To make Combobox controls spell checkable, we implement the ISpellCheckableTextComponent interface in a simple wrapper class, that maps to the combobox.  This allows us to add the wrapper as a ‘textbox’ to be spell checked.

C# Code Example

1. Add this class to the project

   using System;
   using System.Text;
   using Keyoti.RapidSpell;
   using System.Windows.Forms; 

   namespace Main
   {

       public class ComboBoxISpellCheckableWrapper : ISpellCheckableTextComponent

       {

           ComboBox comboBox;

           public ComboBoxISpellCheckableWrapper(ComboBox cb)
           {
               comboBox = cb;
               comboBox.GotFocus += new EventHandler(comboBox_GotFocus);
               comboBox.Disposed += new EventHandler(comboBox_Disposed);
           }
    

           void comboBox_Disposed(object sender, EventArgs e)
           {
               comboBox.GotFocus -= new EventHandler(comboBox_GotFocus);
               comboBox.Disposed -= new EventHandler(comboBox_Disposed);
               if (Disposed != null) Disposed(this, e);
           }
    

           void comboBox_GotFocus(object sender, EventArgs e)
           {
               if (GotFocus != null) GotFocus(this, e);
           }
    

           public void Dispose()
           {
               comboBox.Dispose();
           }
    

           public event EventHandler Disposed;
    
           public bool Enabled
           {
               get { return comboBox.Enabled; }
           }
    

           public event EventHandler GotFocus;
    
           public bool HideSelection
           {
               get
               {
                   return false;
               }
               set
               {
                   //cant map
               }
           }
    

           public bool ReadOnly
           {
               get { return false; }
           }
    

           public void ScrollToCaret()
           {
               
           }
    

           public string SelectedText
           {
               get
               {
                   return comboBox.SelectedText;
               }
               set
               {
                   comboBox.SelectedText = value;
               }
           }
    

           public int SelectionLength
           {
               get
               {
                   return comboBox.SelectionLength;
               }
               set
               {
                   comboBox.SelectionLength = value;
               }
           }

           public int SelectionStart
           {
               get
               {
                   return comboBox.SelectionStart;
               }
               set
               {
                   comboBox.SelectionStart = value;
               }
           }
    

           public string Text
           {
               get
               {
                   return comboBox.Text;
               }
               set
               {
                   comboBox.Text=value;
               }
           }
       }

   }

    

2. Use it like this

rapidSpellDialog1.AddTextComponent(new ComboBoxISpellCheckableWrapper(comboBox1));

(or by setting the ThirdPartyTextComponentToCheck property).