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annotate Chronosv2/source/Extensions/PropertyExtensions.cs @ 14:741981715d94

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Initial review and translations
author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 18:59:30 +0700
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1 /*
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2 The MIT License
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3
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4 Copyright (c) 2009-2010. Carlos Guzmán Álvarez. http://chronoswpf.codeplex.com/
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5
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6 Permission is hereby granted, free of charge, to any person obtaining a copy
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7 of this software and associated documentation files (the "Software"), to deal
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8 in the Software without restriction, including without limitation the rights
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9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 copies of the Software, and to permit persons to whom the Software is
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11 furnished to do so, subject to the following conditions:
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12
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13 The above copyright notice and this permission notice shall be included in
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14 all copies or substantial portions of the Software.
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15
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16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 THE SOFTWARE.
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23 */
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24
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25 using System;
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26 using System.ComponentModel;
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27 using System.Linq.Expressions;
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28
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29 namespace Chronos.Presentation.ViewModel
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30 {
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31 /// <summary>
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32 /// Property Extension Methods
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33 /// </summary>
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34 /// <remarks>
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35 /// http://reyntjes.blogspot.com/2009/04/master-detail-viewmodel_24.html
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36 /// http://blogs.ugidotnet.org/bmatte/archive/2008/11/28/pattern-model-view-viewmodel-inotifypropertychanged-static-reflection-e-extension-methods.aspx
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37 /// </remarks>
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38 public static class PropertyExtensions
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39 {
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40 #region · Extension Methods ·
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41
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42 /// <summary>
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43 /// Creates a <see cref="PropertyChangedEventArgs" /> instance for a given property.
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44 /// </summary>
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45 /// <typeparam name="T"></typeparam>
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46 /// <param name="property">The property.</param>
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47 /// <returns></returns>
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48 public static PropertyChangedEventArgs CreateChangeEventArgs<T>(this Expression<Func<T>> property)
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49 {
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50 var expression = property.Body as MemberExpression;
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51 var member = expression.Member;
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52
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53 return new PropertyChangedEventArgs(member.Name);
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54 }
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55
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56 /// <summary>
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57 /// Returns property name from expression
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58 /// </summary>
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59 /// <typeparam name="T"></typeparam>
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60 /// <param name="property"></param>
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61 /// <returns></returns>
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62 public static string GetPropertyName<T>(this Expression<Func<T>> property)
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63 {
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64 var expression = property.Body as MemberExpression;
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65
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66 return expression.Member.Name;
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67 }
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68
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69 /// <summary>
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70 /// Return property name from expression.
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71 /// </summary>
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72 /// <example>
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73 /// <![CDATA[
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74 /// Expression<Func<Item, object>> expression = i => i.Name;
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75 /// var propertyName = expression.GetPropertyName(); // propertyName = "Name"
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76 /// ]]>
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77 /// </example>
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78 /// <typeparam name="T"></typeparam>
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79 /// <typeparam name="TValue"></typeparam>
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80 /// <param name="expression"></param>
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81 /// <returns></returns>
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82 public static string GetPropertyName<T, TValue>(this Expression<Func<T, TValue>> expression)
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83 {
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84 var lambda = expression as LambdaExpression;
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85
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86 MemberExpression memberExpression;
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87
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88 if (lambda.Body is UnaryExpression)
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89 {
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90 var unaryExpression = lambda.Body as UnaryExpression;
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91 memberExpression = unaryExpression.Operand as MemberExpression;
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92 }
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93 else
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94 {
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95 memberExpression = lambda.Body as MemberExpression;
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96 }
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97
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98 if (memberExpression != null)
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99 {
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100 return memberExpression.Member.Name;
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101 }
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102
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103 return null;
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104 }
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105
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106 #endregion
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107 }
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108 }