DataGridView Retains Wait Cursor When Updated From Thread
Jun 9, 2010
I have a DataGridView control in my Windows Forms Application. I am adding rows to the grid using a background thread. I change the form's cursor to Waitcursor when the process starts and back to Default when it ends. This works well for the form, but not for the grid. When the form's cursor is changed back to default, the grid's cursor does not change, although the cursor over the rest of the form does.
I am updating the grid from a background thread? (The cursor is being changed from the UI thread directly). The background process raises an event, the handler checks the InvokeRequired property of the grid and decides if it needs to "Invoke" the method again from the main thread. So, in effect the actual UI update happens from the appropriate thread. I am not sure if this means that I am "using a background thread" or not.
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Jul 2, 2009
How can I set the curosr to 'cursor.wait' for the whole display screen and not just for the application form? I have tried "Windows.Forms.Cursor.Current = Cursors.WaitCursor" And several variations but without success.
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Mar 23, 2010
i have have a MDI child form which have different textbox for criteria and a datagridview for result.When i launch the research i change the cursor : me.usewaitcursor = True when it finish i go back me.UseWaitCursor = False It works but some times (not all the time) if you move the cursor over the datagridview during the research, the cursor still in WaitCursor OVER the datagridview, it didn't go back to default but on the rest of the form is good (default arrow).I have tried whith : Me.cursor , cursor or cursor.current but i have the same result/problem.
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Jul 14, 2009
I have an MDI WinForms app in which the MDI parent form has a ToolStrip, MenuStrip and StatusStrip. Whenever the mouse is moved over one of these controls the cursor changes to a 'wait' cursor (a arrow with an hourglass). This seems to be default behaviour in that there is no code to make this happen. The UseWaitCursor property of both the ToolStrip and MenuStrip is false; StatusStrip does not have this property. This occurs in both debug and release builds and confuses the users who think that the app is 'doing' something when really it isn't! Does anyone know what is causing this to happen, and more importantly how to make it stop?
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Oct 4, 2009
I am using VB.NET and I would really like to know how to change the Default Wait Cursor, as well as all the other cursors.I can currently change the normal cursor for my form with the following code:
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Aug 25, 2009
I'm developing a big VB.Net Winforms application. Every now and again, processing or db connections take some time and therefore I'd like a wait cursor (hourglass) to appear sometimes. I know I can do it like in this thread (in case someone needs the code):Hourglass?- technical discussion - developer Fusion - ASP.NET, C# Programming, VB.NET, .NET Framework, Java and Visual Basic Tutorials However, I have LOTS of code and I don't know when the user will need to wait. So, what I'd really want is to tell my ApplicationEvents file or the like to globally intercept after say 0.3 seconds and turn the arrow (default cursor) into the hourglass and at the same time disable mouse clicks and the like.
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Mar 17, 2010
I was thinking how can i add a wait cursor to my listview box.I want the wait cursor to only appear at the top left side of listvie box.
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Dec 13, 2010
The wait cursor cannot be changed for a numericupdown for which i have a _valuechanged private sub.
how to set it to the normal cursor?
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Feb 18, 2010
I'm coding an advanced web browser. The bad thing is, is that whenever you move your cursor over the window, a wait cursor is displayed. I tried to deselect the wait cursor but it doesn't work! I'm using Visual Basic 2010 Beta 2...
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Apr 20, 2011
I tried to increment a value as long as I press a button. The incremented value is connected via binding to a TextBox. The problem occures when I update the underlaying integer. I get an exception that another Thread owns it.
<Button Name="Up"
Content="Up"
PreviewMouseLeftButtonDown="Up_PreviewMouseLeftButtonDown"
[Code]....
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May 24, 2011
Is there a synchronous wait function that won't tie up the UI-thread in .NET WPF? Something like:
Sub OnClick(sender As Object, e As MouseEventArgs) Handles button1.Click
Wait(2000)
'Ui still processes other events here
MessageBox.Show("Is has been 2 seconds since you clicked the button!")
End Sub
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Jan 19, 2009
I have been reading the async design patterns on MSDN and the general idea makes sense to me but in practice it is proving to be more difficult. I am working on a project utilizing VMWARE VIX.
HTML Code: [url]. Each function such as connecting to a host server, retrieving properties, etc. can be executed in two different ways.
Connecting to a host using a blocking Wait:
Code:
Dim m_lib As New VixLib
Dim m_hostJob As VixCOM.IJob
[CODE]...
