Show ToolTip On Background Thread?
Mar 2, 2010I am running sum of my code in a background worker and I need to show sum tooltip text on a label, but nothing shows up.[code]...
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Forms :: Background Thread Doesn't Show Progress?
Mar 15, 2010I was looking for a solution to run a lengthy job (looking for files on the fixed drives) withouth freezing the UI, and saw that using a BackGroundWorker control is the recommended solution.
Problem is, I don't see its ProgressChange event being triggered:
Imports System.IO Imports System.Text.RegularExpressions
Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Button1.Enabled = False
[Code]...
Call A Method That Started On A Background Thread On The UI Thread Calling BeginInvoke And Passing In A Delegate?
Aug 27, 2011I am trying to call a method that started on a background thread on the UI thread calling BeginInvoke and passing in a delegate as follows:
Dispatcher.BeginInvoke(Function() UpdateApplicationDataUI())
to call this method:
Private Sub UpdateApplicationDataUI()
...
End Sub
However, I get an error in the call to BeginInvoke (the UpdateApplicationDataUI portion of the delegate is stating "Expression does not produce a value").
Me.Dispatcher.BeginInvoke(Function() New Action(AddressOf UpdateApplicationDataUI))
Function Returns UI Thread Value To Background Thread?
Dec 4, 2008A non-UI thread in my prog needs to obtain data from a UI listview control. To prevent cross-thread errors I use the following, but it freezes the prog (probably because the "Else" part is never called).What am I doing wrong?
[Code]...
Show Balloon Tooltip From Another Form?
Jun 13, 2010I want to display a balloon tooltip in the system tray. Currently, my app has four forms. the main form host the notifyicon. In process of operation with other forms, i want the current form to be hidden , and display a balloon message using the notifyicon of the main form.
in the form about to close this is what i did
c# Code:
frmMain frm2 = new frmMain();
frm2.ShowBallon("Logged in","Check for new mail....");
this.Close();
[Code].....
The problem is that the procedure executes, but dosen't show any balloon .Another problem is that the notify icon does not disapper automatically when the app exits, except you hover the mopuse over it.
Show Tooltip On ListView Item?
Jun 23, 2009I have added three images to ImageList..I want to show tooltip....On listview item...
Public Class Form2
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code].....
Mine code is working fine..But probs is that..as i hover the mouse suppose over the first image tooltip is shown..Now when i hover the mouse on second image..first image tooltip is still there..I want first tooltip to be disappeared..
Extend Duration Show Time For Tooltip?
Jul 28, 2011The maximum value that works for AutoPopDelay property of ToolTip is 30 seconds (30000 milliseconds). Any values greater than this maximum will be defaulted to 5 seconds (5000 milliseconds).[url]...
How to set to extend the duration show time for ToolTip? or alway show until the mouse leave the control?
Forms :: Show Tooltip For Disabled Control?
Mar 1, 2010I have this flexgrid which shows a different tooltip for every cell it contains. Now I would like to see this exact same tooltip for every cell when I put the flexgrid on enabled = false but I can't find a way to do this.
View 4 RepliesForms :: Show Tooltip In Notification From Backgroundworker?
Mar 4, 2009I have a procedure that download a file in a background worker how can i show a tooltip in a notifyicon when the background worker have finished the work ?
Can i implement also a progressbar from the backgroundworker ?
Make A Little Class To Show The Balloon Tooltip?
Apr 28, 2012I am trying to make a little class to show the balloon tooltip at the moment I got eveything I want working but have no idea how to set the forecolor of text and backcolor.
here the code I am using to show the tip, I added backcolor and forecolor but nothing seems to happen, I am also using Visual Express 2010 if that makes any difference.
vbnet
Public Sub ShowTip(ByVal obj As Control)
Dim tp As New ToolTip()
[Code]......
Show Image In Datagridview Cell Tooltip?
Oct 15, 2011I'm aware that the tooltip object can contain an image. I am unable to make an image popup when the mouse hovers over a datagridview cell, since it is not possible to attach a tooltip object to a cell ( myTip.SetToolTip(gridCell, "Hello") generates a compile error)
View 4 RepliesShow Tooltip When Datagridview Cell Is Selected?
Jul 20, 2011How can you show the tooltip for datagridview when cell is selected, not from mouseover but from using the arrow keys?
View 2 RepliesVS 2005 : Show Tooltip On ListView Item?
