with the access modifier Friend vs when they are declared with Protected. For example, I've got a DataSet object in my Parent Form that was initially "Friend" (I drag and dropped it to the form, so it was shown as a control in the designer view), but I noticed that my Child Form did not inherit the control as expected. Once I changed it to "Protected", it showed up in my Child form as expected.I am aware that Protected allows the Child Form to modify the inherited control, but how exactly does this tie in to the issue I described above?
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May 27, 2011
I have 4 WinForm app. Form1 inherits from baseForm, Formv2 inherits from Formv1, v3 from v2, v4 from v3. There are about 2 thousand controls spread across many tabs that contain tabs.
This is really killing Visual Studio 2008, frequently causing it to crash, and just terrible performance in general.
I want to create a FormV5 that inherits only from baseForm but contains all the visual layout of formsv1 through v4 (all of them), (there are no controls on baseForm).
The differences from form to form are mostly adding new controls, with some older controls having to be moved or hidden, and or a few labels changed here and there.
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Feb 26, 2012
What can you suggest on how to make a CMS quiz in visual studio (Winforms). It is possible in WinForms alone?
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Mar 5, 2012
i've created a very simple .exe file on my project in vb winForms but i don't know if i have crystal reports, Database, .swf files on my project.
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Mar 3, 2012
do i make a program in visual studio winforms that when i upload files like (.docx,.doc, .pdf files, .swf files) it will stored into a folder.Second, i saw the files being uploaded in Winforms (something like "myDocuments"). Third, when i open the files it will show the file just like in .docx it will open in ms word, .swf it will open internet explorer, .pdf files it will open the .pdf files.
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Sep 24, 2011
I have to run a thread create in the code.In the form1 i have a button that run the new separate thread for elaborate some data, so i need it for not freeze the form.I have inizialized thread:
dim th as thread = new thread (addressof elaborate)
And at the button.click event:
th.isbackground= true
th.start()
Now, at the form load i have iconized my program, but when i start new thread the tray icon is duplicated from it. I want to resolve that when start new thread it's not show new notifyicon.
(i don't have found anything online, only Multiple notification icons appear when using multithreading)
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Feb 26, 2012
I have a list of .txt, .doc, .pdf on my listview. How do i code this problem;
1. When i double-click the item (sample.txt) on my listview it will open in a notepad.
2. When i double click the item (sample.docx or sample.doc) it will open the MS word and shows me the things written on the particular item.
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Mar 4, 2012
I've decided to learn Visual Basic .Net as this is what some of my colleagues work with, and this will allow me to work with them on projects.I have purchased Microsoft Visual Basic 2010 Step by Step and downloaded the sample files. When I am trying to debug the first sample application (a Windows form), it is telling me that it can't load System.Drawing V4.0.0.0. However, if I create a new Windows Form application (C# or VB.Net) this works fine.
I had a look at the References tab in the project settings and System.Windows.Forms is referenced, but the version referenced is 2.0.0.0. I have removed and re-added this reference and it stays at 2.0.0.0 and I still get the error.Does anybody have any ideas as to what may be going on?
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Aug 11, 2011
I hope I got all that in this question title. Let me explain. We are starting on small desktop app that will snowball into a big app with many forms. The database is SQL Server. It will have classic stored procs/functions performing classic CRUD functions. Given a table or stored proc in SQL Server what is the quickest way to create a form with all the hooks to maintain a table.
For e.g. lets assume I have table like this (most code below is pseudo code)
Table Employee
{
Name varchar(30)
DOB Datetime
Address varchar(100)
}
From this as source I want to create my Target which is form with 3 labels and 3 textboxes with add delete modify buttons (or OK button to add if not exists or modify if exists)
[Code]..
The code generation tool or technique that will be used should generate the correct db hooks (create SQL parameters, SqlCommand, execute sql.. basic try catch etc. Is there any open source tool to do this ? Some trick or templated approach via VS 2010 ? Worst case any third party tool ?
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May 28, 2010
Is it possible to set a project default for VB.NET winforms projects so that the default Modifier for controls added to winforms is Private (not Friend)?I know there's a "modifiers" property in the properties window so I can set it for each individual control however I would like to change the project so from now on myself and other developers have to specifically decide to change from friend to private. (Which I would strongly discourage them from doing).I believe there is no way of doing this, but on another forum a while ago someone mentioned it would be possible with an add-in (but didn't name the add-in or where to get it).
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Apr 22, 2012
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
[code]....
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Jul 14, 2011
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
[CODE]...
The third cast isn't working. Why? did I miss a oop lesson?
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Mar 2, 2011
What's the choice design that microsoft do that? Of course, as of me, I don't use inheritance a lot, or at all.
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Oct 21, 2011
we 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;
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Apr 20, 2011
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
[code]....
Where has the whistle button gone? The class part of the inheritance has works because you can access it via code.
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Jun 29, 2010
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()
[code]....
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Apr 15, 2011
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:
[Code]...
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Apr 28, 2009
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:
[Code]...
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?
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Jul 19, 2010
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.
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Jun 23, 2011
I 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()
[code].....
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Jan 6, 2012
How can I convert following code to VB.NET?
class A
{
public int NumberA { get; set; }
}
[code]....
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
[code]....
But there is duplicit misleading property NumberA1.
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Jan 19, 2010
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
[code]....
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Dec 14, 2011
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?
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Aug 24, 2009
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
[Code].....
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.
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Nov 5, 2009
get around lack of multiple inheritance
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