Code:
Dim m_lib As New VixLib
Dim m_hostJob As VixCOM.IJob
dim m_callback as VixCOM.ICallback
[CODE]...
The problem with the VIX SDK is that sometimes the functions never return, hanging the application. dblock.
HTML Code:[URL] came up with a library that specifies a timeout value. When the timeout runs out the method aborts and returns regardless whether it finished or not.
The callback method is an active wait where the code continues to execute. What I want to implement is a blocking wait with a timeout. The ICallback interface has one sub OnVixEvent(IJob,Integer,IVixHandle). This method is fired at least twice, first when some progress is posted and second when it is complete. The first call to this method can be one second after registering the callback or 30 seconds, so I can not rely on this method to block the main thread. how to create some kind of async result class that would block the main thread from executing until either a timer runs out or the OnVixEvent method returns an Operation Complete signal that also implements ICallback.
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May 20, 2011
When I use the Publish command in the Build menu pillar nothing happens expcept for a few seconds showing the wait cursor. This was working a week or two back but I have now installed sp1 for Visual Studio 2010 - is this a bug or is there some way. I can get this working again. I cannot access the project properties either, which is a known problem with SP1, so how to edit the project.vbproj file.
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Jan 23, 2012
Basically after I queue all works, I want to wait until all I queued has been done. How do I do so?[code]I notice there is no way to know how many threads are still running in the threadpool.
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Apr 9, 2011
I have a problem with releasing locks on a thread. [Code] If Me.IsStarted Then 'checks if my service is started and ready of service requests 'code here to enqueue my job and objRxResult with the service so it can populate it with the result before Pulsing back 'the service has its own thread that it dequeues jobs off of and processes them on it own time 'during this key enqueue phase we block attempts to stop the service, thus the _objIsStarted lock [Code].
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Sep 20, 2010
I want to be able to run a thread and then at a certain point pause it and wait for the user to enter some text into a text box and then when they press submit i want the program to run again from where it left off.
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Dec 31, 2010
Is it possible to wait/suspend execution for a certain amout of time without hanging the main UI thread?
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Oct 21, 2009
I load a DataGridView (VB.Net, VS2005) using the code below. The save logic works fine for manual edits oh the cells.However, I run some code that updates a Status column in every row then I call the same Save logic. All rows execpt the first row are updated! I am updating the Datasource (dvCerts)Ah.... I just tried changing the CurrentCell to 1,0 instead of 0,0 and now the data saves OK.
Load_...
daCerts.SelectCommand = New SqlCommand("SELECT * FROM PERP_ARB_Certificates", conPERP)
Dim cmdBldr As New SqlCommandBuilder(daCerts) ' used for grid save
[code].....
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Apr 20, 2010
I have a datagridview bound to bindingsource. Whenever I delete a row, it is not updated to the underlying database table. I have to click elsewhere in the form to cause the dgv_rowValidated to fire where I have the following code in there to push changes to the database:
bs,EndEdit
Dim cb As New SqlCommandBuilder(myDataAdapter)
myDataAdapter.Update(myDataSet)
Normally, where do I place such code for updating when comes to deleting a row in datagridview? I noticed userDeletedRow event does not fired when I am deleting the last row in a one row datagridview.
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Sep 15, 2009
I use two DataGridView´s to manage my database. DataGridView2 is filled with data from a table depending on what value you select in DataGridView1. I also have a search-function so I can search for specific values in DataGridView2. In pictures below I have searched for GroupID = 1 I can also copy all the values in the DataGridView2 into the database if I want to. The data often states what kind of values to use to use during a test of a machine. Sometimes I want to copy all the parameters for one machine and use on another machine. I have added a column that is used to write down notes about the data in the table. This is the only column not copied (except the primary key column) when I press copy. Its called Tableinfo
I can then search the active table for all rows where that column is empty. When I have changed the values or just confirmed that everything is alright I have a button called "Save" that fills that column with the string "Saved" so those rows doesn´t appear next time.
Here is where the problem occurs. When I press the save button I can see that the whole column is filled with the correct value. But when i press update the first row doesnt get updated. No matter how many rows there is in the DataGridView.
If I fill in all the rows manually it works. If I press the save button and then click in the cell of the first row where is says "Saved" and then update it gets updated correctly.
[Code].....
