Passing Data Between Forms Without Any Public Methods Or Properties On The Forms
Dec 28, 2009
Passing data between forms without any public methods or properties on the forms. everything but the "Controller" class, which I would like you furnish. I just changed the title from "Intermediate" to "Beginner" This solution is an example of the Observer Pattern. The "Controller" class is the "observed" class, which in this case means it publishes events.
' File Definitions.vb
Public Delegate Sub MessageDelegate(ByVal sender As Object, ByVal e As MessageEventArgs)
Public Class MessageEventArgs : Inherits EventArgs
Public Message As String
[CODE]...
The program should initially display Form1, and Form2. Clicking of the button on either form will modify the Title Text of both forms. I think that you will find the final end result to be pretty neat, as it works with any number of open forms not just two. I think asking for the Controller class is easier than asking for the code in the forms. My solution for Controller class has 7 lines of content, 9 lines if you include Class, EndClass. A minimal solution could achieved with only 4 lines of content, but it would a textbook example of bad programming.
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Nov 26, 2011
Quite a few threads on passing data from one form to another, but I'm struggling to work out how to share data between the two - back and forth.
For example:
Class1 is a class with 10 string properties
Form1 has 10 labels ("Label1", "Label2" etc) and a [Configure] button.
Form2 has 10 textboxes and a [Apply] button.
I want to load with Form1, and create an instance of Class1. Click the Configure button and load Form2, passing Class1. On Form2 I want to manually fill in the 10 textboxes and hit Apply. The Apply should update the Class1 instance and close the form.
Form1's Label controls should then be updated with the data from the Class1 instance.
I'm fine creating the forms and classes, as well as passing the class into Form2 with a custom Sub New(EmptyClass as Class1) constructor. This gets the empty class into Form2, but how can I get the populated class back to Form1?
As Form1 already exists I don't want to create a new instance with another custom Sub New(PopulatedClass as Class1)
It's also key to be able to use the Form2 multiple times, basically ending up with a Data class being displayed as part of Form1 but updated using Form2? (For example if the Class has already been created and populated with data when it's passed back to Form2 for the second time I would pre-load the Textboxes with the values already in the class).
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Oct 21, 2009
I have a List(Of AddlInfo) with AddlInfo being an object. I'm trying to pass addlInfoList by reference into a function of another class:
[Code]...
This works if I'm not passing the reference into another class, but when I try to do this, I get the following error: Overload resolution failed because no accessible 'Sort' can be called with these arguments:
[Code]...
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Nov 12, 2009
I have a gridview on a form pulling user data. I have also created a basic login system where users login and their username/password is checked against a table in SQL Server 2005.The gridview is on Form 2 but i am having great difficulty in returning the records in the gridview for the user that is currently logged in.
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May 10, 2010
I have 2 forms. Using Visual Basic.On Form 1 there is a populated combo box. This was done so by running a query through it and populating it with PUZ_ID values from a data set.On form two there is a tool strip and below is a search query.I need to be able to select the value i want in the combo box on form 1, and launch a button that opens form 2, which has loaded the data that i binded onto the form.Anyone have any ideas/code or need me to clear this up a bit more?So i need to run something through a query, or make something public or what?
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May 10, 2010
I have 2 forms. Using Visual Studio.
On Form 1 there is a populated combo box. This was done so by running a query through it and populating it with PUZ_ID values from a data set.
On form two there is a tool strip and below is a search query.
I need to be able to select the value i want in the combo box on form 1, and launch a button that opens form 2, which has loaded the data that i binded onto the form.
So i need to run something through a query, or make something public or what?
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Oct 20, 2010
I need to pass a double from form1 to form2 and have form2 return this value back. My problem is while i can receive the proper value in form2 i can not seem to get the corrected value back in form1 (using byRef in form1). Here is the code snip
Dim AmountPaid As Double = 8
Dim newInvoiceRow As InvoiceDataSet.InvoiceRow
If (MakeAPayment.ShowDialog(AmountPaid) = Windows.Forms.DialogResult.OK) Then
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Jan 24, 2011
I have a form that has a button, when clicked it pops up a Dialog Form. Within this dialog form the user needs to select some data and when the user is finished they click the OK button. Once they click the OK button it needs to return an integer back to the previous form.I created a Dialog Form and tried calling it via the code below:
Dim intResult as Integer = frmData.ShowDialog()
Debug.Writeline(intResult)
However, it seems I can only return DialogResults (Abort, Cancel, Ignore...)I was wondering how I can try this without having to create a public variable and storing the result there.
