Startup Forms And Constructors?
Mar 5, 2012
I was able to narrow down a problem to a certain point. I was hoping for an explanation or some light shed upon it. I went to Project/Project1/Application/Startup Forms. I found that when I included a "New" constructor in the form I wanted as startup, the form became unavailable for choosing as a startup form. I do not quite understand this because I noticed from work in another document that the form I want (call it StartupForm) actually has a basic "New" construction with no arguments, so that is why I do not understand quite what is happening here.
[Code]...
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Nov 1, 2010
I would like to open a new form from some other form, and pass some selected object from a control on that form to the new form. The sensible way to do this, I thought, was as a parameter to the forms constructor. Now I know that the visual studio GUI creates partial classes for my forms, that hold the properties that I can drag onto there in the designer. I assume it also holds a default constructor. Since it might do all sorts of stuff that is needed to initialise the form, I figured I should call it from my custom constructor ala
public sub new(byval my_parameter as Foo)
Me.new()
Me.my_parameter = my_parameter
[code].....
That clearly wasn't it, because it can't find a default constructor. The thing is, visual studio goes trough great lengths to prevent me from seeing the generated constructor, so I know how to access it. This leads me to believe that I am actually doing it wrong, and should have set out on some different path, as the path you are forced in to usually is the sensible thing to do, which I usualy find out way too late.
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Oct 9, 2008
I just wanted to try something I had in mind,
Code:
Dim mTreeNodeCollection As TreeNodeCollection
mTreeNodeCollection.Add(New TreeNode("ddsf"))
above produces a 'System.NullReferenceException was unhandled' which is fine.
So I thought dam I forgot to initialise it!!
Code:
Dim mTreeNodeCollection As New TreeNodeCollection
mTreeNodeCollection.Add(New TreeNode("ddsf"))
Now it does not run but i get
Quote:
Type 'Sytem.Windows.Forms.TreeViewCollection' has no constructors
so how the hell I'm I going to get it to work?? can I only Add to a TreeNode collection , a TreeView?
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Sep 28, 2010
I grabbed an example program to modify for my needs to grab data from a Word doc and transform to XML. Right off the bat I get multiple errors. [Code] I am getting Error Type 'System.Windows.Forms.Application' has no constructors.
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Aug 26, 2010
I would like to know if its possible to start up a second windows forms inside the parent form. Ex: A button is pressed and a new form is showed. I would like to keep that new form inside the parent form, and have it not be able to go outside the parent form.
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Oct 23, 2009
In c# you can have
public class Foo
{
public Foo(string name)
{
//do something
[Code]...
Is there a VB.Net equivalent?
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Jul 9, 2009
My scenario is such that I have a VB.NET project in SVN and I am using the Application Framework to start the application. This poses a great problem when different developers are working on different forms and they want to have different startup forms. Right now if we change the project settings, its changed for everyone else too. How can we work around this? Can SVN have a class committed into the repository and later changes cannot be committed into it? (more like ignoring a file but with a initial copy in the repo)
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Mar 27, 2009
I'm using Visual Studio 2008 in vb.net. When I run my application both forms display even though I have a startup form selected in my application. If I select the first form I created the correct window is displayed, but when I select the other form to be my startup both are displayed.
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Apr 16, 2010
Is there a way I can load 2 forms on startup, but immediately hide one of them? I want to load both initially, so that there is no flicker the first time when the second form appears.
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Jun 3, 2011
I am wanting to change my startup form for my application in Visual Studio for VB.Net. I double clicked "My Project" in the Solution Explorer and then clicked on the Application tab. For some reason I only see 12 forms out of the 6 forms I have in my project when the "Enable Application Framework" check box is True. When the check box is False I see all my forms, why?
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Aug 13, 2011
I'm creating an app, with a splashscreen, loginform (just enter a name) and a mainform.With I use my.settings. Now here comes the issue I run into.The splashscreen should check (onload) if the my.settings.user contains any info, if it does, the mainform should be shown, if not the loginform should be shown. On my app settings I have splashscreen set to the splashscreen and the first form is set to login form.
[Code]...
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Nov 8, 2011
I have my main form which will have the option to hide itself and open up a mini version. I would like this mini version to start at the top-right of the users screen.I have went through other posts and understand that you can set distance from top-left.
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Jan 5, 2012
I have been searching for a solution to this but I can't find one. I have played with the anchor and dock properties but they are not doing what I want, so here goes... I would like to place and size all of my controls on my form and then when the form is re-sized during run time (different resolutions, full screen/windowed, etc), have everything just scale up or down accordingly. Anchoring the controls to all four sides of my form re-sizes the control properly but it doesn't move it's location in sync with the other control's size next to it, they begin to overlap each other. Am I going to have to code my own scaling code for each control in my program?
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Apr 20, 2012
When using POS explorer, everytime I claim my receipt printer it takes a few seconds. My question is how can i claim the device at program startup then share the device between forms? Meaning I want to open, claim and enable during program startup then use the device on certain forms.