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Oct 26, 2010
I have a datagridview which I am populating of a database, scrollbars are disabled to allow for autoresize
I created a Scroll Event that causes me some issues:
1. I can scroll down only
2. To move from one row to the next I need to rotate the mouse-wheel up in between two rows - as if the row index isn't being updated
3. The procedure results in an error : Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Public Sub grdScroll(ByVal sender As Object, ByVal e As ScrollEventArgs)
Dim RowIndex As Integer = grdAccountTypes.CurrentRow.Index + e.NewValue
' grdAccountTypes.CurrentRow.Index = grdAccountTypes.CurrentRow.Index + e.NewValue
grdAccountTypes(0, RowIndex).Selected = True
[Code] .....
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Oct 12, 2010
I have code similar to the code below that works in other parts of my program. The reason the code below does not work is because the datatable is made up of data from two separate tables. Does anyone know how to make this work for multiple tables? Can I choose what fields to send back and where to send them? This is what fills my datagridview and it works fine.
[Code]....
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May 3, 2011
I have a DataTable that's constantly being updated with new data from my database via a timer. That data is eventually reformatted and displayed in a DataGridView control.In an effort to prevent the DataGridView from completely refreshing from re-databinding (thus, clearing out selections, resetting scrollbars, defaulting sorting settings, and making the gridview flash as it reupdates), I'm simply removing old rows from the datagrid that no longer exist in the DataTable, and adding new rows to the datagrid that appear in the DataTable since the last update.
For the sake of simplicity, we'll call DataGridView the LEFT table, and DataTable the RIGHT table I'm looking for a way to go through both tables (LEFT and RIGHT), and remove old rows that are no longer in RIGHT and delete them from LEFT. And look for new items in RIGHT and add them to LEFT. Each table has a column called "RecID" containing a unique id for each entry that can be used for comparison. is there a way to do this all in one loop? What I'm looking for, in pseudo code:
<loop through everything>
if RecID does not exist in LEFT but exists in RIGHT
add new item to LEFT
if RecID does exist in LEFT but does not exist in RIGHT
[code]....
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May 17, 2009
currently i had a program which working fine when its running in the solution explorer,but after published,problem comes.my datagridview cant show updated data while my database access already update...my datagridview only show existed data.could it be my datagrid problem?i get my data programmatically or is my INSERT command doesn't update the dataset?but in the solution explorer does show the dataset was updated. [code]
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May 22, 2008
I have an Access database that is updated directly in Access. I'm trying to write a program to 'monitor' the database, and have a DataGridView control showing the contents. When the program is first started, it shows the current data in the DB fine, however, I've been unable to get it to refresh with any updated data from the mdb file. I have a timer running on 5 second intervals, and if i clear the dataset, the DataGridView refreshes to empty.
[Code]...
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Aug 25, 2010
I can edit the values in the dgv cells manually, add rows, delete rows all without problem and then update the database.My problem is in one form where I want to allow the user to filter the rows in the grid and then enter a value in a textbox and programmatically update all the cells in one column with that valueI can update the rows, and see the changes in the datagridview. When I try and update the database (using UpdateQuery on the underlying TableAdapter of the datagird) only some of thechanged rows are being updated I though it might be related
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Jan 21, 2011
I have a drop down menu, and based on which item is selected, I call a web service and then dynamically create some text boxes.The first time I drop down the menu and select an item, it works perfectly, and the text boxes are created and populated dynamically. However, the next time I drop down the menu (after the first postback), and select something different..fter the second postback, the original values remain in the textboxes.
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Jul 1, 2009
part of my code is in below
[Code]...
I would expect to see the path.Path include the new record, however, I also notice that tempnextgen also include the new record. Can anyone help me out on this issue? Why the tempnextgen got updated as well, how to prevent this unexpected operation?
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May 27, 2009
While navigating to a series of sites at one site the WebBrowser control's DocumentCompleted EVENT is tripped and no other recorded Browser events occur after that. When this happens the hour glass cursor indicates the browser is waiting. From this point it take 120 to 250 seconds of wall clock time before the browser resumes. I am looking for a way to force an abnormal termination without destroying the control. I have tried "Stop", "nav to about:blank" repeatedly without success. How can I force an abnormal termination when the Cntrl is in a wait state?
Consider the following: The last known Browser event to be tripped is a Document Complete event; nothing else occurs after this. When this transpires the Cntrl is waiting.
1:50:657: ============================= ENTER WebBrowser1_DocumentCompleted EVENT ========================================
31:50:657: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^THE NEW WEBBROWSER STATEMENT
[code]....
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Jul 10, 2009
i use this method to move cursor to right
Imports System.Runtime.InteropServices
Public Class Form1
Public Const WM_HOTKEY As Integer = &H312
[code].....
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