VS 2008 Custom DataGridViewRatingCell Forced RePaint
Jul 23, 2009
I have a project im working on in which data is loaded from a database using sqlite into a datagridview, one column in this datagridview is a custom rating column which windowsmedia like rating stars are displayed and when moused over the image is changed using the following custom column. When the mouse is moved in a cell the cell is forced to repaint and display the star image according to the mouse location in the cell.Now the odd thing is that this works perfectly when the data is loaded in with the SQLreader and added row by row, but when the data is loaded in using fill() using a datatable the cell will not repaint when moused over unless its row is currently selected or has been selected. Everything works fine loading the data row by row but loading time is much longer when there are 1000 items in a table.[code]
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Jan 20, 2010
paint events in my dgv, i have a dgv, that will be multi color and with some icons to indicate the state of the data. For example, i load all the data to my dgv, add a new image column to the dgv that will have three different icons, then the rows can have one of three colors. The values to set the colors and icons are in two columns of the data source table. And i have another var that indicates if the rows headers have numbers or not, just to help the user...
VB.NET
Private Sub frmGPConfirmar_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
fillDGV()
prepareDGV()
[code]....
So what i need it's how i can do this, paint the numbers in the rows Headers, put the images in the column, and change the back color of some rows?In other forms where i don't have this three conditions i can do what i want, but in this one i can't... or i can but i doesn't work very well...
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Oct 21, 2010
To me it seems that Update, Refresh and Repaint all do the same job but there are no doubt rules about when to use which. I would be grateful for any enlightenment.
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May 27, 2009
In my Tools/Options box under Projects and Solutions/Build and Run, I have selected: Before building: to "Don't save any Changes."However, after making changes to a form, I would like to run it without saving, but I get a message that forces me to save, unless it runs the version of the program before the changes were made.The VB 2005 edition works the way I want it to allow testing without saving, but VB2008 does not allow this.Is there any way I can change this behavior?
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Sep 2, 2009
I'm having a really hard time with this. I have a situation where I'm running an "internet kiosk" kind of situation. So i'm forcing firefox to run as a shell with some custom settings that prevent users from tampering with anything. Problem is, and this is well documented, you force windows to use something thats not explorer.exe as the shell - you get to wait 2 min before the welcome screen dies. I'm running XP Home - I've tried disabling the Welcome screen in the registry but, nothing seems to work. I keep running across snippets of code refering to something like this:[code]
I've used C++ a few times, so I sorta kinda get whats going on, but I have no idea how to implement it. A lot of people are talking about just adding these snippets to the beginning of their custom shell applications. My shell *is* an application, so i can't add any code. I need to know how to send this signal to the kernal so i can shorten my boot time. I'm assuming I need to take some VB code and turn it into an EXE so i can run it at boot - I tried SHELLing this out to cscript.exe in a batch file, but it says theres errors.
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Jan 25, 2012
I have a web service with both SOAP and REST endpoints. I have to accept requests from a client that I do not have any control over on my REST endpoint. Currently the client gets a 400 response and the tracelog on my server shows this error:
The incoming message has an unexpected message format 'Raw'.
The expected message formats for the operation are 'Xml', 'Json'.
I've tried everything I can think of with the WebContentTypeMapper but seem to end up right where I started every time. The request from the client doesn't appear to be well formed XML or JSON so if I try to force XML or JSON types from the WebContentTypeMapper I end up with parser errors.
So I guess I need to find out if I can force this endpoint to accept the message anyway.
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Oct 6, 2010
I have a web service with both SOAP and REST endpoints. I have to accept requests from a client that I do not have any control over on my REST endpoint. Currently the client gets a 400 response and the tracelog on my server shows this error:The incoming message has an unexpected message format 'Raw'. The expected message formats for the operation are 'Xml', 'Json
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Feb 25, 2011
How can we repaint our controls at run-time without flicker (hiding them first and showing them afterwards)?
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Apr 22, 2010
I have a program written with VB.NET 2008 that includes a large number of dynamic controls in a form. When I drag the corner of my form, I want to resize every controls according to the new form size. It works very well, except that the controls are repainted one by one, instead of waiting at the end of my fonction and do a single repaint.
I did a lot of research on the NET without any good results:
- "Form1.DoubleBuffered = true" does not have any effect
- "Form1.SuspendLayout" does not have any effect
- "SendMessage(Me.Handle, WM_SETREDRAW, New IntPtr(CInt(False)), IntPtr.Zero)" suspended repaints but left the entire window messy.
