mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Base/Core/Internal/PropertyEditing/State/PersistedStateUtilities.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4 namespace System.Activities.Presentation.Internal.PropertyEditing.State
   5 {
   6
   7     // <summary>
   8     // A set of utility methods we use to persist state
   9     // </summary>
  10     internal static class PersistedStateUtilities
  11     {
  12
  13         // <summary>
  14         // Escapes '&,;.' characters
  15         // </summary>
  16         // <param name="s">String to escape</param>
  17         // <returns>Escaped string</returns>
  18         public static string Escape(string s)
  19         {
  20             if (string.IsNullOrEmpty(s))
  21             {
  22                 return null;
  23             }
  24
  25             s = s.Replace("&", "&&");
  26             s = s.Replace(",", "&comma&");
  27             s = s.Replace(";", "&semicolon&");
  28             s = s.Replace(".", "&dot&");
  29             return s;
  30         }
  31
  32         // <summary>
  33         // Unescapes '&;,.' characters
  34         // </summary>
  35         // <param name="s">Escaped string</param>
  36         // <returns>Unescaped string</returns>
  37         public static string Unescape(string s)
  38         {
  39             if (string.IsNullOrEmpty(s))
  40             {
  41                 return null;
  42             }
  43
  44             s = s.Replace("&comma&", ",");
  45             s = s.Replace("&semicolon&", ";");
  46             s = s.Replace("&dot&", ".");
  47             s = s.Replace("&&", "&");
  48             return s;
  49         }
  50
  51         // <summary>
  52         // Converts 0 -> false, 1 -> true, anything else -> null
  53         // </summary>
  54         // <param name="digit">digit to convert</param>
  55         // <returns>True/False/Null</returns>
  56         public static bool? DigitToBool(string digit)
  57         {
  58             return "0".Equals(digit) ? false : ("1".Equals(digit) ? true : (bool?)null);
  59         }
  60
  61         // <summary>
  62         // Converts true -> 1, false -> 0
  63         // </summary>
  64         // <param name="value">Value to convert</param>
  65         // <returns>Bool as a digit string</returns>
  66         public static string BoolToDigit(bool value)
  67         {
  68             return value ? "1" : "0";
  69         }
  70     }
  71 }