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Jul 8, 2010
Form1 is a Datagridview which is non editable. I want a user to be able to double click and open Form2, which will allow editing BUTForm2 is a list view and also had a binding navigator so I guess I cannot use dialogue? I do not want to simply just edit in a dialogue and save.Is there an easy way to get the record from Form1 and pass it to the controls in Form2 so that the correct record is displayed?
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Jun 18, 2009
I am trying to pass data between forms on a double click operation. On Form1, I have a simple database with three fields (ProfileID(PK), Profile First, Profile Surname). The database has 10 records at present which displays all records in a datagrid view which is set to read only. I have the Selection Mode set to FullRowSelect to highlight the full row.Form2, is a form to Display one record at a time. This form allows editing and saving of changes.How would I go about coding in vb.net to firstly get the ProfileID from the relevant row and send this into Form2 to display that record for editing?
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Dec 15, 2009
Imagine a project with couple of forms and a module. Now as per my knowledge if i want to send some data from one form to another then :
- If I declare variable friend/public in a module then it can be accessed in the entire project (thus also between forms).
- If I just have to send data from one form to another, then I can call the other form's sub/function and pass value.
- If the pass value by reference then I can get new value only if its changed in that function.
Now what the issue is, I need to pass a variable to a form and in that form when user types contents in a textbox or makes other selection and presses OK button then it should return some values back to the calling form. Now how can I achieve this (without declaring global variables which will be accessible everywhere) ?
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Jul 28, 2010
I use the code
Dim Selvk As New Selvkost2
Selvk.PassedText = TextBox29.Text
Selvk.Show()
[code]....
in my second form and the text passes. but I need to pass values from 20 textboxes. do I have to copy the code in my second form 20 times an declare passedtext2 and so on or is there an easier way to do this?
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Apr 22, 2010
This is my first Windows app to create since VB6. I've been in the world of ASP and ASP.NET for many years. However, now I have been asked to create a simple app that needs to be windows based.
[Code]...
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Jun 10, 2011
I have two forms and I am running a sql query to provide a set of variables in my first form that I need to pass to my second form. Here is the code that I have:[code]to form 2 which then shows the data retrieved from a sql query in the load event to a datagrid view.
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Dec 17, 2010
Example Form1 with data bound controls and a Public Variable Form1Var.Form2 with data bound controls and a Public Variable Form2Var DataTables are related Form2 Data is related to Form1 Data in a one-to-many.What I am trying to accomplish.When editing Form1 data there is a button to open Form2 if new data needs to be added. on closing Form2 I would like Form1 to remain at the state it was in before opening Form2. If I Change Visibility of Form1 when Form2 is opened upon Retun to Form1 Data is reloaded, if I minimise Form1 when Form2 is opened upon return to Form1 Public variables are reset to defaults.I have many Forms with many controls and buttons to do Lookups or additional add to related tables.
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Aug 21, 2011
I'm getting a little fustrated, ive been trying to figure out how to allow my main from access to a sub form. what I'm initially aiming for is control of text and font color via a dialog on the main form and the results to appear on the second form, if that makes sense. Most of my knowlege resides around using VB.net for creating games and not progams. ill post the code so you guys might be able to get a better understanding of what im looking for as a result.
[Code]...
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Jul 23, 2009
My scenerio is a form with a button, when clicked opens a form dialog. The dialog allows the user to enter a text box. I want to read the value of the text box from the main form into a variable to be used with an SQL statement. The following code is used to create a new instance of the form dialog if one does not exist:-
[Code]...
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Nov 27, 2009
I seem to be running into an issue. This may seem like a noob question (which it really is, I only have experience in vb6 from years ago) but what Im trying to do is pass a variable from one form to another. Ive tried telling the first form to set the value of the variable on the second form like so frmsecond.variable = "value" but that does not work. Ive tried placing a public variable in a module to do it, but again, no luck. The only way seem to be able to get it to work is the second form setting the variable by reading the value from the first form like so [code]The problem I have with that code is what if for some reason the selected line gets changed as the form is loading or something to that nature. It doesnt seem very secure.
