Calling Methods In Forms From Embedded User Control Class?
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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Jan 25, 2010
I have the following class in a .NET class library:
Code:
Public Class JasonTest
Sub New()
End Sub
[Code]....
The .AddNumbers call works fine, but the AddStrings call yields the error 'Object doesn't support this property or method'.
Is there any way to call a shared method from .NET in VB6? I was unable to find any documentation on this.
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Apr 11, 2009
how can i call a VB function - deleteevent() in usercontrol.ascx.vb from a javascript function in clickhandler(e) in usercontrol.ascx. The call should cause a postback because I need the usercontrol to display the changes.I am currently trying to do it by using a linkbutton with style display:none, and calling its click event from the javascript function. But i dunno how to call the click event.
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May 13, 2011
Example:
Two files - TestClass.vb, myForm.vb
TestClass.vb looks as follows:
Imports System.Threading
Public Class TestClass
Private myClassThread As New Thread(AddressOf StartMyClassThread)
[code]....
The result:Application runs, no errors or exceptions.Displayed is the listbox and the Start button.I press the start button and a msgbox says "Not Invoked" as expected and upon clicking OK to that msgbox "Start Button Pressed" is added to the Output listbox control.Immediately following that the msgbox pops up again and says "Not Invoked". I was expecting "Invoked" as a separate thread is trying to use the Output listbox control.Of course this results in the Output.Items.Add being attempted which results in no visible result as the thread is not allowed to directly update the UI control.
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Mar 29, 2012
i have a user control that contains a button. I want to Over ride a custom function on click of that button like
Protected Sub btnUploadSpreadSheet_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUploadSpreadSheet.Click
MyMethod()
End Sub[code].....
and in my page where i have added my control when i tried to over ride
Protected Overrides Sub MyMethod ()
End Sub
It is not finding that sub in the base class.
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Nov 26, 2009
XP WEBBROWSER-CONTROL: brings up PDF embedded in webbrowser control, as desired.XP IE7: Behaves the same if you manually navigate to URL, as desired.VISTA WEBBROWSER-CONTROL: brings up PDF by separately launching Acrobat, won't embed in webbrowser control. Not desired.Vista IE7: embeds PDF properly if you navigate to same URL, as desired.I am using Acrobat 9, where there is a preference setting under Internet to bring up PDF embedded in browser -- works fine directly in IE7, but not in webbrowser control.
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Nov 21, 2009
The project requires a form that has textboxes for a students name and the amount of books they have read, and a label where the points they have earned for their reading is displayed. Also a seperate form with About information and yet another seperate form for summary information.
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Apr 11, 2012
I was looking for a tutorial and i find this
[URL]
but it does not give the sample code for creating a user control with properties, events, methods
complete to create windows user control? that includes creating properties, events, methods? and if it has how to create web user controls better
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May 15, 2012
When inheriting class or control e.g. ListView, TreeView, etc..., what is the best way to distinguish between built-in methods/property/events and mine?
Currently, i start my methods/property/events with "aa" in order to make them at the top of auto complete list.
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May 30, 2009
I have a panel2 inside a split container that has several user controls loaded into it. Panel 1 has an exit button and I want to call one of the sub routines that is in one of the user controls loaded into Panel2.
Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
Dim dialogMessage As DialogResult
Dim a As New ucTimeTracker[code]......
This line is giving me trouble "ucTimeTracker.autoWriteFileOnExit()"
I am getting (reference to non-shared member requires an object reference).Basically I want the exit button on frmMain. SplitContainer. Panel1 to call autoWriteFileOnExit() on the user control named ucTimeTracker that is loaded into splitContainer.Panel2
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Jan 28, 2009
I have this application which has one class. I need to return a recordset of data to the calling form. If i use Properties to return, it can only return only a single value at a time. Right now i'm returning a datareader object with one of the properties.Can anyone suggest a better way to return multiple rows of data to the calling method via Class Property?
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Mar 29, 2010
I am not sure how clear my question is by the title, but I am trying to make Class methods instead of Instance methods in Visual Basic that way I don't have to waste memory and code creating temporary objects to execute methods that don't need instance variables.
I am not sure if you can do that in VB but I know you can in Objective-C by using either a "+" or "-" sign in front of the method declaration. And in C++ (at least I think, I can't remember) you put the static keyword or const keyword in front of the function.How would I do this in VB if it is possible? Or should I just make a separate set of functions that are not members of a class?
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Apr 7, 2010
i'm trying to learn about user controls. I created a user control that has a textbox and a button. What i'd like to be able to do is when i click the button in the user control, populate a label in the aspx page. I understand that i could just have a button on the page that uses some properties on the user control to get that information.. but i'd like to know how to do it with the button the user control.. the reason for this is the button is just an example.. a learning tool. if i can get this working, i'd likely be putting thing in the user control that might require this kind of passing information. Anyway.. i've found some c# examples that i tried to get working as vb.. but once started getting into the delegates and events..
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Apr 13, 2009
how can i call a VB function - deleteevent() in usercontrol.ascx.vb from a javascript function in clickhandler(e) in usercontrol.ascx. The call should cause a postback because i need the usercontrol to display the changes. i am currently trying to do it by using a linkbutton with style display:none, and calling its click event from the javascript function. But i dunno how to call the click event.
[Code]...
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Jul 3, 2009
I'm writing a console application in Visual Basic 2008 Express. I added several text files to my project as resources. Specifically... I went to my project's "Properties" page and selected the "Resources" tab. I clicked the "Add Resource" dropdown and chose "Add New Text File". I entered some simple text and saved the file as "Welcome.txt". I built the entire solution.n my code, I use console.writeline(My.Resources.Welcome) to display the text
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Feb 12, 2009
I Need Build a user control which works as a Login control using Windows Class Library or Component Template:The user control returns the user name and the password It means that the control has minimum two ReadOnly Property procedures. You let the user of your control (he/she which uses your control in his/her software) to set the background colour of the two labels. Create a Windows application to test your control.
