2 // System.ComponentModel.BaseNumberConverter.cs
5 // Andreas Nahr (ClassDevelopment@A-SoftTech.com)
7 // (C) 2002/2003 Ximian, Inc (http://www.ximian.com)
8 // (C) 2003 Andreas Nahr
12 // Permission is hereby granted, free of charge, to any person obtaining
13 // a copy of this software and associated documentation files (the
14 // "Software"), to deal in the Software without restriction, including
15 // without limitation the rights to use, copy, modify, merge, publish,
16 // distribute, sublicense, and/or sell copies of the Software, and to
17 // permit persons to whom the Software is furnished to do so, subject to
18 // the following conditions:
20 // The above copyright notice and this permission notice shall be
21 // included in all copies or substantial portions of the Software.
23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 using System
.Globalization
;
35 namespace System
.ComponentModel
37 public abstract class BaseNumberConverter
: TypeConverter
39 internal Type InnerType
;
41 protected BaseNumberConverter()
45 internal abstract bool SupportHex
{
49 public override bool CanConvertFrom(ITypeDescriptorContext context
, Type sourceType
)
51 return sourceType
== typeof (string) || base.CanConvertFrom (context
, sourceType
);
54 public override bool CanConvertTo(ITypeDescriptorContext context
, Type t
)
56 return t
.IsPrimitive
|| base.CanConvertTo (context
, t
);
59 public override object ConvertFrom(ITypeDescriptorContext context
, CultureInfo culture
, object value)
62 culture
= CultureInfo
.CurrentCulture
;
64 string text
= value as string;
68 if (text
.Length
>= 1 && text
[0] == '#') {
69 return ConvertFromString (text
.Substring (1), 16);
72 if (text
.StartsWith ("0x") || text
.StartsWith ("0X")) {
73 return ConvertFromString (text
, 16);
77 NumberFormatInfo numberFormatInfo
= (NumberFormatInfo
) culture
.GetFormat(typeof(NumberFormatInfo
));
78 return ConvertFromString (text
, numberFormatInfo
);
79 } catch (Exception e
) {
80 // LAMESPEC MS wraps the actual exception in an Exception
81 throw new Exception (value.ToString() + " is not a valid "
82 + "value for " + InnerType
.Name
+ ".", e
);
86 return base.ConvertFrom (context
, culture
, value);
89 public override object ConvertTo(ITypeDescriptorContext context
, CultureInfo culture
,
90 object value, Type destinationType
)
93 throw new ArgumentNullException ("value");
96 culture
= CultureInfo
.CurrentCulture
;
99 if (destinationType
== typeof (string) && value is IConvertible
)
100 return ((IConvertible
) value).ToType (destinationType
, culture
);
102 if (destinationType
== typeof (string) && value.GetType () == InnerType
) {
103 NumberFormatInfo numberFormatInfo
= (NumberFormatInfo
) culture
.GetFormat (typeof (NumberFormatInfo
));
104 return ConvertToString (value, numberFormatInfo
);
108 if (destinationType
.IsPrimitive
)
109 return Convert
.ChangeType (value, destinationType
, culture
);
111 return base.ConvertTo (context
, culture
, value, destinationType
);
114 internal abstract string ConvertToString (object value, NumberFormatInfo format
);
116 internal abstract object ConvertFromString (string value, NumberFormatInfo format
);
118 internal virtual object ConvertFromString (string value, int fromBase
)
121 throw new NotImplementedException ();
123 throw new InvalidOperationException ();