C# - .NET Events Special Methods (add/remove/raise/other)?
Dec 24, 2010
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?
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Dec 15, 2011
Normally I raise an event like this:
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
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Oct 27, 2009
I have form 1 which will raise an event for form2 after doing some calculations. I know how to raise an event in form2 and then write the sub in form1 but i cannot do the reverse... how can I do this in reverse??? I cannot raise the event sub in form2 is not responding.
Example:
Form1:
Code:
Public Class Form1
Event test()
RaiseEvent test()
[Code] .....
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Jun 23, 2009
I'm using a com object in my vb net application. I'd imported the com library and everything is fine.But the object does not raise events, None. I need to know if there is some way to achieve that it works.
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Oct 1, 2009
I am hoping there is a way to do this.I have a base class that has event handling in it. My console application is running my workflow. Part of that workflow is to raise events at specific intervals in a separate thread to broadcast the workers' current state (a heartbeat I have heard many call it).
I also have another program in the same solution that is a windows form that I want it to be able to listen to what is going on in the console application so that it can display the worker states. I have tried running both at the same time and verified the events are triggering, but the monitor is not finding any of the raised events.
I am fearing that there is no way to do this, and I will need to go to a database logging method or something else... but in the off chance someone knew how to communicate between applications with event (or event-style) logic, I would appreciate it.Currently the applications are running from the same location. The goal is that the monitor application will eventually be attached with a broadcaster for our network so that our workstations can monitor for certain worker states without being logged into the machine and the main monitor will show us the full status of all the workers.
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Aug 6, 2009
I'm trying to understand the concept of Raise Events and threading, From this tutorial i've just read in the author example he wrote that you need to use an event when calling sub when using threading, but he didnt elaborate enough in this subject, why can't I just call the function/sub as i always do?
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Apr 25, 2011
EF Navigation properties don't raise OnPropertyChanging and OnPropertyChanged Events.When looking into the entity framework auto-generated code a simple property will have a setter that looks like this:
Set
OnNameChanging(value)
ReportPropertyChanging("Name")[code]......
Seems like the navigation properties should call just call the 4 change notification methods. Do you have any insights on why the EF generater would be implemented in this manner? Is there an option somewhere to turn on notification or a work-around? Also, I assume that editing the designer generated code is bad practice, correct?
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Jan 25, 2010
i've a app that starts from a sub in a module, do a few things, and then load the form.
But it doesn't work :/
Here we execute dBase.AddTemporalFilepath
module.vb
Public dBase As New Core.clsDatabase
Public Sub Main()
FurBase.Directory = My.Application.Info.DirectoryPath
[Code].....
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May 26, 2009
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).
[Code]...
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Jun 21, 2012
Ok, so I'm writing a basic windows form application in VB.net as you do and need to be able to raise keyboard events based on data received from the serial port. I'm able to receive the characters that I want (lets say a lower case c) and display them. Its also easy enough for me to find the keycode. What I want to do though is tell windows that key "c" has been pressed. The application is paired to a bluetooth terminal, I wanted to have the experience of writing the code behind this myself rather than using another library although it seems I've failed already. How would I go about doing this?
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Aug 26, 2010
I am very confuse over a Raise Events example and using delegate as a function pointer: I am clear with this function pointer example program below which creates a generic sort function for sorting integer arrays without changing the main sort function.
' Returns True if need to swap
Delegate Function CompareFunc(ByVal x As Integer, _
ByVal y As Integer) _
As Boolean
Here are two alternative target methods for the delegate - one for an ascending sort and one for a descending sort:
Function SortAscending(ByVal x As Integer, ByVal y As Integer) As Boolean
If y < x Then
SortAscending = True
End If
End Function
Function SortDescending(ByVal x As Integer, _
ByVal y As Integer) As Boolean
[Code] .....
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Mar 15, 2009
I have a windows applications. Form 2 is child form of Form1 . Basically when button on form2 (child form) is clicked, it raise an events, which writes something in testbox on form1 (parent form). This is my code
parent form form1
Public Class Form1
Public mycount As Integer
[CODE]..............
This is the first time I am tring to use events.. I am not sure what's going wrong.. the textfill event is never called from form1.
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Jul 28, 2010
I've been thinking about my options when it comes to events in vb.net.What I'd like to do is to track events that are fired in an application without explicitly declaring them with 'handles' sub. Here is a pseudo-[code]....
Yeah I know, not quite working, but is there any way of implementing something like this in vb.net? My end game is really to be able to monitor events fired in many objects from another object, isn't there a more maintainable way to do that then to add a special sub in each object that handles the event that I want to catch? I need some way to let one object handle events fired in other objects without a special sub, the AddHandler goes a long way, but I can't really use that dynamically like so:[code]....
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Nov 20, 2010
Simple Question about .Net processing:
[code]...
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Mar 30, 2011
Problem that you may have when dealing with two objects that are raising some events. Here, to make it obvious, I am closing the form, but the problem can be experienced with any other 2 classes event. First, what is the problem !
Let suppose that by pressing a button, you want to raise a custom event, then execute a method and then close the form
In that case, you may use a code similar to this
Event BeepIt()
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
RaiseEvent BeepIt()
[CODE]...
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Feb 18, 2011
When i use my UserControl in a project my Mouse Enter & Leave events aren't firing, i assume i fix this with a raiseevents in my usercontrol. However when i try to do this it says something about "cannot raise base event from derived class".
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Apr 14, 2012
this would be my string Panipat,Patna,Result should be Panipat,Patna,Panipat,Patna,Result should be Panipat,Patna Panipat,Result should be Panipat,Panipat,,Result should be Panipat How can i do it
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Jun 8, 2012
I have a csv file and it has some special characters that blocking to insert data into a SQL server. How I can remove the characters before it dumps data into SQL.
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Jan 12, 2009
How to remove or replace all special characters(!@#$%^&*(){}[]""_+<>?/) from string in vb.net?
the example string is like like to## remove' all" special^& characters from string
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Nov 11, 2009
I'm redirecting a acronis cmd script to a text box, when its running it looks like this[code]...
im trying to capture the percentage so it can be used for a value in a progressbar. my question is how do i remove the (.)%# characters and where do i put the code i need? the update text box was needed to update the progress but without the Form3.status.Text = "" it made a new line with every percent increment
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May 27, 2011
Is there a build in function that removes the following without doing a replace for each character?
"NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL",
"BS", "HT", "LF", "VT", "FF", "CR", "SO", "SI",
"DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB",
"CAN", "EM", "SUB", "ESC", "FS", "GS", "RS", "US"
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Aug 13, 2010
(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).
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Aug 5, 2010
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?
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Mar 6, 2012
If I have an application that load some assembly at runtime. Is it possible to access the events and the methods of these assemblies direcly, without always using Reflection
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Jun 13, 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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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 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.
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Feb 17, 2012
I created a Class that inherits List(Of TKey, TValue) and adds a few functions. Its purpose is not to add items to it at runtime, but when it is initialized. I would actually like to remove the add/delete methods from the class (as it currently exposes them from the inherited class).
[Code]...
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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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Aug 5, 2009
I am trying to remove the "System" or "Default" events in a vb .net custom control. i dont want them to appear in the list once added to the form. [code]...
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