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I have a textbox and it need the user not allow to enter any specialcharecters
He can enter 1. A-Z
2. a-z
3. 0-9
4. Space.
How can I make the KeyDown event to do this?
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Rather than use KeyDown, try PreviewKeyDown on this instead. More importantly though, are you sure you've thought this through properly? What happens if the user presses the backspace or Delete key? What about the Tab key?
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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What I need is he can't enter any special characters in the textbox.
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How do you define a special character? You need to think about your requirements a bit more. For instance, what about an apostrophe? If you're masking inputs like this, you wouldn't allow my surname through - and that would seriously annoy me (to the point where I probably wouldn't use your product).
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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I like to use the KeyPress event. Here is a sample that allows only alpha characters, numbers, and the control keys like enter, tab, backspace, delete, etc.
Private Sub txtMyTextbox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtMyTextbox.KeyPress
If Char.IsDigit(e.KeyChar) OrElse Char.IsControl(e.KeyChar) OrElse Char.IsLetter(e.KeyChar) Then
e.Handled = False
Else
e.Handled = True
End If
End Sub
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Hi ,
I have a gray scale 12 bit dicom image in the byte array and i need to display it in the image control. I tried Bitmapsource.create it has onli 8 bit and 16 bit options in it.
Can anyone please tell me how to display the 12 bit image in the image control.
Thanks
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You'll have to modify the 12 bit image - take a look at this[^] article for more information.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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Where did Dependancy property register.
Now where did this Button text DP register. Becoz DP is the static property how can the system will now that the "Ok" text is of btn.
and if i create another Button btn2 with text "Cancel" How it differiniate the two text.
if i old property system
btn.Text = "Ok";
btn1.Text = "Cancel";
it make scence to me becoz each property is have differrnt instance of Button.
can u plz explain it in some detail?????
WANTED wasim khan(Killed 50 Innocent Buggs, Distroyed 200 Exception, make 5 Project Hostage) any Compnay Hire him will pay 30,000. Best place where u can get him is Sorcim Technologies Murre Road RWP
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wasimsharp wrote:
This should not build...You should get a "The property 'text' was not found
in type 'Button'." error.
So where is this "Text" or "text" property coming from?
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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is it fine 
Now plz if u clear me the DependancyProperty.Register() Method what itdo ???
WANTED wasim khan(Killed 50 Innocent Buggs, Distroyed 200 Exception, make 5 Project Hostage) any Compnay Hire him will pay 30,000. Best place where u can get him is Sorcim Technologies Murre Road RWP
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wasimsharp wrote: if u clear me the DependancyProperty.Register() Method what itdo ???
You're wondering what the Register() method does?
WPF uses a different property system than regular .NET properties.
I imagine Register() adds your dependency property to its property system, providing
information about it - its name, type, class, and metadata.
Dependency Properties Overview[^]
Custom Dependency Properties[^]
Mark Salsbery
Microsoft MVP - Visual C++
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Take a look at the Chris Anderson "Essential Windows Presentation Foundation" book Appendix on Properties. There is a partial sample on how to design the Dependency Property subsystem from scratch.
Chris Anderson is the WPF Architect and in this excellent book he describes the WPF Architectural decisions and why they are were taken.
Cheers,
Oleg V. Polikarpotchkin
ovp
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I have a cctv dvr that I am trying to view from my wpf application. I have added a web browser control on my form on which I can browse most web pages. When I try to go to the link http:\\120.0.0.1, the address of my machine where I installed the dvr card I get the exception below.
I can come across a couple of suggestions on the web, but nothing seems to work, I am using VS 2008 on a vista machine.
System.AccessViolationException was unhandled
Message="Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
Source="WindowsBase"
StackTrace:
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.Run()
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at Glowworm.App.Main() in C:\Users\Marwa\Documents\Visual Studio 2008\RunningProjetcs\Glowworm\Glowworm\obj\Debug\App.g.cs:line 0
at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:
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Hello,
in my application i load a external .XAML file, in this XAML file i have a UserControl with some Controls in it and some Storyboards. My Main-Application loads this UserControl into a Border and adds the Storyboard to his own Resources.
Now i'm able to play this animation with the correct controls and so on, everything works fine... But! I can't set the Storyboard.SpeedRatio, no matter if i use Storyboard.SpeedRatio = 0.5 or StoryBoard.SetSpeedRatio(this.animationObject.Child as FrameworkElement, 0,5)
Nothing of those both works! The Animation has everytime the same length...
When i debug my application and starts the animation and asks for the actual SpeedRatio, .NET says it is "1", so ... how do i change that?
