Limit The Default Events, Properties And Methods Exposed From A UserControl?
May 11, 2010
limit the default events, properties and methods exposed from a UserControl so it only displays to the developer the new events etc that I code myself.What i mean is I have created a UserControl with a panel and 5 buttons, written 1 Public Eventonly at this stage, I have placed an instance of the control on a form in a new project, but in the drop down menu that comes up after say (myUserControl1.), there is a massive list of options, I don't want those to appear.
Is there any simple way to hide all the design time properties of a User Control.
When my UC is on a form there's a lot of properties in the properties explorer. All those default ones that every UC has. AccessibleName, AccessibleRole, Anchor etc etc etc (dozens of the them)
Any way to hide most/all those and just expose my own ?
I suppose I want my User Control to be more like a 'Component' like the Timer and other components that don't have a UI. Short of rewriting my UC as a Component is there any quick way to hide all those form properties ?
I'm trying to write a wrapper to a service, which will be used by an existing VB6 project. I've got most of the basic framework working, except for one important aspect: I can reference the wrapper in a VB6 project and subs/function calls etc. work as expected, but events do not. The events are visible in the VB6 app, but they never fire.
VB.NET Code:
Public Event Action_Response(ByVal Status as String) Public Function TestEvent() RaiseEvent Action_Response("Test Done")
[Code]....
So, the cmdTest button code prints 'Done' as expected, but the Action_Response event doesn't fire. Is there something else do I need to do to get the event to fire?
I have a WPF Keyboard Application, it is developed in such a way that an application could call it and modify its properties to adapt the Keyboard to do what it needs to. Right now I have a file *.Keys.Set which tells the application (on open) to style itself according to that new style. I know this file could be passed as a command line argument into the application. [code]...
I have a Windows Form frmMain() holding seven more-or-less unrelated UserControls, ucFlopsy", "ucMopsy", "ucCottontail", etc...I say "more-or-less" because each of the seven UC has three similar public read/write properties:
IsLocked (a boolean indicating if the following two properties are "Locked") IsLockedID (if IsLocked=True then IsLockedID is an integer) IsLockedName (if IsLocked=True then IsLockedName is a string)
I am making an UserControl which has several properties. One of them should have a specific range of the value - it should only be possible to set the value of the property with a number from 1 to 255. 0 should not be possible, because some calculations are done in which is divided by this property's value. I thought I could use a Byte as type, but a Byte can contain 0 as well. I would like to be able to set a limit for the value of this property, and that an error is shown in the Designer when, in this case, 0 is entered. I mean an error window like you get when filling in 0 for the interval of a Timer. Is this possible with an UserControl as well?
I have a usercontrol that has a main form and calls another form within the usercontrol to get some data from a database that allows the user to select some items from a CheckedListBox control on the sub form. I want to pass the selected items from the CheckedListBox back to the main form and display the results there. I have a public property called DBList of type List(of String) on the main user control. If I create a reference to the usercontrol form the second form within the usercontrol I get a new instance of a user control. All I want to do is set the property on the usercontrol and close the secondary form. How do I reference the usercontrol from the form within the usercontrol?
Code in UserControl:
Public Property DBItems() As List(Of String) Get Return DBItems
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
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
I am working on an application that has a number of forms in it, doing asynchronous comms with a "radio network" over a serial port.To handle replies from the network in the appropriate form, I am using RaiseEvent. As time goes on, I seem to be needing more and more events. Is there a limit to the number of events that can be firing off at the same time?
I understand that computers can't actually do several things simultaneously, but obviously while the code triggered by one event is still running, another one might fire.
When I look on the Internet I find many want to know how to get MouseWheel events with a UserControl.I'm getting scrolling with the mouse wheel and don't know why.It doesn't seem to be the default since I have other usercontrols that do not respond the the mouse wheel.In one UserControll I find if I move the mose wheel the contents moves. Actully moves too much for good viewing.I've searched the code for "Wheel" - no hits. Also for e.Delts - no hits. Finally I tried:
[code]...
Commented out as shown I do not get the unwanted mouse moves.If I remove the apostrophe I do get them.
Questions:
Is it OK to not call the Base sub in some cases?How do I find out if it is OK? (For example I don't imagine you'd want to not call it in New()Secondly and most important, What is going on? Why and I getting scrolling with the wheel in a Usercontrol and not getting it in other UserControls?
I am trying to develop a control that'll allow the developer to populate a collection through markup (e.g. Properties decorated with the attribute PersistenceMode(PersistenceMode.InnerProperty). I have an example from Brian Chavez that more or less does what I want but I want to have the control inherit from UserControl and not Control.Here is the code I have in vb.net:
AggregateFeeds.ascx.vb Imports Microsoft.VisualBasic <ParseChildren(True)> <PersistChildren(False)> Public Class AggregateFeeds
[Code]...
As it is now when I try to compile I get a compiler error that simply says object instance not set to an instance of an object on the line above. If I take it out, the page loads just fine and the Settings object reflects the values in the markup. Why am I having trouble getting the collection to populate correctly?
