Create New Form Constructor?
Feb 28, 2012How come when I create new instances of a form and show it, it loads the form twice?[code]...
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Create Application For The BMP Constructor?
Feb 7, 2012I trying create Application for the BMP Constructor, I already write the code in C# but I can't translate it into VB.NET, because its require pointer, and as far as i know, there are no pointer function in vb.net @@ so how I can translate this:
FileStream fs = new FileStream(OJSPathBox.Text, FileMode.Open);
BinaryReader rdr = new BinaryReader(fs);
int width = 555; // its just for example
int height = 555; //its just for example
[code]....
ptr declaration is using Pointer and I throught, there are no unsafe in vb.net, how I can translate to vb.net language?
Pass A Delegate Into A Constructor Of An Abstract Class From A Descendant's Constructor?
Feb 15, 2010I 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.
How To Create A Generic Constructor - BaseClass.FromXml
Mar 19, 2010How can I create a generic constructor? (ie. BaseClass.FromXml(<param>). I'm not sure how to describe this but I'm trying to create a base class that contains a shared (factory) function called FromXml. I want this function to instantiate an object of the proper type and then fill it via an XmlDocument.
For example, let's say I have something like this: [Code]
I'd like to be able to do something like this:
Dim myObject As CustomObject = CustomObject.FromXml(source)
Is this possible?
Why Is Constructor Call Valid Only As The First Statement In An Instance Constructor
Nov 2, 2009what's the rationale behind this limitation: Constructor call is valid only as the first statement in an instance constructor i want to pass an argument to my constructor which validates this argument and calls mybase.new according to this argument but it doesn't let me
example:
Public Class prob
Inherits System.ApplicationException
Public Sub New(ByVal problem As String, ByRef inner_exception As Exception)
[code]....
Make Constructor Public And Allow Anybody To Create An Instance Of Class?
Apr 6, 2009I have a class inside a class.I need to expose the properties of the 2nd class to other classes, therefore it is public.However, I do not wish other classes to be able to create instances of this 2nd class, it should only be instantitated from its parent class.I thought I could resolve this issue by making the constructor of the 2nd class private, but this even prevents the parent class from instantiating its child class! How can I work around this, do I have to make the constructor public and allow anybody to create an instance of the class?
View 3 RepliesC# - What Is Startup Form Constructor
Feb 16, 2012I need to put following code in the Constructor of my startup form.
JohnKenedy.BusinessSQLEXPRInstaller _ins = new JohnKenedy.BusinessSQLEXPRInstaller(" _ <Installation Display Name>", "localhost", "<New database instance name>", _
"<new database name>", "<database password>", "<database backup filename>");
if (_ins.IsDone == false) _ins.ShowDialog();
if (_ins.IsRestart == true) {
Application.Exit();
this.Close();
return;
}
But I really do not know what the Constructor is and how to access it?
Call A Method And Define It From The Constructor Of A Form?
Nov 12, 2010I 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?
Constructor Returning Data To The Calling Form?
Jun 7, 2010I have a MDI app that I am creating. It, of course, will have multiple MDI child forms. In each child form, I have an options button so that each child form can have it's own set of options. When I click the options button it opens an Options form. This options form is not an MDIChild.
I have a class that contains the child forms options. I pass this class to the options form using a constructor. This is how I call the options form:
Dim dlgPatternOptions As dlgOptions = New dlgOptions(thisPatternOptions)
thisPatternOptions is the class that I am passing to the Options Form.
This works fine and the options form does populate the options correctly. The Options form constructor is this:
Public Sub New(ByRef thePatternOptions As CanvasOptions)
Me.InitializeComponent()
Me.txtCanvasWidth.Text = thePatternOptions.CanvasWidth.ToString
Me.txtCanvasHeight.Text = thePatternOptions.CanvasWidth.ToString
End Sub
I change the options in the options form. How can I get those changes back to the calling form? Do I need to somehow pass a handle of the calling form to the constructor to get the changed values back to the calling form? Is there some way to pass a handle to the options form so that changes made to options will be pushed back to the calling form?
