Enter key pressed event handler

Question

I want to capture the text from the textbox when enter key is hit   I am using WPF visual studio 2010  NET 4   I dont know what event handler to be used in the  tag    I also want to do the same for maskedtextbox

User · Accepted Answer

Either KeyDown or KeyUp   TextBox tb   new TextBox    tb KeyDown    new KeyEventHandler tb KeyDown    static void tb KeyDown object sender  KeyEventArgs e        if  e KeyCode    Keys Enter                  enter key is down

User · Answer

You can also use PreviewKeyDown in WPF    lt TextBox PreviewKeyDown  EnterClicked    gt    or in C    myTextBox PreviewKeyDown    EnterClicked    And then in the attached class   void EnterClicked object sender  KeyEventArgs e        if e Key    Key Return            DoSomething            e Handled   true

User · Answer

The KeyDown event only triggered at the standard TextBox or MaskedTextBox by  normal  input keys  not ENTER or TAB and so on   One can get special keys like ENTER by overriding the IsInputKey method   public class CustomTextBox   System Windows Forms TextBox       protected override bool IsInputKey Keys keyData                if  keyData    Keys Return              return true          return base IsInputKey keyData             Then one can use the KeyDown event in the following way   CustomTextBox ctb   new CustomTextBox    ctb KeyDown    new KeyEventHandler tb KeyDown    private void tb KeyDown object sender  KeyEventArgs e        if  e KeyCode    Keys Enter                    Enter key is down              Capture the text           if  sender is TextBox                            TextBox txb    TextBox sender                MessageBox Show txb Text

User · Answer

In WPF  TextBox element will not get opportunity to use  Enter  button for creating KeyUp Event until you will not set property  AcceptsReturn  True    But  it would t solve the problem with handling KeyUp Event in TextBox element  After pressing  ENTER  you will get a new text line in TextBox    I had solved problem of using KeyUp Event of TextBox element by using Bubble event strategy  It s short and easy  You have to attach a KeyUp Event handler in some  any  parent element   XAML    lt Window x Class  TextBox EnterButtomEvent MainWindow      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      xmlns d  http   schemas microsoft com expression blend 2008      xmlns mc  http   schemas openxmlformats org markup-compatibility 2006      xmlns local  clr-namespace TextBox EnterButtomEvent      mc Ignorable  d      Title  MainWindow  Height  350  Width  525  gt   lt Grid KeyUp  Grid KeyUp  gt       lt Grid RowDefinitions gt           lt RowDefinition  gt           lt RowDefinition Height  Auto   gt           lt RowDefinition Height  Auto   gt           lt RowDefinition Height   0 3    gt           lt RowDefinition Height  Auto   gt           lt RowDefinition Height  Auto   gt           lt RowDefinition  gt       lt  Grid RowDefinitions gt       lt Grid ColumnDefinitions gt           lt ColumnDefinition  gt           lt ColumnDefinition  gt           lt ColumnDefinition  gt       lt  Grid ColumnDefinitions gt       lt TextBlock Grid Row  1  Grid Column  1  Padding  0  TextWrapping  WrapWithOverflow  gt          Input text end press ENTER       lt  TextBlock gt       lt TextBox Grid Row  2  Grid Column  1  HorizontalAlignment  Stretch   gt       lt TextBlock Grid Row  4  Grid Column  1  Padding  0  TextWrapping  WrapWithOverflow  gt          You have entered       lt  TextBlock gt       lt TextBlock Name  txtBlock  Grid Row  5  Grid Column  1  HorizontalAlignment  Stretch   gt   lt  Grid gt  lt  Window gt    C  logical part  KeyUp Event handler is attached to a grid element    public partial class MainWindow   Window       public MainWindow                 InitializeComponent               private void Grid KeyUp object sender  KeyEventArgs e                if e Key    Key Enter                        TextBox txtBox   e Source as TextBox              if txtBox    null                                this txtBlock Text   txtBox Text                  this txtBlock Background   new SolidColorBrush Colors LightGray                                     Result

User · Answer

For those who struggle at capturing Enter key on TextBox or other input control  if your Form has AcceptButton defined  you will not be able to use KeyDown event to capture Enter    What you should do is to catch the Enter key at form level  Add this code to the form   protected override bool ProcessCmdKey ref Message msg  Keys keyData        if   this ActiveControl    myTextBox   amp  amp   keyData    Keys Return                   do something         return true            else               return base ProcessCmdKey ref msg  keyData

[c#] Enter key pressed event handler

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