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May 17, 2010
Trying to get it to behave like C#, where there is a Program class with a static Main method.However, in the project properties, I cannot set Program.vb to be the startup object, only the forms (it is a forms application).
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May 31, 2011
I have an MDI parent screen that loads on startup and a lot of child forms that load when opening. So as the child forms load there's a lot of flashing and it looks really ugly. Once they're loaded all I have to do is use a bring to front, maximized command and it works smoother than closing a form and opening a new one every time a different form is selected. I've tried creating a splash screen, minimizing the forms on load, etc and everything still works in order so first the splash screen then the forms load.
How would you set it up so a splash screen stays on top of all other forms for like 5 seconds while the forms load in the background without seeing them load? Right now the screen shows then when it's done it moves on to step 2 which is loading the child forms. If no splash screen, how do I make it load so you don't see all the child forms opening at once?
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Jun 20, 2010
I can hide my startup form (or make it appear hidden) on startup. I can start my app on windows startup--through registry values--if the user checks a checkbox.
But if the app starts up on windows startup, I want the form to be hidden, so the program can just keep working without bothering anyone. If it starts up because the user started it, I want the form to be showing, because the user probably wants to change some settings or something.
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Mar 4, 2010
How to make an Application to startup at the system startup? and How to enable and disable?
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Oct 8, 2010
In properites>Application>"Startup form" combobox, in my VS VB.NET project, I see only 2 forms listed, while my application has 6 forms. Does this mean something is corrupt? I tried to make a new project, then copy only the old vb files into this new project. But still only those two (of 6) forms show up in the "Startup form" combo box.
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Nov 30, 2009
I would like to know if you can have multiple constructors in a VB.NET class? Like in java, you can have multiple constructors as long as they have different parameters, is that possible here?
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Jan 17, 2011
I did not know you could do this. See Article by Dan Mabbutt
'from article - Objects, Parameterized Constructors, Anonymous Types and the With Keyword
'by - Dan Mabbutt
Class someObject
[code].....
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May 10, 2011
Coming from more low-level languages like C++, and seeing how transparent .NET memory management is, I've got a concert about a piece a line of code I've written. In C++, every object necessarily (dictated design practices and peculiarities of memory management) needs to have a constructor and a destructor. In .NET, destructors aren't needed as often, and there are different patterns of when they are required and how to use them. My question is this. If I have the following like of code (in VB.NET, but equally applies to C#)
[Code]...
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Oct 22, 2009
I tried a search, but no luck. Maybe I was using the wrong words, I don't know.Here's my question...called myControl of type CustomControl. I have a property called SomeProperty that can be set in the Properties window. If I put this control on my form and set the property's value to "a string" normally InitializeComponents would look like this:
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.myControl= New CustomControl
[code].....
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Jul 7, 2008
im converting my classic vb class into vb.net class and im having some problems with my object.Query function
here is my obj.Query Function
Code:
Public Function Query(ByVal sqlStatement As String, Optional ByRef e As String = "") As SqlDataReader
Try
[Code].....
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Nov 2, 2009
i've got a class called prob that inherits system.exception however it seems not to have inherited the constructor
Public Class prob
Inherits System.Exception
public sub stuff
[code]....
throw new exception("test") 'works Throw New prob("test") 'doesn't work is it possible to inherit the constructor into my class prob as well?
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Apr 19, 2009
1)When we use Overload constructors in a class
2)and which one is get execut first.
Public Class remoteobj
[Code]...
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Jan 5, 2012
Why I am I getting the "type byte has no constructors" error here?
Dim stream As System.IO.MemoryStream = New MemoryStream()
bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg)
Dim image As Byte() = New Byte(stream.Length
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Mar 27, 2010
In one of the VB classes I have for a moving object there are 2 Constructors in the code as below:What is the difference between these 2 constructors?what does the first & the second constructor do?
[Code]...
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Nov 19, 2009
Public Class Car
Private Dim CarName as String
Private Dim CarWeight as String
Private Dim CarColor as String
[code]....
1.) In the book I am reading it says that when the default constructor(i.e. the one with no parameters) is executed all the class level variables get set to default values based on their type automatically by the compiler. For example, all String variables would be set to empty string("") and all Boolean variables would be set to False, etc. If you look at all my constructors you will see that non of them get values passed to them for all my class level variables. So my question is for the class level variables that don't get anything passed to them(ex:CarModel), do they take the same default values as they would if the parameter-less constructor were called?
2.) Following from my question #1, is it good practice to make sure that all the constructors that take parameters make sure they set every class level variable. Should I have written the above code as follows?
Public Class Car
Private Dim CarName as String
Private Dim CarWeight as String
Private Dim CarColor as String
[code]....
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Dec 30, 2009
i've got a Class like this public Class Cart(Of Item) Public Sub New(ByVal a As Integer, ByVal ParamArray items As Item())but i do not see how to create an instance of it: Dim block_names As New Cart(Of String, 5I)i get something like "type expected" o.O
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