1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
public class ValidationViewModel<TModel> : INotifyPropertyChanged, INotifyDataErrorInfo
where TModel : WCFContract
{
#region Fields
private readonly List<PropertyValidation<TModel>> _validations = new List<PropertyValidation<TModel>>();
private Dictionary<string, List<string>> _errorMessages = new Dictionary<string, List<string>>();
private TModel _model;
#endregion
public TModel Model
{
get { return _model; }
set { SetModel(value); }
}
private void SetModel(TModel value)
{
if (value != null)
{
CreateValidation(value.Rules);
if(_model != value)
{
_model = value;
//On s'abonne au PropertyCHanged de tous les descendant
NotifyPropertyChangedHelper.SetupPropertyChanged(_model, (s, e) => { ValidateProperty(s, e.PropertyName); });
OnPropertyChanged("Model")
}
}
}
protected ValidationViewModel()
{
PropertyChanged += (s, e) => { if (e.PropertyName != "HasErrors") ValidateProperty(s, e.PropertyName); };
}
private void CreateValidation(ObservableCollection<Rule> rules)
{
if (rules == null || rules.Count == 0)
return;
ValidationBase<TModel> valid = null;
foreach (var rule in rules)
{
var validation = AddValidationFor(rule.PropertyName);
switch (rule.ValidationType)
{
case ValidationType.String:
var sr = rule as StringRule;
if (sr != null)
{
valid = new StringValidation<TModel>(sr.MinLength, sr.MaxLength);
valid.PropertyName = rule.PropertyName;
validation.When(valid.GetCompareFunction())
.Show(sr.Message);
}
break;
}
}
}
#region INotifyDataErrorInfo
public IEnumerable GetErrors(string propertyName)
{
if (_errorMessages.ContainsKey(propertyName))
return _errorMessages[propertyName];
return new string[0];
}
public bool HasErrors
{
get { return _errorMessages.Count > 0; }
}
public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged = delegate { };
private void OnErrorsChanged(string propertyName)
{
ErrorsChanged(this, new DataErrorsChangedEventArgs(propertyName));
}
#endregion
protected PropertyValidation<TModel> AddValidationFor(Expression<Func<object>> expression)
{
return AddValidationFor(ExpressionHelper.GetPropertyName(expression));
}
protected PropertyValidation<TModel> AddValidationFor(string propertyName)
{
var validation = new PropertyValidation<TModel>(propertyName);
_validations.Add(validation);
return validation;
}
protected void AddAllAttributeValidators()
{
PropertyInfo[] propertyInfos = GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
foreach (PropertyInfo propertyInfo in propertyInfos)
{
Attribute[] custom = Attribute.GetCustomAttributes(propertyInfo, typeof(ValidationAttribute), true);
foreach (var attribute in custom)
{
var property = propertyInfo;
var validationAttribute = attribute as ValidationAttribute;
if (validationAttribute == null)
throw new NotSupportedException("validationAttribute variable should be inherited from ValidationAttribute type");
string name = property.Name;
var displayAttribute = Attribute.GetCustomAttributes(propertyInfo, typeof(DisplayAttribute)).FirstOrDefault() as DisplayAttribute;
if (displayAttribute != null)
{
name = displayAttribute.GetName();
}
var message = validationAttribute.FormatErrorMessage(name);
AddValidationFor(propertyInfo.Name)
.When(x =>
{
var value = property.GetGetMethod().Invoke(this, new object[] { });
var result = validationAttribute.GetValidationResult(value,
new ValidationContext(this, null, null) { MemberName = property.Name });
return result != ValidationResult.Success;
})
.Show(message);
}
}
}
public void ValidateAll()
{
var propertyNamesWithValidationErrors = _errorMessages.Keys;
_errorMessages = new Dictionary<string, List<string>>();
_validations.ForEach(PerformValidation);
var propertyNamesThatMightHaveChangedValidation =
_errorMessages.Keys.Union(propertyNamesWithValidationErrors).ToList();
propertyNamesThatMightHaveChangedValidation.ForEach(OnErrorsChanged);
OnPropertyChanged("HasErrors");
}
public void ValidateProperty(object sender, Expression<Func<object>> expression)
{
ValidateProperty(sender, ExpressionHelper.GetPropertyName(expression));
}
private void ValidateProperty(object sender, string propertyName)
{
_errorMessages.Remove(propertyName);
_validations.Where(v => v.PropertyName == propertyName).ToList().ForEach(PerformValidation);
OnErrorsChanged(propertyName);
OnPropertyChanged("HasErrors");
}
private void PerformValidation(PropertyValidation<TModel> validation)
{
if (validation.IsInvalid((TModel)this.Model))
{
AddErrorMessageForProperty(validation.PropertyName, validation.GetErrorMessage());
}
}
private void AddErrorMessageForProperty(string propertyName, string errorMessage)
{
if (_errorMessages.ContainsKey(propertyName))
{
_errorMessages[propertyName].Add(errorMessage);
}
else
{
_errorMessages.Add(propertyName, new List<string> { errorMessage });
}
}
#region INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged.UISafeInvoke(this, new PropertyChangedEventArgs(propertyName));
}
#endregion
} |
