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annotate SilverlightValidation/SilverlightValidation.Tests/TestSupport/NotifyPropertyChangedEventWatcher.cs @ 97:1adc1ae981ea

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Tests added to SilverlightValidation.Tests
author stevenhollidge <stevenhollidge@hotmail.com>
date Sat, 05 May 2012 16:39:00 +0100
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97
1adc1ae981ea Tests added to SilverlightValidation.Tests
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1 using System;
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2 using System.Collections.Generic;
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3 using System.ComponentModel;
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4 using System.Diagnostics;
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5 using System.Diagnostics.CodeAnalysis;
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6 using System.Globalization;
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7 using System.Linq.Expressions;
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8
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9 namespace SilverlightValidation.Tests.TestSupport
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10 {
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11 /// <summary>
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12 /// A helper class used by NotifyPropertyChangedAssertHelper to monitor PropertyChangedEvent notifications.
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13 /// </summary>
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14 public class NotifyPropertyChangedEventWatcher : Disposable
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15 {
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16 private readonly Dictionary<string, int> _raisedCounts = new Dictionary<string, int>();
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17
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18 // A reference to the instance of the class implementing INotifyPropertyChanged
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19 private INotifyPropertyChanged _model;
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20
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21 /// <summary>
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22 /// Initializes a new instance of the <see cref = "NotifyPropertyChangedEventWatcher" /> class.
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23 /// </summary>
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24 /// <param name = "model">The model.</param>
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25 public NotifyPropertyChangedEventWatcher(INotifyPropertyChanged model)
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26 {
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27 if (model == null) throw new ArgumentNullException("model");
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28
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29 _model = model;
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30 _model.PropertyChanged += OnPropertyChanged;
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31 }
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32
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33 [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters"),
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34 SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
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35 public int GetRaisedCount<T>(Expression<Func<T>> propertyExpression)
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36 {
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37 return GetRaisedCount(PropertySupport.ExtractPropertyName(propertyExpression));
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38 }
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39
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40 public int GetRaisedCount(string propertyName)
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41 {
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42 propertyName = string.IsNullOrEmpty(propertyName) ? string.Empty : propertyName;
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43
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44 PropertySupport.VerifyPropertyName(_model, propertyName);
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45
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46 return _raisedCounts.ContainsKey(propertyName) ? _raisedCounts[propertyName] : 0;
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47 }
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48
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49 private void RecordPropertyChanged(string propertyName)
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50 {
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51 if (_raisedCounts.ContainsKey(propertyName))
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52 {
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53 _raisedCounts[propertyName]++;
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54 }
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55 else
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56 {
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57 _raisedCounts[propertyName] = 1;
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58 }
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59 }
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60
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61 /// <summary>
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62 /// The OnPropertyChanged event handler.
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63 /// </summary>
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64 /// <remarks>
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65 /// Records how many times the monitored property name has changed.
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66 /// </remarks>
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67 private void OnPropertyChanged(object sender, PropertyChangedEventArgs eventArgs)
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68 {
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69 // If PropertyName is null or string.Empty then it's the 'all properties' changed event.
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70 RecordPropertyChanged(string.IsNullOrEmpty(eventArgs.PropertyName) ? string.Empty : eventArgs.PropertyName);
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71 }
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72
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73 /// <summary>
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74 /// Releases unmanaged and - optionally - managed resources
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75 /// </summary>
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76 /// <param name = "disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
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77 protected override void Dispose(bool disposing)
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78 {
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79 if (null != _model)
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80 {
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81 var model = _model;
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82 _model = null;
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83 model.PropertyChanged -= OnPropertyChanged;
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84 }
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85 }
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86
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87 /// <summary>
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88 /// Traces the event counts.
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89 /// </summary>
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90 [Conditional("DEBUG")]
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91 public void TraceEventCounts()
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92 {
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93 foreach (var pair in _raisedCounts)
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94 {
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95 string name = string.IsNullOrEmpty(pair.Key) ? "all properties" : pair.Key;
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96 int value = pair.Value;
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97
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98 Debug.WriteLine(string.Format(
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99 CultureInfo.InvariantCulture, @"Property '{0}' raised {1} times.", name, value));
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100 }
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101 }
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102 }
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103 }