I am running out of ideas. Here is a sample module to test if your trick works. Just try to resize the form, you will see how long it takes to repaint every control one by one:
[Code]...
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May 31, 2012
I'm looking for a way to limit Picturebox repaints. For example, I wish to be able to only call "repaint" a certain amount of times per second. All my searchs have come up with nothing. I could start a timer and get it to call repaint manually but that only ends up calling it more as it doesn't stop the normal form raising the event.
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Jan 5, 2011
After debugging a particularly tricky issue in VB.NET involving the order in which instance variables are initialized, I discovered that there is a breaking discrepancy between the behavior that I expected from C# and the actual behavior in VB.NET.Nota bene: This question concerns a slight discrepancy in the behaviors of VB.NET and C#. If you're a language bigot that is unable to provide an answer other than "that's why you should use C#, noob", there is nothing for you to see here; kindly move along.Specifically, I expected the behavior outlined by the C# Language Specification (emphasis added):
When an instance constructor has no constructor initializer, or it has a constructor initializer of the form base(...), that constructor implicitly performs the initializations specified by the variable-initializers of the instance fields declared in its class. This corresponds to a sequence of assignments that are executed immediately upon entry to the constructor and before the implicit invocation of the direct base class constructor. The variable initializers are executed in the textual order in which they appear in the class declaration.
Contrast that with the portion of the VB.NET Language Specification concerning Instance Constructors, which says (emphasis added): When a constructor's first statement is of the form MyBase.New(...), the constructor implicitly performs the initializations specified by the variable initializers of the instance variables declared in the type. This corresponds to a sequence of assignments that are executed immediately after invoking the direct base type constructor. Such ordering ensures that all base instance variables are initialized by their variable initializers before any statements that have access to the instance are executed.
The discrepancy here is immediately obvious. C# initializes class-level variables before calling the base constructor. VB.NET does exactly the reverse, apparently preferring to call the base constructor before setting the values of instance fields.If you want to see some code, this related question provides a more concrete example of the divergent behavior. Unfortunately, it does not provide any hints as to how one might coerce VB.NET into following the model established by C#.
I'm less interested in why the designers of the two languages chose such divergent approaches than I am in possible workarounds for the problem. Ultimately, my question is as follows: Is there any way that I can write or structure my code in VB.NET to force instance variables to be initialized before the base type's constructor is called, as is the standard behavior in C#?
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Jan 6, 2012
I'm having issues with a progressbar. I've created a progressbar that reads registry variables and uses that input to update the progressbar and some status messages (so I can call it from vbscripts, etc). I want it so when my status bar hits 100%, the bar stops, waits a few seconds, and then quits. However, it seems the program processes the remaining code and quits the application before it has time to completely repaint the progress bar (I'm guessing this because it will usually update to about 10% before it exits).. I'm using something like this...
If prcnt = 100 Then
progbar.Style = ProgressBarStyle.Blocks
progbar.Value = 0
[code].....
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Jun 8, 2011
I have developed a program which continuously draws a circle using a timer. Now every time the circle gets displays it flickers and which is because i have used me.refresh. Is there any other way to avoid this flickering.
Here is my code
Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles Timer1.Tick
Me.sweepAngle += 1
If Me.sweepAngle = 360 Then
[CODE]....
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Aug 7, 2010
Is it possible to make a "Custom.Custom"? Example:
Custom.Custom1 = "1"
Custom.Custom2 = "2"
and
MessageBox.Show(Custom.Custom2)
Would show "2"
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Jul 16, 2009
To refresh or invalidate only a region of the form.sometimes I will need refresh all the form, but in some situations only specific regions of the form..I saw some samples on the Microsft site, but I don't understood.I use VB .net 2008
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Feb 6, 2009
This is what I would like to achieve:To create a custom messagebox, with varying number of buttons with custom .Text descriptions, and other features. I intended to have a property array that would be redim-ed and have values (.Text values) set by the calling class:
[code]...
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Jun 25, 2009
I came across this great article on creating a custom datagridview column which creates a graph-like effect in the cells of a custom datagridview column:[URL]..Does anyone know how you would edit this to format the number in the cell as a percentage? And does anyone know how you would set this up to take 0 values which do not create any graph effects at all.I have been trying to do this but keep getting errors.
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Jan 31, 2012
I was trying to block the closing of a custom combo box popup window in my custom DataGrid. The popup window comes by pressing F4 or ALT+DOWN keys in my datagrid which is getting closed if I press the down arrow for the first time, after showing the first value in the combo box as selected. Next time onwards, if I press the F4 key and down arrow, I can move to any item in the popup window and select the item using keyboard and in that case, the popup window is not getting closed till I press the ENTER key or selection using the Mouse. Is there any specific reason for this behaviour or something is missing in my code part? [code]...
