mcs/class/System.Web/System.Web.UI.WebControls/UnitConverter.cs

   1 /**\r
   2  * Namespace: System.Web.UI.WebControls\r
   3  * Class:     UnitConverter\r
   4  *\r
   5  * Author:  Gaurav Vaish\r
   6  * Maintainer: gvaish@iitk.ac.in\r
   7  * Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>\r
   8  * Implementation: yes\r
   9  * Status:  100%\r
  10  *\r
  11  * (C) Gaurav Vaish (2002)\r
  12  */\r
  13 \r
  14 using System;\r
  15 using System.Globalization;\r
  16 using System.ComponentModel;\r
  17 using System.Web;\r
  18 using System.Web.UI;\r
  19 \r
  20 namespace System.Web.UI.WebControls\r
  21 {\r
  22         public class UnitConverter : TypeConverter\r
  23         {\r
  24                 public UnitConverter(): base()\r
  25                 {\r
  26                 }\r
  27 \r
  28                 public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)\r
  29                 {\r
  30                         if(sourceType == typeof(string))\r
  31                                 return true;\r
  32                         return CanConvertFrom(context, sourceType);\r
  33                 }\r
  34 \r
  35                 public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)\r
  36                 {\r
  37                         if(value == null)\r
  38                                 return null;\r
  39                         if(value is string)\r
  40                         {\r
  41                                 string val = ((string)value).Trim();\r
  42                                 if(val.Length == 0)\r
  43                                 {\r
  44                                         return Unit.Empty;\r
  45                                 }\r
  46                                 return (culture == null ? Unit.Parse(val) : Unit.Parse(val, culture));\r
  47                         }\r
  48                         return ConvertFrom(context, culture, value);\r
  49                 }\r
  50 \r
  51                 public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)\r
  52                 {\r
  53                         if(destinationType == typeof(string))\r
  54                         {\r
  55                                 Unit val = (Unit)value;\r
  56                                 if(val == Unit.Empty)\r
  57                                 {\r
  58                                         return String.Empty;\r
  59                                 }\r
  60                                 return val.ToString(culture);\r
  61                         }\r
  62                         return ConvertTo(context, culture, value, destinationType);\r
  63                 }\r
  64         }\r
  65 }\r