VB - Constructor - Use To Populate Other Data Fields On The Form
Jun 20, 2011CODE:
This tells me "End of Statement" is expected. I'm trying to instantiate a new form, and I'm trying to pass information into the form that I will use to populate other data fields on the form.
I've tried looking up constructors, but I can't find where my is different than other examples.
VS 2010 - Form Constructor Recursion Exception
Aug 15, 2010I developed an app, tested on few computers and all seemed fine. But now, some people suddenly get an error, which I can't repeat on my computers. Part of the exception:
** Exception Text **
System.TypeInitializationException: The type initializer for 'NumoABC.functionsBurtuSummas' threw an exception. ---> System.InvalidOperationException:
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.'
at NumoABC.My.MyProject.MyForms.Create__Instance__[T](T Instance) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 180
at NumoABC.My.MyProject.MyForms.get_MainForm()
[Code] .....
The If Me.Created = False Then is because while the form is loading, some events fire the updatePersonDataHandlers() sub, but I don't want it to happen until form is fully loaded. In the module functionsBurtuSummas line 2
Module functionsBurtuSummas
Private f As MainForm = MainForm
I have many modules who work with the MainForms' controls, so I use a private variable f to refer to the MainForm.
Winforms : Where Is Default Constructor Of A Windows Form
Jan 1, 2011where can I find the default constructor of a windows form? I mean:
Public Sub New()
End Sub
I should say that I Use Visual Studio 2008 as my editor.
Pass Constructor Arguments To Application Main Form?
Oct 23, 2010I've constructed a custom System.Windows.Forms.Form that requires arguments to New. I want to use one of these as the MainForm in a Windows Forms Application. How do I get the Application Framework to pass those arguments as needed?
View 1 RepliesConstructor String - Create An Object And Use The Object To Display All Methods
Sep 21, 2009Under component services, a COM+ component is used by the company, right-clicking it and choosing 'Activation' tab will show the 'constructor string' that is used for DB server connection by all applications. How can I access it the simplest way possible?
[Code]...
Why STRING Does Not Have A Parameterless Constructor To Create An Empty String
Feb 4, 2012I was trying to call a method using Reflection on a method that has a STRING parameter.However a STRING does not have a parameterless constructor.So instead of something like.>>
Option Strict On
Option Explicit On
Option Infer Off
Public Class Form1
[code].....
Create A Windows Form Application Program That Can Create Games Something Like Gamemaker Or Klik?
Aug 4, 2010Hello I want to create a windows form application program that can create games something like Gamemaker or Klik & Play (butt less advanced) with D&D "Drag and Drop" events and actions.
View 7 RepliesCreate A Create A New Connection To Database And Produce A New Dataset For Form?
Apr 17, 2009I have produced an application which works with datasets but I now wish to provide the user the ability to add and admend records within the database.But i wish to do this in a seperate form.My current dataset instanciates classes onLoad.Should i try passing the Dataset to the new form class? although I have the problem where by when i pass the dataset to the form class using code below i get this problem:[code]Should i just create a create a new connection to the database and produce a new dataset for this form? or is there a better way to do this?
View 2 RepliesSQL Data Access: VB2008 / VB2010 - WinForms - Create A Datasourse And Drag / Drop Fields Or Tables On A Form To Create A Grid
Oct 22, 2010I have used VB (versions 2 - 6) through many years; however, I am crash-course training myself into the VB2008 / VB2010 world kicking a screaming. I would like suggestions as to what SQL database access method should I focus more on in my learning process without making me feel that I'm a million years behind. I know I have WinForms where I can create a datasourse and drag / drop fields or tables on a form to create a grid (not really what I'm looking for).
My trouble isn't so much designing the form but in how I access the database. Theres XML, LINQ to SQL, ADO.NET, and many other methods. Not only do I need to grasp these methods quickly but I also need to know what type of projects I should create. What I mean is...I was thinking that I would design a WinForm app; however, I see that there are WPF apps and others to chose from. This is getting deep. I know it depends on the project that I'm working on. My plans are to write an app based off of either an SQL Express 2008 or SQL Server 2008 database. This first app will be standalone for now but may later become multi-user. I know I'm far behind on my learning curve coming from VB6. I have read a bit on VB2005 / 2008 / 2010. I own
both VB2008 and VB2010. I use VB2008 at work. I know ADO.NET is still alive but by what I read online, it's a dying method and is only kept for backward compatibility. XML and LINQ to SQL and other methods are all pretty new to me.