I would like some code to execute at the "preload" stage of my usercontrol's lifecycle. However the preload event is only available on the Page object. So, I added the following method to my usercontrol: Private Sub Page_PreLoad(ByVal sender As Object, ByVal e As System.EventArgs) Handles Page.PreLoad
However, I know get the compile error: "Handles clause requires a WithEvents variable defined in the containing type or one of its base types". As the Page property is inherited from UserControl I don't see how this can easily be done.
I have a winform with a wpf usercontrol on it (ElementHost1). The usercontrol contains only a button. How can I know when the wpf button has been clicked in my winform? How can I "redirect" the events from wpf usercontrol to winform?
A form's key events will fire when you press a key. Place a control on that form and it won't happen any more because that control has focus. There are exceptions to this however as you will see if you place just a h or v scrollbar on the form. The key event will fire because the scrollbars can't receive focus as is demonstrated by the following
Private Sub ScrollBar1_GotFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles VScrollBar1.GotFocus Debug.Print("Scroll GF") End Sub
[code]....
So I've made my own special scrollbar usercontrol and i can't figure out how to have it leave the key events alone. I'm pretty sure that the problem is that my usercontrol can receive focus at the moment.
I found that the way of doing this is "SetStyle(Windows.Forms.ControlStyles.Selectable, False)". I put that in the new event of my usercontrol and now it looks like this:
Public Sub New() ' This call is required by the designer. InitializeComponent()
I'm trying to create a UserControl in ASP.NET to display news items based on two values that are passed in, NewsTag and ItemLimit. The problem is that the SQLdatasource is not picking up the properties in SqlDataSource1_Init. Instead the calls to the properties are empty when this is called but after render have values.
<script runat="server"> Public Property NewsTag() As String Get
i've created a usercontrol in a win forms project + the properties work as expected, but when i recreated my usercontrol as a win forms usercontrol class library, the properties changed at runtime aren't persistent.i tried adding a DesignerSerializationVisibility attribute to the property but that didn't work.
I've been scouring the Net, but I can't find anything really useful on how to set a default button in a user control (everythings for ASP). I can imagine the brute force method of handling the keypress for each control within the control and checking to see if the Enter key was pressed, and if so, calling a PerformClick on my desired button... But I just have difficulty imagining that this will be the best method, especially on Search Controls that have 30-40 subControls on them. I've tried just handling the KeyPress event at the control level but it never gets called when a sub control has focus.
Another problem with the brute force method is that some of the controls within my UserControls are themselves UserControls containing several controls, so I would have to handle each sub control within the sub-user-controls and create EnterKeyPressed events that were raised when one of the sub-sub-controls received an Enter KeyPress. This could go on for several levels. Then I would need to handle all these events. This seems like an unnecessary layer of complexity.
Is there some way to create a routine that perhaps automates the above? Or just a simple workaround? I know I can set the Accept and Cancel Buttons of a form, but I have a form with a TabControl that has a UserControl on each tab. Each one of these tabs needs its own Default Button.
I was wondering about the EventInfo.GetRaiseMethod and EventInfo.GetOtherMethods methods. Apparently, the CLR supports 4 kinds of methods associated with events: add, remove, raise, and "others". But events created in C# only have add and remove... I assumed that raise was used in VB, since you have to specify a RaiseEvent method when you declare a custom event, but apparently it's not the case: GetRaiseMethod always returns null.what's the point in having a raise method associated with an event if it's never used? Is there a specific MSIL instruction to raise an event using this method? (I couln't find anything like it in the opcodes)what are the "other" methods returned (well, not returned actually) by GetOtherMethods? What's are they supposed to do?are there types in the BCL that implement those special methods?
(using VB.Net 2008) I have some modules in my program that I want to change to shared classes. This is due to subtle differences between shared classes and modules, such as how modules cannot be nested (I think). Of course, there is no such thing as a "shared class" in vb, rather just sharing every single sub, event, etc. So that means if I want to share or unshare a class, I must change the "Shared" part of the signature of every single method inside the class (of which there could be dozens or even hundreds). Is there an automated way to do this? Really think VB made a mistake by not simply declaring a class as "shared" (or just make modules completely identical to shared classes).
Whenever we need to handle events, we do it by creating a method which handles the event. Without creating methods; is there some other ways of handling events?
I am trying to dynamically create COM object, call COM method and set COM properties. The COM class is a VB6 ActiveX DLL. The implementation is exactly equal to the VB6 code from this page
I've created a VB.Net ClassLibrary with a UserControl in it. I can load it from an HTML page and call the methods that I created. This works as expected. I've tried several examples for how to raise an event from the VB code to the js caller, and none of them seem to work (I'm using IE7).
I must have done something really, really dumb somewhere, but I don't know if I did a really, really dumb VB.Net thing or a really, really dumb Framework thing.I have a dirt simple UserControl - it consists of one Button. Nothing more.
