Use Control.CheckForIllegalCrossThreadCalls = False And Bypass The Delegate?
Dec 9, 2011
So I have a custom control that basically acts like a listview, but it draws everything out and finds where the mouse is and all that.But when I have another class that goes in a chatroom and receives data, then raises an event to the parent (which is the main form), I then pass it through a delegate and then it adds to the custom control.This seems to take a lot longer to add items to the list than If I just use
Control.CheckForIllegalCrossThreadCalls = False and bypass the delegate?What should I do.
[code]...
Is there a faster way to pass all the info, or should I just bypass the cross thread check and not use a delegate?
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Apr 26, 2012
Control.CheckForIllegalCrossThreadCalls = False
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Apr 4, 2009
Is there any cause that this property's value isn't false by default?. When you work with threads, you always require to update user interface from the child thread, I think that may be false is not the default value because of its side effects, wich I don't know.
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Jan 30, 2010
from the documentation we have this: Multicast Delegate: Represents a multicast delegate; that is, a delegate that can have more than one element in its invocation list.
so am i right to say that Multicast delegate is no different from a normal delegate other than the fact that it has arguments. so System.Action is a 'normal' delegate whereas System.Action(T)(Byval obj as T) is a multicast delegate?
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Oct 1, 2009
I'm working with the DevExpress XtraGrid control.I have a routine that goes thru and adds all the controls on the current form dynamically, and launches on a seperate thread the routine for a given control to initialize it to the value that will be displayed to the end-user. Some of the controls are displaying calculated values, and take some time to return their values, so that's why we are doing it on a seperate thread.
[Code]...
I'm using a similar snippet of code for any control properties that have to be updated, and all work fine. On the above code when the actual Invoke is called, it APPEARS that the thread just ends and never calls the delegate, and doesn't return to finish either.
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Feb 9, 2010
I've created a Delegate that I intend to call Async.
[Code]...
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Jun 1, 2010
Code:
Public Class SendPings
Shared Sub New()
AddHandler Post.Saved, AddressOf Post_Saved[code].....
I get a error" Method 'Private Shared Sub Ping(item As BlogEngine.Core.IPublishable, itemUrl As System.Uri)' does not have a signature compatible with delegate 'Delegate Sub WaitCallback(state As Object)'.
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Jun 27, 2011
I have a (legacy) form where I had to add the InvokeRequired/BeginInvoke(Delegate) to avoid the "Control control name accessed from a thread other than the thread it was created on." exception.This seems to work fine but there are some scenarios where the BeginInvoke is not calling the Delegate (which I can tell from the output log). [code]
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Aug 11, 2011
I know how to turn a control's visible property to true or false, the only thing I don't know is: If I have, for instance, 40 group boxes in which only one is visible, when I click on a button, the first group box visible = false and the second group box visible = true, and when I click on it again, the second group box visible = false and the third group box visible = true, and so on I don't want to write the codes for every controls, since it will be quite time consuming, I want to use fewer codes to achieve this objective,
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Mar 23, 2010
I am trying to write a VB.NET alternative to a C# anonymous function.I wish to call Threading.SynchronizationContext.Current.Send which expects a delegate of type Threading.SendOrPostCallback to be passed to it. The background is here, but because I wish to both pass in a string to MessageBox.Show and also capture the DialogResult I need to define another delegate within. I am struggling with the VB.NET syntax, both from the traditional delegate style, and lambda functions.My go at the traditional syntax is below, but I have gut feeling it should be much simpler than this:
Private Sub CollectMesssageBoxResultFromUserAsDelegate(ByVal messageToShow As String, ByRef wasCanceled As Boolean)
wasCanceled = False
[code].....
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Apr 6, 2009
Well im working agains a webservice that has a certificate that is not 100% correctly setup the certificate is setup for the domain [URL] and the api is located at [URL] now i cant connect to this webservice as i then get a WebException "Could Not establish trush relationship for the SSL/TLS secure channel. The remote certificate is invalid according to the validation procedure. Now my question is there any way to bypass this check i use a normal Web Reference (2.0) not a Service Reference..
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Mar 29, 2011
how would i bypass the loader lock. I know there is a way to disable it but im not sure how
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May 30, 2011
There are keyloggers everywhere - for bank accounts, gaming accounts and etcetera. Low level keyboard hooks seem to be unable to bypass - and that would be dangerous. How would I try to ignore these keyboard hooks? Would sendkeys work? Or is there simply no way to do that?
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Apr 1, 2010
VB GridView control will not allow code in the vb code file to access a data column that has its visible property set to false. When it is set to true, the data column can be accessed with no problem. Any suggestions as to how to correct this? I have looked through the documentation, text books, and I have not found anything that gave me any clue as to what the problem could be. I thought that the property was just applied to the column, not that it would remove the column from being accessible.
[Code]...
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Mar 27, 2009
i have been making an application that uploads files to an FTP server, what i wanna know is if it runs it to a problem how can i make it bypass that for example.
