I have a standard winforms treeview control that keeps flickering whenever I hover my mouse over any other control on the form. I would like to doubleBuffer the treeview to reduce the flickering but I have no idea how to do so.
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I have a form where i put controls at runtime. Everything works fine and fast. I also set the doublebuffer property of the controls to true and then there is no flickering at all. But then i proceed to add an image in the background (also during runtime), but then each item i move is flickering even if i remove all the controls and only leave the background image when i move another form it flickers anyway.I put an example below of how im adding the image.
Public originalImage As Image = Nothing
Private Sub Panel2_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Panel2.Paint
If originalImage IsNot Nothing Then
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my class inherits from TreeView. In it's constructor, it adds nodes. In the Winforms designer, if I put an instance of the Treeview on the Form, the nodes are visible. That's ok.
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I'm trying to bind a WinForms TreeView control to some user-defined objects. In particular, I'd like to bind aTreeNode.Text property to myObject.Name. My strategy is to create xTreeNode, a subclass of TreeNode, add a DataBindings collection, and expose its Text property. This would allow me to write some code like this:
Dim oBinding as Binding
Dim bs as New BindingSource
bs.DataSource = myObj
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I have a problems with my application..
1. collapse and expand treeview when i click plus sign (+) on treeview, treeview didn't expand subfolder but when i click image, treeview expand it.
2. showing path that i check on treeview when i check the treeview then i'm click the button, then return path that i check
This is my code..
i have a treeviev and listbox.i want to display the selected contents of treeview into the listbox.my code is working for file but not for folder. means i want, if the all contents of folder ABC(i.e all files) are selected then in listbox i want to show the only path of folder not the seperate path of each file.
View 1 RepliesIs it possible to set a project default for VB.NET winforms projects so that the default Modifier for controls added to winforms is Private (not Friend)?I know there's a "modifiers" property in the properties window so I can set it for each individual control however I would like to change the project so from now on myself and other developers have to specifically decide to change from friend to private. (Which I would strongly discourage them from doing).I believe there is no way of doing this, but on another forum a while ago someone mentioned it would be possible with an add-in (but didn't name the add-in or where to get it).
View 1 Repliesi have a treeview say TV1 and another Treeview Say TV2.. Now TV1 Contains all nodes for user rights. and i want to add to tv2 only selected nodes.Like TV1 is
Node 1
....Child of Node 1 (Level 2)
.........Child of Child of Node 1 (Level 3)
what i want is that when i select Level3 Node it should chek TV2 for the parent of this node. if parent exist it should add the node under the same parent. if parent does not exist it should check for Level 1 Node and if it exist it should add Level 2 Node and then Level 3 Node. Otherwise it should add Level 1 , Level 2 and then Level 3 Nodes in order.
I have a class, let's call MyClass. In this class, I have a TreeView property let's call myTreeView..In my code, I populate the Nodes of this TreeView so I can use it later on.Then, when it's time to actualy use it, I haven't been able to take all the nodes from myClass and put them in a Tree View Control on my form.[code]The weird thing is that when debugging, the TreeView in MyClass is well populated with the proper values and in the loop, newNode isn't empty, there's actually something but for some reason it's not showing anything.
View 2 RepliesI'm running out of walls to bang my head against. Okay new windows form with a textbox, button and TreeView Populate the TreeView.nodes with the default nodes via properties
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I want to click button1 and have the name of the childnode? Node3? placed in the textbox. Not via selection, I can do that. But via index or item number. The code I have is as follows
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I have a proto-type winform app designed by a colleague. My original plan was to create it using asp.net, but I'm not sure if I should just 're-create' it using asp.net or continue forward using the winforms. Either way, I'd use vb.net as the code-behind.
It's going to be a data collection app; originally it was going to allow the collection screens to by dynamically built, based on options selected by the end-users. However, that has changed to a one-size fits all approach.
I've never written anything using asp.net, so what I'd really like is some advice about what should I be looking for/at in this new app, in order to decide which way to finish it... asp.net OR winforms... Would there be any design/programming advantages to using asp.net over the winforms (other than the fact that my colleague already have about a dozen forms designed, but with NO code-behind)? Might there be end-user advantages to using asp.net vs winforms?
I'm currently studying for one of Microsoft's MCPD 3.5 certifications (VB 2008) and one of the things it makes use of is WPF applications. Based on what I've seen of them so far, they are basically like Windows Forms Applications. So my question about them is why was WPF created? What was Microsoft looking to accomplish with WPF since outside of the "web feel" in a windows environment, it basically looks like a WinForms application. What is the difference between the two and when sould I use one over the other?
View 1 RepliesCan i access ASP.NET Database From Withing Winforms Application ? If i expect it requires web server can i have any example, any online sites that can show me the pattern of simple web server?
View 1 RepliesAnimated GIF in Winforms
View 9 RepliesQuestion: I want to control cmd.exe from winforms. I DO NOT mean every command in a single process, with startupinfo, and then stop. I mean for example start the (My) SQL or GDB command prompt, send command, receive answer, send next command, receive next answer, stop SQL command prompt exit process. Basically I want to write a GUI on top of any console application.
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Is there anything like WindowLicker(a GUI test framework) but for .NET's WinForms?
View 3 RepliesCan we use css formatting in a vb application to give some enhancement? Examples would be changing the font color and or background? Are there any other way to customize a (VB)desktop application?
