Auto highlight text in a textbox control

Question

How do you auto highlight text in a textbox control when the control gains focus

User · Answer

If your intention is to get the text in the textbox highlighted on a mouse click you can make it simple by adding:

this.textBox1.Click += new System.EventHandler(textBox1_Click);

in:

partial class Form1
{
    private void InitializeComponent()
    {

    }
}

where textBox1 is the name of the relevant textbox located in Form1

And then create the method definition:

void textBox1_Click(object sender, System.EventArgs e)
{
    textBox1.SelectAll();
}

in:

public partial class Form1 : Form
{

}

User · Answer

In Windows Forms and WPF   textbox SelectionStart   0  textbox SelectionLength   textbox Text Length

User · Answer

In window form c   If you use Enter event it will not work  try to use MouseUp event      bool FlagEntered      private void textBox1 MouseUp object sender  MouseEventArgs e                if   sender as TextBox  SelectedText        amp  amp   FlagEntered                         sender as TextBox  SelectAll                FlagEntered   true                       private void textBox1 Leave object sender  EventArgs e                FlagEntered   false

User · Answer

I don t know why nobody mentioned that but you can also do this  it works for me  textbox Select 0  textbox Text Length

User · Answer

textbox Focus    textbox SelectionStart   0  textbox SelectionLength   textbox Text Length

User · Answer

On events  Enter   for example  press Tab key  or  First Click  all text will be selected  dotNET 4 0  public static class TbHelper          Method for use     public static void SelectAllTextOnEnter TextBox Tb                Tb Enter    new EventHandler Tb Enter           Tb Click    new EventHandler Tb Click              private static TextBox LastTb       private static void Tb Enter object sender  EventArgs e                var Tb    TextBox sender          Tb SelectAll            LastTb   Tb             private static void Tb Click object sender  EventArgs e                var Tb    TextBox sender          if  LastTb    Tb                        Tb SelectAll                LastTb   null

User · Answer

textBoxX1 Focus     this ActiveControl   textBoxX1   textBoxX1 SelectAll

User · Answer

if you want to select all on  On Enter Event  this won t Help you achieving your goal  Try using  On Click Event       private void textBox Click object sender  EventArgs e                textBox Focus            textBox SelectAll

User · Answer

I think the easiest way is using TextBox SelectAll like in an Enter event   private void TextBox Enter object sender  EventArgs e          TextBox sender  SelectAll

User · Answer

If you wanted to only select all the text when the user first clicks in the box  and then let them click in the middle of the text if they want  this is the code I ended up using   Just handling the FocusEnter event doesn t work  because the Click event comes afterwards  and overrides the selection if you SelectAll   in the Focus event   private bool isFirstTimeEntering  private void textBox Enter object sender  EventArgs e        isFirstTimeEntering   true     private void textBox Click object sender  EventArgs e        switch  isFirstTimeEntering                case true              isFirstTimeEntering   false              break          case false              return             textBox SelectAll        textBox SelectionStart   0      textBox SelectionLength   textBox Text Length

User · Answer

In ASP NET  textbox Attributes Add  quot onfocus quot   quot this select    quot

User · Answer

Here s the code I ve been using  It requires adding the attached property to each textbox you wish to auto select  Seeing as I don t want every textbox in my application to do this  this was the best solution to me   public class AutoSelectAll       public static bool GetIsEnabled DependencyObject obj                  return  bool obj GetValue IsEnabledProperty               public static void SetIsEnabled DependencyObject obj  bool value                  obj SetValue IsEnabledProperty  value              static void ue Loaded object sender  RoutedEventArgs e                var ue   sender as FrameworkElement          if  ue    null              return          ue GotFocus    ue GotFocus          ue GotMouseCapture    ue GotMouseCapture             private static void ue Unloaded object sender  RoutedEventArgs e                var ue   sender as FrameworkElement          if  ue    null              return            ue Unloaded -  ue Unloaded          ue GotFocus -  ue GotFocus          ue GotMouseCapture -  ue GotMouseCapture             static void ue GotFocus object sender  RoutedEventArgs e                if  sender is TextBox                         sender as TextBox  SelectAll                      e Handled   true             static void ue GotMouseCapture object sender  MouseEventArgs e                if  sender is TextBox                         sender as TextBox  SelectAll                      e Handled   true             public static readonly DependencyProperty IsEnabledProperty   DependencyProperty RegisterAttached  IsEnabled   typeof bool           typeof AutoSelectAll   new UIPropertyMetadata false  IsEnabledChanged         static void IsEnabledChanged DependencyObject d  DependencyPropertyChangedEventArgs e                var ue   d as FrameworkElement          if  ue    null              return          if   bool e NewValue                        ue Unloaded    ue Unloaded              ue Loaded    ue Loaded                       The main change I made here was adding a loaded event to many of the examples I ve seen  This allows the code to continue working after it s unloaded  ie  a tab is changed   Also I included code to make sure the text gets selected if you click on the textbox with the mouse  and not just keyboard focus it  Note  If you actually click on the text in the textbox  the cursor is inserted between the letters as it should   You can use this by including the following tag in your xaml    lt TextBox       Text   Binding Property       Library AutoSelectAll IsEnabled  True    gt

User · Answer

You can use this  pithy   D  TextBox1 Focus        TextBox1 Select 0  TextBox1 Text Length

User · Answer

If you need to do this for a large number of textboxes  in Silverlight or WPF   then you can use the technique used in the blog post  http   dnchannel blogspot com 2010 01 silverlight-3-auto-select-text-in html  It uses Attached Properties and Routed Events

User · Answer

It is very easy to achieve with built in method SelectAll  Simply cou can write this   txtTextBox Focus    txtTextBox SelectAll      And everything in textBox will be selected

User · Answer

If you want to do it for your whole WPF application you can do the following  - In the file App xaml cs      protected override void OnStartup StartupEventArgs e                  works for tab into textbox         EventManager RegisterClassHandler typeof TextBox               TextBox GotFocusEvent              new RoutedEventHandler TextBox GotFocus              works for click textbox         EventManager RegisterClassHandler typeof Window               Window GotMouseCaptureEvent              new RoutedEventHandler Window MouseCapture             base OnStartup e             private void TextBox GotFocus object sender  RoutedEventArgs e                 sender as TextBox  SelectAll               private void Window MouseCapture object sender  RoutedEventArgs e                var textBox   e OriginalSource as TextBox          if  textBox    null               textBox SelectAll

[c#] Auto highlight text in a textbox control

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