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Jan 30, 2009
I'm programming something and I have it set to where if you leave the text box blank then a message box comes up and tells you to enter a value to move on to the next text box [code]Now whats currently happening is if I click the exit button and leave the name text box blank the error i programmed will come up and tell me to enter a name. I want to be able to click the exit button while no text is entered in the name text box bypassing the error message.
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Jan 18, 2010
My datagridview has four column while press tab, i want to column2 not to get focus.
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Jul 13, 2010
Is there anyway to disable the vb.net (2008) express popup for converting older projects as well as the security warning to browse the project? I'm fairly new to vb.net so of course I download lots of examples to learn off of and it is BEYOND annoying to have to convert every demo and then click ok to browse the code.
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Oct 14, 2010
VB6 application MDI-Child architecture. Closing event is handled via QueryUnload event in both MDI and child form. Order of event trigger is MDI form closing(QueryUnload) event fires first followed by child form closing event(QueryUnload, I would like to call it as FormClosing itself as it is more comfortable and correct)Now after migration, order of event trigger is occuring in reverse. Child form closing event is firing first followed by MDI form closing event. We want to reverse the event triggering badly because of the logic written inside the closing events. Swapping the logic inside the events is not a viable option considering the huge changes we need to make (we have 31 vbprojects with 31 MDI forms and numerous child forms).
How I can make the MDI's closing event to be triggered first before child's closing event?
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Jan 31, 2009
I have a validating event for a txtbox called txtname. If the user tries to leave txtname for another txt box without entering their name a messagebox comes up giving an error. I have an exit button which will when clicked ask you if you really want to leave then you can choose yes or no. I can't seem to figure out how to allow the user to click the exit button while leaving the txtname blank so it would bypass the error message and only bring up the exit prompt. Here's what I have coded for the validating event and the exit event.
Private Sub txtName_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtName.Validating
If IsNumeric(txtName.Text) Then
[Code].....
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Aug 2, 2011
I also set certain commandline prompts for another that I named DebugWithoutLogon. The app is then set up to bypass logon and set certain test flags so during debugging I don't have to login and do those things every time.
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Dec 23, 2009
I wanted to load a lot of items into the listbox and found out its limitation i.e I try to load 1000 lines of long words, it hit to the max. So my questions: Is it possible to bypass the max size limitation or is there other control that can handle better than listbox?
[Code]....
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Jun 6, 2012
"how to do anti-bypass firewall using Service"
some way bypass the firewall, such as using : software Ultrasulf , Proxy-Server , Web-Proxy
In this case , i will anti-bypass firewall on Proxy-Server and Web-Proxy , i will write a services in window
I think it as same : First , capture package with IP-Address , then request from proxy-server . Second ,very importanly , in here , we compare with IP-Add is truth , if IP-Add not truth , at list Block IP-Add , else accept to request to website
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Dec 17, 2009
i am currently using this code to delete folder files.
For Each itm As String In ListBox1.Items
Try
My.Computer.FileSystem.DeleteFile _
[Code]....
what i am having problems with is that if a file is in use, i get a msgbox prompt.. i do not mind it not deleting the file. how can i bypass that msbox to not show??-.trujade.-
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Mar 13, 2011
I run a query on Access and although it warns me about null fields, it can still run the query and add the rows.However, when I run through JET in VB.NET, it says "Data type mismatch in criteria expression".Is there a way for JET to behave like Access (ie. still run the query and add the rows)?
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Jan 31, 2009
I have a validating event for a txtbox called txtname. If the user tries to leave txtname for another txt box without entering their name a messagebox comes up giving an error. I have an exit button which will when clicked ask you if you really want to leave then you can choose yes or no. I can't seem to figure out how to allow the user to click the exit button while leaving the txtname blank so it would bypass the error message and only bring up the exit prompt. Here's what I have coded for the validating event and the exit event.
Private Sub txtName_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtName.Validating
If IsNumeric(txtName.Text) Then
[Code]....
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Dec 28, 2010
I tried installing my app in another computer and found out that a lot of error messages keep popping up. What can i do to bypass these error messages? something about jit debugger or sumthing. Can i compile the app in such a way that these errors wont pop up?
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Jun 3, 2011
In my form there is a "Validating" event on a textbox.
This form also has a "Cancel" button.
Is there a way to not execute the "Validating" event when the user clicks on the "Cancel" button?
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Apr 22, 2009
While reading this threadthe code sample there came from MSDN, which was used to demonstrate the use of a delegate. I know what Delegates are. And I know how they work when it comes to things like crossing threads and even sinks.... how ever, the sample given is a simplecontrived example, and I'm wondering why/when would I use a delegate in this situation? Or in any situation? In my head, it seems it would have been easier/cleaner to call the function pointed to directly...
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Feb 11, 2010
I heard once that .net introduced an already defined delegate with no parameter that we could use instead of creating one.
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