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annotate SilverlightGlimpse/SilverlightValidation/ViewModels/ViewModelBase.cs @ 69:a0bcd783e612

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author Steven Hollidge <stevenhollidge@hotmail.com>
date Mon, 23 Apr 2012 11:06:10 +0100
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children 96e6fbd70f49
rev   line source
69
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1 using System;
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2 using System.Collections;
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3 using System.ComponentModel;
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4 using System.Linq;
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5
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6 namespace SilverlightValidation.ViewModels
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7 {
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8 public class ViewModelBase : INotifyPropertyChanged, INotifyDataErrorInfo
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9 {
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10 #region INotifyPropertyChanged method plus event
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11
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12 public event PropertyChangedEventHandler PropertyChanged = delegate { };
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13
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14 protected void RaisePropertyChanged(string propertyName)
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15 {
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16 PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
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17 }
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18
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19 #endregion
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20
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21 #region INotifyDataErrorInfo methods and helpers
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22
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23 private readonly Dictionary<string, List<string>> _errors = new Dictionary<string, List<string>>();
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24
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25 public void SetError(string propertyName, string errorMessage)
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26 {
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27 if (!_errors.ContainsKey(propertyName))
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28 _errors.Add(propertyName, new List<string> { errorMessage });
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29
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30 RaiseErrorsChanged(propertyName);
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31 }
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32
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33 protected void ClearError(string propertyName)
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34 {
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35 if (_errors.ContainsKey(propertyName))
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36 {
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37 _errors.Remove(propertyName);
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38 RaiseErrorsChanged(propertyName);
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39 }
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40 }
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41
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42 protected void ClearAllErrors()
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43 {
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44 var errors = _errors.Select(error => error.Key).ToList();
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45
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46 foreach (var propertyName in errors)
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47 ClearError(propertyName);
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48 }
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49
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50 public void RaiseErrorsChanged(string propertyName)
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51 {
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52 ErrorsChanged(this, new DataErrorsChangedEventArgs(propertyName));
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53 }
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54
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55 public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged = delegate { };
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56
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57 public IEnumerable GetErrors(string propertyName)
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58 {
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59 if (propertyName == null) return null;
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60 return _errors.ContainsKey(propertyName)
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61 ? _errors[propertyName]
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62 : null;
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63 }
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64
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65 public bool HasErrors
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66 {
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67 get { return _errors.Count > 0; }
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68 }
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69
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70 #endregion
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71 }
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72 }