Jun 23, 2009I have added three images to ImageList..I want to show tooltip....On listview item...
Public Class Form2
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ListView1.View = View.LargeIcon
[code]....
Mine code is working fine..But probs is that..as i hover the mouse suppose over the first image tooltip is shown..Now when i hover the mouse on second image..first image tooltip is still there..I want first tooltip to be disappeared...How to do that..
Show Tooltip When User Editing Cell In DataGridView
Nov 23, 2009I am trying to trigger a tool tip when a user enters a cell in a DataGridView and starts editing it. The idea being that I want the user to know to hit the Return key after they are finished typing in a string in the cell. I only want the tool tip to show when the user is editing a cell in columindex 1.
The following below does note seem to be working.
Private Sub dataGridView14_CellEnter(ByVal sender As Object, _
ByVal e As DataGridViewCellEventArgs) _
Handles DataGridView14.CellEnter
'Only care about columnIndex 1
If e.ColumnIndex = 1 Then
[Code] .....
Visual Studio 2008 - Show Alert Using Tooltip
Mar 24, 2011I have a small application in which I need to show alerts if a particular condition is met. I have an mdi form and several child forms. Now the best way to show an alert is to show a tooltip on the right side corner of my mdi form. Though this works, but the problem is I want user to close the tooltip once he has read. Now the tooltip that vb.net provide does not support click events. If I give a long time duration the tooltip would be open all the time and if I give a short duration then it will close quickly. What can I do ?
View 1 RepliesForms :: DomainUpDown Class - Mouse Event To Show Tooltip?
Jun 10, 2011Currently have created/extended the DomainUpDown class hoping I would be able to add one simple feature: I was hoping to be able to show a tooltip when the user mouses over the control that would show the next and previous item in the list. However the DomainUpDown class does not have a mouseenter event and overriding the mouseenter method does not seem functional. Is there something I am missing or do I just need to create my own MouseEnter event?
Private tips As New ToolTip With {.AutomaticDelay = 0, .AutoPopDelay = 0, .InitialDelay = 0, .ShowAlways = True, .ForeColor = Color.WhiteSmoke, .BackColor = Color.Black}
Protected Overrides Sub OnMouseEnter(ByVal e As System.EventArgs)
MyBase.OnMouseEnter(e)
Console.WriteLine("list entered") 'testing purposes, never is printed on mouse enter
tips.SetToolTip(Me, "Up = " & Me.Items(Me.SelectedIndex - 1).ToString & vbLf & "Down = " & Me.Items(Me.SelectedIndex + 1).ToString)
End Sub
Show A Tooltip Over Each Item And Displays Fine - Can't Replicate For A Button?
Jan 18, 2010I have a listview where I can show a tooltip over each item and displays fine.However, I can't replicate for a Button.
Private Sub AddListview()
Dim lView As ListView = New ListView
'enable it[code]....
I have tried all different variations, but nothing really seems to work. The tooltip flickers on the button, but is constant on the listview.
VS 2008 - Balloon Tooltip Show Invalid Filename Characters
Apr 11, 2009I am using a Balloon tooltip to show the user which characters are invalid as a filename. I use the IO.Path.GetInvalidFileNameChars array and convert each character to a string, before appending it to a "Invalid filename characters:" string.
vb.net
If IO.Path.GetInvalidFileNameChars.Contains(e.KeyChar) Then
e.Handled = True
Dim str As String = "The following characters are invalid filename characters:" & nl
Dim invalidChars As New List(Of String)
For Each c As Char In IO.Path.GetInvalidFileNameChars
[Code] .....
The result is not pretty: How do I get rid of the 'non-visual' characters (they are probably newlines, backspaces, null chars, etc) so they don't clutter up the list?
Show The Error Icon And ToolTip When The User Is Editing The Cell In DataGridView?
Dec 29, 2009How do I show the error icon and ToolTip when the user is editing the cell in dataGridView?
View 8 RepliesBackground Thread Not Terminating
Jan 26, 2010I have a program that if user presses a key(while the program isn't focused),it presses some keys(some kind of macro to aid gamers).The program works,but I cannot stop the background thread.I use "t.abort()" (t is the name of background thread) but it keeps working(even when I close all forms) and at TaskManager "keypresser.exe" is still there.[code]
View 5 RepliesAccess Data From A Background Thread?
Oct 4, 2010I have an application that I need to load data in a background thread and make available to a combobox or list box on my main form or UI Thread. I am really new to threading in VB and how to best accomplish this. Here is some code from a test project:
[Code]...
