82 lines
2.6 KiB
C#
82 lines
2.6 KiB
C#
//
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// System.ComponentModel.CharConverter
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//
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// Author:
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// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
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// Ivan N. Zlatev (contact@i-nz.net)
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//
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// (C) 2003 Andreas Nahr
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// (C) 2008 Novell, Inc. (http://www.novell.com)
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Globalization;
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namespace System.ComponentModel
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{
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public class CharConverter : TypeConverter
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{
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public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
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{
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if (sourceType == typeof (string))
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return true;
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return base.CanConvertFrom (context, sourceType);
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}
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public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
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{
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string char_string = value as string;
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if (char_string != null) {
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if (char_string.Length > 1)
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char_string = char_string.Trim ();
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if (char_string.Length > 1)
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throw new FormatException (string.Format (
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"String {0} is not a valid Char: " +
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"it has to be less than or equal to " +
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"one char long.", char_string));
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if (char_string.Length == 0)
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return '\0';
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return char_string [0];
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}
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return base.ConvertFrom (context, culture, value);
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}
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public override object ConvertTo (ITypeDescriptorContext context,
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CultureInfo culture, object value, Type destinationType)
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{
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if (destinationType == typeof (string)) {
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if ((value != null) && (value is char)) {
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char c = (char) value;
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if (c == '\0')
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return String.Empty;
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else
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return new string (c, 1);
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}
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}
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return base.ConvertTo (context, culture, value, destinationType);
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}
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}
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}
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