View 4 RepliesWe're building an application using VB.net and WPF. Obviously we've found that there are huge differences between the syntax in the two, and we have a few problems trying to do things in Form apps in WPF.If possible, could you pass us some resources on things like switching between WPF windows, we'd use Show() and Close() in WinForms, and referencing variables from other forms, i.e. otherForm.StrVariable references StrVariable from otherForm.
View 2 RepliesI'm creating a playlist in Visual Studio 2010 Winforms and I would like to have allow the user to shuffle the songs played. I was thinking of something like:
If CheckBox1.Checked = True Then //Shuffle checkbox
Me.ListBox2.SelectedIndex = Random(20)
AxWindowsMediaPlayer.URL = ListBox2.SelectedItem
End If
And hopefully the 1 of the 20 songs in the ListBox2 will be randomly selected. But this code does not work; "Random is a type and cannot be use as an expression".
I've come up against a rather tricky problem that I cant seem to find an answer to.I have a WinForms program that runs locally on a PC with a SQL Server Express database to store its data.There is also a remote database that i need to save data to the first time that the program is run (a registration type thing).
The remote database will only accept connections from known IP adresses so to get around this, I have set up an ASP.NET site on the server that the remote database resides on and the data will be saved from here.
In my program, I have a form that has a webbrowser component on it that points to the asp site (with me so far?).The user fills in the form and clicks a button on the form that will fire the form to submit, save the data on the remote DB and retrieve a serial number that is displayed on the screen.
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I would like to change just a little bit the outlook of the form's top region in my application (the icon, bar, and controbox), is there any way to accomplish this without using third party components ?, I'd like to have my own Winform control that inherits from Windows.Forms.Form.[url]...
View 6 RepliesPossible Duplicate: Porting VB.NET Winforms Application to C# .Is there any way to convert a vb.net winforms application into c# ? In terms of both code and .vb (forms) files.
View 2 RepliesIn a .NET 3.5 Winforms app, after a user provides a username and password, I set a custom principal in the CurrentPrincipal property like this:My.User.CurrentPrincipal = Service.GetPrincipal(username)This is done in a method that is called using Invoke, because the originating thread is not the UI thread:Invoke(New Action(AddressOf doLogin))But when I click on a button in the Winforms application, the CurrentPrincipal property has been reverted to its default, the current Windows user.Dim lPrincipal = My.User.CurrentPrincipal ' not my custom principalApparently, using Invoke while setting the principal does not solve the problem. Is there another way to set the CurrentPrincipal property for all threads in the application?
View 1 RepliesI know it most likely possible to access a winforms menu like an array but I am not seeing it in the menu designer of VS2008? What I mean is, my app has a typical menu bar across the top, with multiple items on each drop down. As it is written (I inherited this code), each menu item is a separate name, i.e.
myMenuOption1MenuItem
myMenuOption2MenuItem
myMenuOption3MenuItem
myMenuOption4MenuItem
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Obviously I could set/unset each menu item by name, but for a lot of reasons I'd prefer to use loops.
I am working on a windows forms project that will allow a user to have an interface to the database, and another will be a nightly run process file that will update the database table.The user will add new records to the table, whereas the nightly process will update the columns with new values (think mortgage interest rates)
Both these projects will be using the same business logic component that has the calculations needed to enter values into the table.The way I am figuring this out, is that I will have two exe's (one for the interface and one for the nightly process) and have a central object that will host the calculations. What would be the best object for this purpose?A class file?A windows service? (I want to stay away from a windows service, because it will have to be running all the time)
In my Winforms application, i've got a form and an associated business layer class. All controls are bound. When i click a button i call a method on the class which then starts a background worker and returns. The background worker does some processing and finishes.
The problem i'm having is that i'm using a label to display any error messages generated by this background worker, which is fine but after a set time i want to clear the label, so for that i'm using a timer (on the business layer class), which, when it fires, is on a different thread and thus should not update the property that the label is bound to Whats the best way to do update the label? -- Should i be using a delegate to update the property value, if so how do i invoke it?Note i'm also having a problem with getting the databinding of the visible property on this label to work.
Check this:Can I add ListViewGroup in WPF? Or a equivalent to that?
View 3 RepliesWhenever I want to modify a winform from another thread, I need to use ->Invoke(delegate, params)so that the modification occurs in the winform's own thread.
For every function that needs to modify the gui, I need another delegate function.Is there some scheme which allows me to limit the number of delegate functions needed? I have a controller class which handles the whole gui in one spot, I've thought about reusing delegates but that smells badly.I think that my question can apply to all languages where winform can run
know the millisecond interval, used by the framework trackbar, between calling the ValueChanged event when moving the grip with a mouse?I've implemented my own trackbar and I'd like the behaviour to be consistent with what the user expects.I've had a look in reflector but it's one of those controls where most of the implementation is not viewable.
ETA: Actually, thinking about it, it's not as simple as that. For small changes, the TrackBar is raising the event for every change. However, if you make a large fast change with the grip, it will not raise the event for every step. Just wondering exactly how the framework does this?
We have a form that hosts the WebBrowser control. That is the only control on the form.We pass the form the file path of a temporary PDF file and it does:WebBrowser1.Navigate(Me._PathToPdf)When the form is closing, it navigates away from the PDF file:
WebBrowser1.Hide()
WebBrowser1.Navigate("about:blank")
Do Until WebBrowser1.ReadyState = WebBrowserReadyState.Complete
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