Console lignende Rich Text Box

CSharp kode 

 public class RichConsole : RichTextBox
     {
         public RichConsole()
             : base()
         {
             Text = ">";
             base.Select(Text.Length, 0);
         }
 
         public delegate void CommandHandler(RichConsole sender, string Command);
         public event CommandHandler CommandEntered;
 
         public string CurrentLine
         {
             get {
                 if (Text.Length == 0)
                     return "";
                 else if (Text.Contains("\n"))
                 {
                     return Text.Substring(Text.LastIndexOf("\n") + 2);
                 }
                 else
                     return Text.Substring(1);
             }
         }
 
         protected override void OnTextChanged(EventArgs e)
         {
             base.OnTextChanged(e);
             if (Text == "") Text = ">";
 
             base.Select(Text.Length, 0);
         }
 
         protected override void OnKeyDown(KeyEventArgs e)
         {
             base.OnKeyDown(e);
             if (e.KeyValue == 13)
             {
                 e.SuppressKeyPress = true;
                 if (CurrentLine.Length > 0)
                 {
                     string command = CurrentLine;
                     Text += "\r\n>";
                     CommandEntered(this, command);
                 }
             }
             else if (e.KeyValue == 8)
             {
                 if (CurrentLine == "")
                     e.SuppressKeyPress = true;
             }
         }
 
         protected override void OnSelectionChanged(EventArgs e)
         {
             base.OnSelectionChanged(e);
             base.Select(Text.Length, 0);
         }
     }