Background Thread Suspend/resume?
Jun 22, 2010I have a a main thread and another background thread that does some work (see below).I want to do something within my worker thread and then wait until some other event happens in the main thread before continuing. How do I do this? I thought I could use ManualResetEvent but I can't get it to work properly. I'm a bit confused about the Set, Reset, WaitOne methods and where exactly I should call them from.When the worker thread is suspended it shouldn't affect the main thread.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System. EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code]....
C# - IO Operation Is Blocking UI And Background Thread
Jun 29, 2011I am a novice in Threads, but I want to know how to order thread execution in my scenario, and is the following :
UI Thread : Windows Form Background
Thread : Kind of print daemon
implemented with recursive methods
IO Operation : a StreamWriter that do
the job of File.AppendText()
When I execute my main app.exe, sometimes it launches the Windows Forms and the execution process in the task manager (app.exe), in some opportunities its just launches the execution process in background. How can I determine the behavior of launching UI, I have to establish a priority or somewhat else? Code: I'm using framework 2.0 and any answers could be writted in C# or Vb.Net.
Have Background Thread Handle Events?
Apr 7, 2011I am in the planning stages for developing a VB.Net class (let's call it OpDAq) that is to obtain data via an API provided by a COM object (AxInterop.TWSLib) that makes requests to an Internet server. The API provides data via events. Class OpDAq should do its work on a separate thread; it takes several seconds (sometimes up to ~10) to collect the desired data. One should be able to create several instances of OpDAq in order to collect data in parallel. The class would be given a reference to the TWSLib object when its constructor is called, as well as several parameters. There needs to be a way for the class to provide results, preferably in the form of a generic list.
View 6 RepliesHow To Optionally Run Some Code On Background Thread
Aug 28, 2011I'm looking for a configurable way to run some code on a background thread and I'm not too sure what the "best practice" would be. Currently I have something along the lines of:
Dim sendEmails = Sub()
Dim emailToSend As New SendEmailRequest()
TransferCommonValuesTo(emailToSend, request, sendingUser)
usersToSendEmailTo.ForEach(Sub(u)
[Code] .....
Is this a good way of implementing my requirement? This will be called from an ASP.NET front-end (although others are possible) and I am using Framework 3.5.
Iterate Over A Listview In A Background Thread?
Aug 16, 2011I've got an application with a ListView and I want to loop through each item in the ListView. But I want to do this in a separate thread.
This is a very simple version of the code - but its error is the same:
Private Sub StartToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles StartToolStripMenuItem.Click
pingThread = New Thread(AddressOf loopingRoutine)
[Code].....
Serial Use Of A Background Worker Thread?
Apr 6, 2012I have a BackgroundWorkerThread which I want to use serially.So some of the code in the UI thread will look like this [code]But of course I can't do the second RunWorkerAsync until the UI thread has seen the RunWorkerCompleted event indicating that the "Sequences" work has been completed (or somehow knows that the "Sequences" work has been completed).So I need some sort of synchronization between the two RunWorkerAsync calls, but whatever I use cannot hang up the UI thread because it has to be able to handle ProgressChanged events.Maybe the RunWorkerCompleted event could make the second call but I really don't like that structure.So how do I delay the second call to RunWorkerAsync (for the "Templates" work) until the background thread has completed the "Sequences" work?
View 6 RepliesVS 2008 Running A Thread In The Background?
Jun 9, 2009Im trying to run a thread in the background. The sub would take a string as as input and the text to speech object would read the string.
1st problem is: How do I pass my value strIn to my sub SpeekEventWorker when im calling it like this
[code]...
Access Uithread Components From The Background Thread?
Feb 24, 2009I can't seem to find a good tutorial on how to access uithread components from the background thread.. It seems like there is different means of accomplishing this. I'm not picky about which one I use.
View 1 RepliesBackground Worker Create Second Thread For Progress Bar?
Apr 6, 2011I have searched the forum and found several forums related to the backgroundworker thread but have been unsuccessful in finding my answer.My objective is to display an animated gif or progress bar while the program is executing a particular method which can take upwards of several minutes to complete. I cannot get the second thread to run the progress bar while the main progrem is executing the time consuming method. I have created a demo based on another thread and can't seem to get it to create two threads. I was attempting to get the backgroundworker to execute the progress bar while my main code runs on UI thread.
[Code]...