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annotate delete me/SilverlightValidation/ViewModels/ViewModelBase.cs @ 59:3591c26bd63e

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MVVMLight added
author Steven Hollidge <stevenhollidge@hotmail.com>
date Sat, 21 Apr 2012 19:20:28 +0100
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1 using System;
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2 using System.Collections;
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3 using System.Collections.Generic;
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4 using System.ComponentModel;
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5 using System.Linq;
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6
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7 namespace SilverlightValidation.ViewModels
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8 {
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9 public class ViewModelBase : INotifyPropertyChanged, INotifyDataErrorInfo
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10 {
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11 #region INotifyPropertyChanged method plus event
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12
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13 public event PropertyChangedEventHandler PropertyChanged = delegate { };
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14
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15 protected void RaisePropertyChanged(string propertyName)
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16 {
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17 PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
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18 }
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19
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20 #endregion
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21
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22 #region INotifyDataErrorInfo methods and helpers
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23
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24 private readonly Dictionary<string, List<string>> _errors = new Dictionary<string, List<string>>();
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25
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26 public void SetError(string propertyName, string errorMessage)
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27 {
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28 if (!_errors.ContainsKey(propertyName))
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29 _errors.Add(propertyName, new List<string> { errorMessage });
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30
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31 RaiseErrorsChanged(propertyName);
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32 }
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33
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34 protected void ClearError(string propertyName)
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35 {
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36 if (_errors.ContainsKey(propertyName))
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37 {
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38 _errors.Remove(propertyName);
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39 RaiseErrorsChanged(propertyName);
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40 }
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41 }
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42
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43 protected void ClearAllErrors()
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44 {
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45 var errors = _errors.Select(error => error.Key).ToList();
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46
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47 foreach (var propertyName in errors)
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48 ClearError(propertyName);
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49 }
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50
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51 public void RaiseErrorsChanged(string propertyName)
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52 {
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53 ErrorsChanged(this, new DataErrorsChangedEventArgs(propertyName));
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54 }
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55
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56 public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged = delegate { };
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57
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58 public IEnumerable GetErrors(string propertyName)
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59 {
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60 if (propertyName == null) return null;
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61 return _errors.ContainsKey(propertyName)
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62 ? _errors[propertyName]
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63 : null;
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64 }
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65
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66 public bool HasErrors
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67 {
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68 get { return _errors.Count > 0; }
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69 }
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70
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71 #endregion
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72 }
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73 }