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Jul 26, 2011
What is the difference between the following two statements (in terms of memory management):
Dim frm as New MyForm()
frm.Show()
VS
MyForm.Show()
I am originally a C# developer, how does the second one make sense or even compile for that matter in VB.NET? (Show() is not a Shared/Static method) What is happening in the second case?
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Jan 21, 2010
How to create a data forms with the data forms wizard in VB 2005
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Jul 20, 2009
I'm trying to create classes, functions, etc that present a preset list of options to users (in the same way that messagebox control will show the available button options). A simple example is readFile(ByVal strPath as string, ByVal strFileType as string) where the user will see a list of acceptable file types when they put the comma after strPath.
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Oct 31, 2010
I want al(InitialStrength.Text) to be set as the variable iST so I'm typing this at the top of the page before all my subs:
Public Class CharacterSheet
Public iST As Integer = Val(InitialStrength.Text)
[code]....
but every time I do that and try to compile without even using the variabe, I get this error: "An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object."
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Jan 19, 2010
Is it better to use friend or public forms in vb.net? What are the advantages of each?I notice when you import a vb6 project, the forms come in as friend, but when you add a new form in vb.net it is public. I have not seen any difference in the way they work, though, so I must be missing something.
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Jul 21, 2010
control which will need to be reused in several forms in my program. It basically consists of several buttons in a panel. To start with, what I need to do is get the button values from the control into a text box on the first form. But I don't want to have a method calling the textbox directly from within the control, because then it won't be reusable in my other forms. Is there something I can do in VB like parentform.textbox.append for example, where you can generically call the methods of the form in which the control appears?
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Jun 11, 2010
i want to now how to change the access modifier of a form so that it is publiv ind=stead of friend.
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Jun 9, 2011
how to make a variable public to all forms within the application.Eg
Public MyPath = "C:"
can do for one form but not all
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Sep 8, 2010
VB.NET newbie here... I have an vb.net windows application set up. It has multiple forms, about 6 in all. There's a main menu form, and then 5 other forms to collect data. The user will collect data on each form and bounce back and forth between forms. How do I get the forms to retain the data that has been entered into the text boxes and/or other controls on the forms? For example, they might fill out a few textboxes on a form, but then need to go to a different form and fill something out... and then back to the previous form. Right now, when they come back to the form, all the data previously entered in to the text boxes is gone.
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Jan 31, 2009
my problem is that i have an MDI Parent form. it has lots of child forms. on my MDI Form i have the toolbar buttons Add, Delete and Save.all or most of the child forms, i created a custom public procedure Sub AddNew, Sub Delete and Sub Save.what i'm trying to do is when i click the AddNew in the MDI Form, it will run the custom public Sub AddNew of the currently ActiveMDIForm. i have tried...
DirectCast(Me.ActiveMdiChild, Form2.AddNew()
but i'm getting an error "Unable to cast object of type 'Form1' to type 'Form2'" if the currently ActiveMDIChild is not Form2.
[code].....
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Nov 17, 2009
In vb.net, you can address a public variable from another form using the form name along with the variable.
form2.show
form2.k = 3
However, if you use a form variable to show an instance of the form, you must use that variable name to address the public variable. Two instances of the same form are displayed in the following example. The public variable k is assigned a value of 3 only in the first instance of the form, the one from form2.show. frm.k can be used to assign a value to the other form.
dim frm as new form2
form2.show
frm.show
form2.k = 3
Assuming only one instance of the form is shown in the application, is it reliable to address a public variable using the form name (form2.k), or is it better to show the form with a form variable and use that to refer to the instance of the form (frm.k)? Would the same answer apply to a property as well as a public variable?
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Apr 10, 2009
I am trying to do a really simple function (atleast it was simple in 6.0)... what I want to do is have two forms. One with a textbox, and one with a button and a textbox (we'll call this one form2). When I add a value to form2 and click the button I want the text to appear in form1's textbox.
My code in form2 is...
' on event button1_click...
form1.textbox1.text = me.textbox1.text
("me" being form2)
Anyways, how to pass a value from one form to another.
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