2 // System.ComponentModel.ReferenceConverter.cs
5 // Martin Willemoes Hansen (mwh@sysrq.dk)
6 // Andreas Nahr (ClassDevelopment@A-SoftTech.com)
7 // Ivan N. Zlatev (contact@i-nz.net)
9 // (C) 2003 Martin Willemoes Hansen
10 // (C) 2003 Andreas Nahr
13 // Permission is hereby granted, free of charge, to any person obtaining
14 // a copy of this software and associated documentation files (the
15 // "Software"), to deal in the Software without restriction, including
16 // without limitation the rights to use, copy, modify, merge, publish,
17 // distribute, sublicense, and/or sell copies of the Software, and to
18 // permit persons to whom the Software is furnished to do so, subject to
19 // the following conditions:
21 // The above copyright notice and this permission notice shall be
22 // included in all copies or substantial portions of the Software.
24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 using System.Globalization;
34 using System.Collections;
36 namespace System.ComponentModel
38 public class ReferenceConverter : TypeConverter
41 public ReferenceConverter (Type type)
45 public override bool CanConvertFrom (ITypeDescriptorContext context,
48 if (sourceType == typeof (string))
50 return base.CanConvertFrom (context, sourceType);
53 public override object ConvertFrom (ITypeDescriptorContext context,
57 if (value is string && ((string)value) == "(none)")
59 return base.ConvertFrom(context, culture, value);
62 public override object ConvertTo (ITypeDescriptorContext context,
67 if (destinationType == typeof (string) && value == null)
69 return base.ConvertTo(context, culture, value, destinationType);
72 public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
74 ArrayList values = new ArrayList ();
76 return new StandardValuesCollection (values);
79 public override bool GetStandardValuesExclusive (ITypeDescriptorContext context)
84 public override bool GetStandardValuesSupported (ITypeDescriptorContext context)
89 protected virtual bool IsValueAllowed (ITypeDescriptorContext context, object value)