5 // Chris J Breisch (cjbreisch@altavista.net)
6 // Dennis Hayes (dennish@raytek.com)
8 // (C) 2002 Chris J Breisch
12 * Copyright (c) 2002-2003 Mainsoft Corporation.
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
30 * DEALINGS IN THE SOFTWARE.
33 using System.Globalization;
35 namespace Microsoft.VisualBasic.CompilerServices {
36 [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
37 [Microsoft.VisualBasic.CompilerServices.StandardModuleAttribute]
38 sealed public class BooleanType {
40 * The method converts given object to boolean by the following logic:
41 * 1. If input object is null - return null
42 * 2. If input object is String - run FromString method
43 * 3. Otherwise run .NET default conversion - Convert.ToBoolean
44 * @param value - The object that going to be converted
45 * @return boolean The boolean value that converted from the source object
47 public static System.Boolean FromObject (System.Object Value) {
48 if ((object)Value == null) return false;
49 if (Value is string)return FromString((string)Value);
50 return System.Convert.ToBoolean(Value);
53 * The method try to convert given string to boolean in a following way:
54 * 1. If input value is True or False string - return corresponding value
55 * 2. If input string represents number: return true if this number is not
56 * equals to zero, otherwise return false;
57 * @exception InvalidCastException - in case if number translation failed
58 * due to NumberFormatException.
59 * @exception All other thrown exceptions from ClrDobule.Parse
60 * @param str - The string that converted to boolean
61 * @return boolean The value that extracted from the input string.
63 public static System.Boolean FromString (System.String Value) {
64 if (string.Compare(Value, bool.TrueString, true) == 0)
67 if (string.Compare(Value, bool.FalseString, true) == 0)
71 if (double.TryParse(Value, NumberStyles.Any, NumberFormatInfo.InvariantInfo, out conv))
74 throw new InvalidCastException (
76 "Cast from string \"{0}\" to type 'Boolean' is not valid.",