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softwarejaeger wrote: StoryBoard.SetSpeedRatio(this.animationObject.Child as FrameworkElement, 0,5)
Couldn't find this overload with 3 parameters ?
Documentation[^] mentions containingObject to be "The object specified when the Begin method was called. This object contains the Clock objects that were created for this storyboard and its children." Have you considered that ?
See here[^], might be of some interest
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Hi,
I want to implement TV tuner component in WPF application.
Please if any one have idea how to do this please reply me.
Thanks in advance
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Sorry. Please ask WPF question in this forum[^]. Thank you!
Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)
Microsoft MVP (Silverlight), WPF/Silverlight Insiders
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Hi,
I am working on a silver light application. In this I have to display weather report i.e., weather forecast in my silver light application. In this we should have an option to display the weather report of any location that we select.
If any one have any idea how to solve this please reply me.
Thanks in advance.
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What part are you having trouble with?
Mark Salsbery
Microsoft MVP - Visual C++
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Hi,
I developed a silverlight2.0 application. In this I have to open a web page from a silver light page like we open a web page using a web browser control.
I tried with
Browser.HtmlPage.Navigate("http://www.microsoft.com")
System.Windows.Browser.HtmlPage.Window.Navigate(new Uri("urlString"));
HtmlPage.Window.Navigate(new Uri("http://localhost:1780/MusicAlbum.aspx"));
but didn't worked in my application
If any one have any idea on this please reply me.
Thanks in advance.
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What didn't work?
These all work for me:
System.Windows.Browser.HtmlPage.Window.Navigate(new Uri("http://www.microsoft.com"));
System.Windows.Browser.HtmlPage.Window.Navigate(new Uri("http://www.microsoft.com"), "_blank", "toolbar=no,location=no,status=no,menubar=no,resizable=yes");
System.Windows.Browser.HtmlPage.Window.Navigate(new Uri("http://www.microsoft.com"), "_newWindow");
if (System.Windows.Browser.HtmlPage.IsPopupWindowAllowed)
{
System.Windows.Browser.HtmlPage.PopupWindow(new Uri("http://www.microsoft.com"), "_blank", null);
}
Mark Salsbery
Microsoft MVP - Visual C++
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Hello Guys, I thought I'll ask this question under the WPF forum since ObservableCollection is a WPF class.
I have a class Client of which I use to return a collection of clients from the database as an ObservableCollection:
ObservableCollection<Client> myClients = queries.GetClients();
where GetClients() is a method that returns a list of clients of type ObservableCollection<Client>
Now I use LINQ to run a search for clients as follows:
ObservableCollection<Client> filteredClients = null;
IEnumerable<Client> qry = from c in myClients
where c.Name.ToUpper().Contains(txtSearch.Text.ToUpper())
orderby c.Name
select c;
filteredClients = new ObservableCollection<Client>(qry);
Hence filteredClients is supposed to contain a subset of myClients of the same type ObservableCollection<Client>
My problem is that this works fine on my x64 vista/machine, but when I move it to my x86 vista/machine I get an error that:
Argument '1': cannot convert from 'System.Collections.Generic.IEnumerable<Client>' to 'System.Collections.Generic.List<Client>'
After poking around a bit, I discovered that in my Visual Studio (both machines run VS.NET 2008 on Framework 3.5) on the x64 machine,
the ObservableCollection<T> class has 3 overloads and one of them accepts an IEnumerable<T>, which is exactly what qry above is.
However, on my x86 as you can guess, there are only 2 constructors and IEnumerable<T> isn't one of the parameters. Just an empty overload and one that receives a List<T>
So then my question is why is there this disparity in the number of overloads on vista x64 platform and vista x86?
Does this mean that I would have to design an auxiliary class that'll return a List<T> from my backend rather than an ObservableCollection<T> for x86 platforms?
P.S:
That is just one of the compatibility problems I believe those of us building applications with WPF are facing. Another one I hit is that if I have a ListBox with a DataTemplate and I set its SelectedValuePath, it works fine on my x64 machine but appears null on my x86 machine.
My 2 pennies for other developers out there is that if you are building on x64 and it works great and looks good, please make sure you test on an x86 machine before hitting your customers
Thanks.
Live in fragments no longer. Only connect.
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Do you have .Net 3.5 SP1 on the x86 machine ? The IEnumerable overload was added with .Net 3.5 SP1.
MSDN[^]
If you want your app to run on both x64 and x86 then you should set the targetted CPU to x86 (default is Any). This will ensure it runs on both platform (although slower on x64 as it will run under WOW)
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Ok. Will try that. Thanks
Live in fragments no longer. Only connect.
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Hai iam new to silverlight and i want one application of weather report in silverlight.
can any body know pls help plssss
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