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Sep 2, 2010
I was trying to block the closing of a custom combo box popup window in my custom DataGrid. The popup window comes by pressing F4 or ALT+DOWN keys which is getting closed if I press the down arrow for the first time after showing the first value in the combo box as selected. Next time onwards, if I press the F4 key and down arrow, I can move to any item in the popup window and select the item using keyboard and in that case, the popup window is not getting closed till I press the ENTER key or selection using the Mouse.
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Dec 29, 2011
how to specify a custom icon for display in the toolbox window when you create your own custom control? Something other than the dreaded "gearbox" icon.
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Dec 8, 2009
How would I use "custom Hotkeys"? For example, if my textbox's text is F5, then how would I use GetAsyncKeyState to get "F5"?
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Jan 30, 2010
i have a list object that i am displaying on a dgv, most of the properties are straight forward but it contains a list within it. I am trying to display some of the properties of the list within a combobox column for the dgv but what i end up with is an identical combobox for each row which contains all the info for the entire list of items. here is the relevent code which constucts the combobox column.
Public Class frmJobs
Private Sub DataGridView1_RowsAdded(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewRowsAddedEventArgs) Handles
[Code].....
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Oct 4, 2011
I've not really worked with them before, well at all really. How would I go about creating a control which has multiple picture boxes, so then I can access each picturebox and refer to them via custom properties? I'm not aware you can draw several picture boxes and combine them into one control?
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Nov 5, 2010
I am writing a program and I need a way for the user to input information into a pop up screen, i.e. may be up to 10 settings for the program. I have looked at using a parent and child form but it seems somewhat difficult to pass data between forms. I have also looked at custom dialog boxes but it seems like there would be an easier way? Is there a way that a form or similar box could pop up when a button on form1 was pressed and then the user could make the needed selections and then click ok on form 2. This would then save the selections to some global variable that could be accessed by form1 after form 2 has been closed?
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Aug 28, 2009
I am using VS/VB 08 together with access 07 for my project. I am trying to fill my datagridview using a custom SQL query where the "where" criteria is altered to accept the column name from the selection of the user. When a user clicks on a column in the datagrid I want that column to be represented in the query. This is what I have but is not working. Is this possible by the way?
[Code]...
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Dec 19, 2011
Im creating a simple application to search and manipulate a database.I want to add a text box to search a name but I want the textbox to be eyecandy. I dont want the traditional textbox.I dont know how to make custom controls.
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Aug 8, 2011
i've been trying to use customcontrols made in vb.net 2008 but when i try to add them to a vba form using
Dim x as new MyCustomControl.Usercontrol
Me.Controls.Add(x)
it returns "activex can't create object" The control itself has nothing special, it's just random textboxes and a few buttons. why i can't use the control?
Edit: TLB has been addeded on references.
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Dec 16, 2009
I have a dll application that has its own app.config file associated with it.It has custom sectiongroups, sections, element collections, etc.The application name is WireShopAutomation.dll, so the built config ends up as WireShopAutomation.dll.config.The problem is that I seem to be unable to open the section group.The error message is:"Could not load type 'WireShopAutomation.cfgSectionGroup_WireShopMain' from assembly 'WireShop Automation'"It seems to find the config file, but not the class handler for the section group and possibly the assembly itself.The class handler for this is in the same project as the application itself.[code]I should've also indicated that I can see the properties of configuration file in the Config object. In fact, I can even see the WireShopAutomation_Main section group. However, it can't seem to access it.
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Dec 13, 2011
Cookies to be stored in folder and on close delete the cookies The ability to watch youtube vids, view images, and play js/flash games good security, no ads?
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Jun 6, 2009
im creating my own custom form design for some of my programs...i would like to get the basic form down and then save it as a template...before i can do that i need some help designing and creating the form. Im going for a windows office 2007 sorta look with a glowing orb at the top right. I need a few coding elements to implement first.
[Code]...
yes these are all things capable with the traditional windows form but i want something more my style. Also im creating a orb like thing in the top left and a minimize/maximize/close button at the top right. I was going to use just images...is this the best way or can i create better graphics in wpf or something like that? Some more things that i would like but dont nessarly need would be the capablity to make my form with the clear vista aero glass instead of a single static color...i dont know mutch about this but is there an easy way to extend the vista aero glass theme across forms and if so what would that look like on xp machines.
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