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annotate MetroWpf/MetroWpf.Framework/Extensions/PropertyExtensions.cs @ 121:8f94475d3146 tip

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author stevenh7776
date Thu, 31 May 2012 15:35:26 +0100
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15
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1 using System;
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2 using System.ComponentModel;
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3 using System.Linq.Expressions;
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4
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5 namespace Chronos.Presentation.ViewModel
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6 {
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7 /// <summary>
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8 /// Property Extension Methods
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9 /// </summary>
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10 /// <remarks>
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11 /// http://reyntjes.blogspot.com/2009/04/master-detail-viewmodel_24.html
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12 /// http://blogs.ugidotnet.org/bmatte/archive/2008/11/28/pattern-model-view-viewmodel-inotifypropertychanged-static-reflection-e-extension-methods.aspx
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13 /// </remarks>
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14 public static class PropertyExtensions
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15 {
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16 #region · Extension Methods ·
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17
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18 /// <summary>
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19 /// Creates a <see cref="PropertyChangedEventArgs" /> instance for a given property.
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20 /// </summary>
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21 /// <typeparam name="T"></typeparam>
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22 /// <param name="property">The property.</param>
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23 /// <returns></returns>
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24 public static PropertyChangedEventArgs CreateChangeEventArgs<T>(this Expression<Func<T>> property)
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25 {
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26 var expression = property.Body as MemberExpression;
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27 var member = expression.Member;
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28
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29 return new PropertyChangedEventArgs(member.Name);
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30 }
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31
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32 /// <summary>
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33 /// Returns property name from expression
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34 /// </summary>
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35 /// <typeparam name="T"></typeparam>
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36 /// <param name="property"></param>
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37 /// <returns></returns>
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38 public static string GetPropertyName<T>(this Expression<Func<T>> property)
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39 {
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40 var expression = property.Body as MemberExpression;
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41
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42 return expression.Member.Name;
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43 }
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44
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45 /// <summary>
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46 /// Return property name from expression.
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47 /// </summary>
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48 /// <example>
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49 /// <![CDATA[
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50 /// Expression<Func<Item, object>> expression = i => i.Name;
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51 /// var propertyName = expression.GetPropertyName(); // propertyName = "Name"
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52 /// ]]>
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53 /// </example>
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54 /// <typeparam name="T"></typeparam>
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55 /// <typeparam name="TValue"></typeparam>
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56 /// <param name="expression"></param>
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57 /// <returns></returns>
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58 public static string GetPropertyName<T, TValue>(this Expression<Func<T, TValue>> expression)
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59 {
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60 var lambda = expression as LambdaExpression;
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61
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62 MemberExpression memberExpression;
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63
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64 if (lambda.Body is UnaryExpression)
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65 {
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66 var unaryExpression = lambda.Body as UnaryExpression;
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67 memberExpression = unaryExpression.Operand as MemberExpression;
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68 }
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69 else
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70 {
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71 memberExpression = lambda.Body as MemberExpression;
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72 }
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73
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74 if (memberExpression != null)
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75 {
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76 return memberExpression.Member.Name;
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77 }
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78
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79 return null;
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80 }
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81
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82 #endregion
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83 }
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84 }