How to track which character is deleted in TextBox in WPF?

Posted by Ashish Ashu on Stack Overflow See other posts from Stack Overflow or by Ashish Ashu
Published on 2010-06-16T08:08:34Z Indexed on 2010/06/16 8:12 UTC
Read the original article Hit count: 266

Filed under:

wpf

|

textbox

|

wpf-controls

I want to track which character is deleted by the user through Delete or BackSpace Key.

I am handling RichTextBox_ChangedEvent of textbox.

Can I extract the deleted character from TextChangedEventArgs *e.Changes* and if yes How can I do that?

I want to restrict user to from deleting any characters from the TextBox. I want user can delete only two characters ( let's say "(" or ")" )

Please suggest.

© Stack Overflow or respective owner

Related posts about wpf

C#/WPF - RoutedEvent in WPF class that isn't a UIElement

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a class that needs to notify that something significant has occured. The class is in a WPF-project, even though this specific class, is lookless (and doesn't inherit from UIElement, neither directly or indirectly). Normally, I just register a RoutedEvent to get this functionality but as this… >>> More
How to pass value from wpf form to wpf user control

as seen on Stack Overflow - Search for 'Stack Overflow'
Hai am having a WPF user control in my WPF Form, when i click my button in my form , i just want to pass some value to the textbox which is in the usercontrol, tell me how to do this. >>> More
WPF opening up exe program within WPF window

as seen on Stack Overflow - Search for 'Stack Overflow'
Not sure if this is possible but is there a way to open up another program like notepad within the container of a WPF window? similiar to that of being able to open a web page using the webbrowser control? Basically I would like to open notepad or other exe but keep it constrained within the WPF… >>> More
Silverlight Commands Hacks: Passing EventArgs as CommandParameter to DelegateCommand triggered by Ev

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Today I've tried to find a way how to pass EventArgs as CommandParameter to DelegateCommand triggered by EventTrigger. By reverse engineering of default InvokeCommandAction I find that blend team just ignores event args.To resolve this issue I have created my own action for triggering delegate commands… >>> More
Building applications with WPF, MVVM and Prism(aka CAG)

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
In this article I am going to walk through an application using WPF and Prism (aka composite application guidance, CAG) which simulates engaging a taxi (cab). The rules are simple, the app would have3 screens A login screen to authenticate the user An information screen. A screen… >>> More

Related posts about textbox

Display weekday in textbox or label using date from textbox

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a textbox with calendar extender and a label <label for="<%= tbxFrom.ClientID %>"> From</label> <asp:Label ID="lblWeekDayFrom" runat="server"></asp:Label> <asp:TextBox ID="tbxFrom" runat="server" CssClass="Calendar"></asp:TextBox> … >>> More
cast value of a textbox to a textbox in another form

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to paste the values from a textbox in form1 to textbox in form2. I did that, but while i upgraded my aplication it stopped to work. I allso need that couse i get an error(incorect data type in conditional statement) when i want to insert a value from a textbox (to a access database) that's… >>> More
Populate Textbox in UserForm Using Contents of Another Textbox

as seen on Stack Overflow - Search for 'Stack Overflow'
I have 5 worksheets and would like all the textboxes to display the same value, whatever the user enters in the first textbox. Can that be done without code? How would I do it with code? >>> More
Binding "Text-Property" of a derived textbox to another textbox doesn´t work

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, i have a class 'MyTextBox' that derives from the default TextBox in Silverlight. This class currently contains no additional code. I set up a binding in xaml to bind the Text-Property of MyTextbox to another Textbox to reflect the input made in the Textbox. The effect is that MyTextBox doesn´t… >>> More
Using an HTML Textbox in place of an ASP.NET TextBox

as seen on Stack Overflow - Search for 'Stack Overflow'
If I add this to the ASPX page: <input id="Text1" type="text" value="Text1Value" /> I would expect to see "Text1" in the list of Request Form keys even WITHOUT setting the runat=Server property. ? request.Form.AllKeys I realize that if I do set that propery, then I will have a server-sided… >>> More