2003 Control On Child Form To Create Event On Parent Form?
Oct 28, 2010Here is the pertinent part of my code:
Public Class Form1
Inherits System.Windows.Forms.Form
Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code].....
Create A Form Where The Web Browser Only Takes Up Half The Space Of The Form?
Jan 19, 2010I tried using the web browser control for the first time.The problem I had was that the size of the web browser defaulted to the size of the form. Even when I tried to downsize the webbrowser ( via properties ) it still filled the entire form. I also tried to drastically increase the size of the form( again via the form's properties ), the web browser still filled the entire form. how to create a form where the web browser only takes up half the space of the form.
View 1 RepliesCreate A Stopwatch In One Form And Another Form Show My Progress Bar Using A Combo Box
Nov 11, 2011Im trying to create a stopwatch in one form and another form show my progress bar using a combo box for mins and seconds to show the progress bar on form1 1
[Code]...
Create An IMAGELIST In A Main Form And Add To It Then Have It Accessible Within A Child Form?
Mar 22, 2011I want to create an IMAGELIST in a main form and add to it then have it accessible within a child form. I found several MS examples on database shared access but this is NOT the concept I am after. Straight forward:
Child_Form.<function_to_execute_in_child_form>(The_Passed_Imagelist)
So, within the child form it want to do whatever I like to the IMAGELIST! I have tried passing the object by reference and anything I could think of.
Create New Instance Of A Form That Does Not Close Then The Parent Form Closes?
Oct 28, 2009I have been making a webbrowser for a while now, everything works well, except i am unable to make the 'open in a new window' button work right. So far i have managed to get a new instance of my form to open with the right url, but i am unable to keep that new form open when the orginal parent form closes.
Code:
Private Sub WebBrowser1_NewWindow(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles WebBrowser1.NewWindow
e.Cancel = True
Dim Href As String
[code]....
Create "a Windows Form Game Called Yahtzis Which Uses Five Dice And Three Throws To Create A Score"?
Oct 18, 2010i am suppose to create "a windows form game called Yahtzis which uses five dice and three throws to create a score" .
The problem is that i don't even know how to start it can anyone shed some light.
Forms :: Create An Attendance Form In Windows Form?
Oct 1, 2009How to create a Attendance form in windows form.The form should lookk like this:
1 2 3 4 5 6 7 ..........till 31 or 30 based on month selected
1. emp1
2. emp2
I shud be able to enter attendance for employees.....
C# - Attribute's Constructor Run?
Jul 22, 2009When is it run? Does it run for each object to which I apply it, or just once? Can it do anything, or its actions are restricted?
View 3 RepliesCode The Latter Constructor?
Apr 1, 2010A project has a class (CAR Class) with the folloiwng details and the CARADMIN cLASS with the following details: The cardAdmin class has 2 constructor Public Sub New() & Public Sub New(ByVal rec As Rectangle) I dont know how to code the latter constructor..
cAR Class has this method/properties:
Public Class Car
Inherits HVSprite
Private fSoundFile As String
[code].....
How To Call A Constructor From Another
Jun 27, 2009I have a defualt constructor that has a object of a Database connectivity class:[code]therefore in theory i have to call the defualt constructor of Question from overloaded constructor. [code]How every in realitty is it possible to call the defautl constructor from the overloaded constructor
View 5 RepliesHow To Convert Constructor To C#
Aug 17, 2010Do not know how to convert Me.Base to C#Imports Microsoft.VisualBasic
Public Class ReplaceHTML
Inherits System.IO.Stream
Private Base As System.IO.Stream
[code].....
Pass Value Other Than From Constructor?
Jan 23, 2009how to pass value other than from constructor.
In my code....value are usually passed through constructor.
ie everything is declared in constructor and while executing, these values are defined in new object.