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Feb 28, 2011
I tried it and get an error but maybe I'm tring the wrong way. Can a usercontrol inherate an application defined class ie.. could you inheritance a classic rect class into a user control to add the hight and width properties to the control without having to do all the coding all over again? Currently I just declair a private instance of the class within the control and then encapsalate. It would be nice if I could just inherit all the functionality of my classes into controls designed to implament the classes.
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Jun 26, 2009
I have a tab control on first page of which there is a flexgrid. some functions are called which throughout make chages to this flexgrid. now during runtime I create more tabpages with exactly the same Flexgrid (as in I have named it the same as the first one so that I should be able to call the same functions and the same modifications should happen with this flexgrid as well. How should I call the function so that the flexgrid used is the one on my new tabpage. if I just call the function with the code Call functionname(), it modifies the same flexgrid control in the first tabpage and does nothing to the new ones on the newly created tabpages
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Apr 19, 2009
I've been wasting so much time on this. Basically I want to have a list of objects and I want to call some specific methods of some specific bjects..g.MsgBox(Instances(0).Position(0).ToString)It should alert a number that presents the X position, but it is not working... the box does not even appear and no errors.
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Mar 30, 2012
It's been a while since I've had the time to browse through here, answer questions and ask some of my own. Just got a job at a custom business software developing company! But I do have a question I'd like some clearing up on.
What I have here is 2 classes, one inherits the other. Both function similar so a lot of the methods are the same for each. The one in particular is Reset_Class()
Here is a sample code of what I'm trying to do.. My question is, is it correct?
vbnet
Public Class Form1
Private Sub Button1_Click( ByVal sender As System.Object, ByVal e As
[Code].....
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Apr 7, 2009
In C# I'm calling a function on an interop class (Connection, written in VB6), which itself returns a plain object (System). Then there's a function on that object (InitialiseData) that I also call (even though the compiler isn't aware of it). var isInitialised = Connection.System.InitialiseData(path); The problem is, because that System object is returning a mere Object, I get the compile error "cannot resolve symbol". I can see why, but the same thing works fine in VB.NET:
[Code]...
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Aug 8, 2011
I have a form (frmMain) that contains a custom control (con class). frmMain contains a combo box control and when the user selects a value from it, I pass this value to a sub routine within con class (see red line below). This purpose of the sub routine is to populate a set of comboxes contained in con class according to the value that is passed in.
Private Sub cboGuidelines_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboGuidelines.SelectedIndexChanged
If bChanged = True Then
[code].....
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Sep 29, 2010
control that contains a button. the user control is placed on my main form. when the button on the user control is clicked I need to to call a method that is located in the mainform.vb
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Aug 9, 2009
control that contains a button. the user control is placed on my main form. when the button on the user control is clicked I need to to call a method that is located in the
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Dec 26, 2011
I want to use reflection to dynamically call a dll (not an assembly, non-managed, possibly COM object model) in vb.net.I've seen several different methods of calling a method in a dll that is a .net assembly - but I have not found the way to dynamically call a method inside of a dll like user32.dll or winmm.dll. I believe this would be called late-binding?
The reason I'm asking is because I am building a language that will depend on external libraries for lots of different functionality. An example (in this language I'm building):
Declare Function mciSendStringA using "winmm.dll" (strCommand As String, strReturn As String, returnLength As Integer, blah As Integer) As Integer
Declare Function WriteConsoleA using "kernel32.dll" (hConsoleOutput As Integer, lpBuffer As String, numberofcharstowrite as Integer, lpReserved as Integer) As Boolean
When I build the interpreter for the call to mciSendString in winmm.dll, how can I use reflection to handle this? I want the user to be able to reference any dll/method they wish.Can I get some guidance in the right direction? Perhaps even some vb.net code that I can take apart and understand?
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Jan 19, 2011
i have a usercontrol named filebox (which wraps a fileupload and some related stuff)
in a certain .net class i have need to use this type as a ctype
but i cant seem to call ctype(aobject,filebox)
or either ctype(aobject,Controls_filebox) (which is the correct name)
how can i convert an object to this type?
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Nov 8, 2010
I'm building a UserControl which will be used by other developers.
If I build the UserControl for "AnyCPU" will there be any problems if another developer uses my UC in an application which he builds for x86.
I mean if the complete application is running on a 32 bit machine then all should be OK but if the app is running on a 64bit machine then the x86 app will run on wow64 but where does my UC run ? In native 64bit or does it default to the same as the parent ?
Or do I have to make x86 and x64 versions of my UC ?
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May 21, 2009
I have a base page class that inherits from Page. We'll call it SpiffyPage. I also have a user control called SpiffyControl. I then have an aspx page, ViewSpiffyStuff.aspx, that inherits from SpiffyPage. On page load, the SpiffyPage class is supposed to inject a SpiffyControl into the aspx page. The problem is that SpiffyControl is a user control, and to instantiate that in the code behind one has to access the ASP namespace, sort of like: ASP.controls_spiffycontrol_aspx MyControl;
But SpiffyPage isn't an aspx page, it's just a base page, and as such I can't access the ASP namespace, and I therefore can't instantiate a SpiffyControl in order to inject it. How can I achieve my goal?
Edit: One important point is that I must have a reference to the actual control type so I can assign values to certain custom Properties. That's why a function like LoadControl, which returns type Control, won't work in this case.
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Jun 3, 2010
I use the same nemespace in both user controls. I create a class in one of them and I want to be able to call it from another class but it is not visible. It is public.I specify full namespace and can not see it. How do I do that?
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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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