一、概述

我们利用ValidationRule以及ErrorTemplate来制作一个简单的表单验证。

二、Demo

核心思想：我们在ValidationRule中的Validate函数中进行验证，然后将验证结果存放至一个预先定义好的全局资源中，这样其他控件就可以根据验证结果来进行相应的处理，代码参见以下：

1 using System.ComponentModel;
2 using System.Globalization;
3 using System.Text.RegularExpressions;
4 using System.Windows;
5 using System.Windows.Controls;
6
7 namespace BindingDemo5ValidationRuleDemo
8 {
9 ///

10 /// Interaction logic for MainWindow.xaml 11 ///

12 public partial class MainWindow : Window
13 {
14 private string nickName;
15 public string NickName
16 {
17 get { return nickName; }
18 set { nickName = value; }
19 }
20
21 private string phoneNumber;
22 public string PhoneNumber
23 {
24 get { return phoneNumber; }
25 set { phoneNumber = value; }
26 }
27
28 private string password;
29 public string Password
30 {
31 get { return password; }
32 set { password = value; }
33 }
34
35 private string confirmPassword;
36 public string ConfirmPassword
37 {
38 get { return confirmPassword; }
39 set { confirmPassword = value; }
40 }
41
42 public MainWindow()
43 {
44 InitializeComponent();
45 this.DataContext = this;
46 }
47
48 private void Button_Click(object sender, RoutedEventArgs e)
49 {
50 MessageBox.Show(NickName);
51 }
52 }
53
54 public class ValidationOutput : INotifyPropertyChanged
55 {
56 public event PropertyChangedEventHandler PropertyChanged;
57 public void OnNotifyPropertyChanged(string propertyName)
58 {
59 if (PropertyChanged != null)
60 {
61 PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
62 }
63 }
64
65 private bool isAllValid = true;//Indicate if all elements is valid
66
67 public bool IsAllValid
68 {
69 get { return isAllValid; }
70 set { isAllValid = value;
71 OnNotifyPropertyChanged("IsAllValid");
72 }
73 }
74
75
76 private string errorMsg4NickName;
77 public string ErrorMsg4NickName
78 {
79 get { return errorMsg4NickName; }
80 set
81 {
82 errorMsg4NickName = value;
83 OnNotifyPropertyChanged("ErrorMsg4NickName");
84 }
85 }
86
87 private bool isShow4NickName;
88 public bool IsShow4NickName
89 {
90 get { return isShow4NickName; }
91 set
92 {
93 isShow4NickName = value;
94 OnNotifyPropertyChanged("IsShow4NickName");
95 }
96 }
97
98
99 private string errorMsg4PhoneNumber;
100 public string ErrorMsg4PhoneNumber
101 {
102 get { return errorMsg4PhoneNumber; }
103 set
104 {
105 errorMsg4PhoneNumber = value;
106 OnNotifyPropertyChanged("ErrorMsg4PhoneNumber");
107 }
108 }
109
110 private bool isShow4PhoneNumber;
111 public bool IsShow4PhoneNumber
112 {
113 get { return isShow4PhoneNumber; }
114 set
115 {
116 isShow4PhoneNumber = value;
117 OnNotifyPropertyChanged("IsShow4PhoneNumber");
118 }
119 }
120
121 private bool isPhoneNumberValid;
122 public bool IsPhoneNumberValid
123 {
124 get { return isPhoneNumberValid; }
125 set
126 {
127 isPhoneNumberValid = value;
128 OnNotifyPropertyChanged("IsPhoneNumberValid");
129 }
130 }
131
132 private bool isNickNameValid;
133 public bool IsNickNameValid
134 {
135 get { return isNickNameValid; }
136 set
137 {
138 isNickNameValid = value;
139 OnNotifyPropertyChanged("IsNickNameValid");
140 }
141 }
142
143
144
145 private string errorMsg4Password;
146 public string ErrorMsg4Password
147 {
148 get { return errorMsg4Password; }
149 set
150 {
151 errorMsg4Password = value;
152 OnNotifyPropertyChanged("ErrorMsg4Password");
153 }
154 }
155
156 private bool isPasswordValid;
157 public bool IsPasswordValid
158 {
159 get { return isPasswordValid; }
160 set
161 {
162 isPasswordValid = value;
163 OnNotifyPropertyChanged("IsPasswordValid");
164 }
165 }
166
167 private string password;
168 public string Password
169 {
170 get { return password; }
171 set
172 {
173 password = value;
174 OnNotifyPropertyChanged("Password");
175 }
176 }
177
178
179 private string errorMsg4ConfirmPassword;
180 public string ErrorMsg4ConfirmPassword
181 {
182 get { return errorMsg4ConfirmPassword; }
183 set
184 {
185 errorMsg4ConfirmPassword = value;
186 OnNotifyPropertyChanged("ErrorMsg4ConfirmPassword");
187 }
188 }
189
190 private bool isConfirmPasswordValid;
191 public bool IsConfirmPasswordValid
192 {
193 get { return isConfirmPasswordValid; }
194 set
195 {
196 isConfirmPasswordValid = value;
197 OnNotifyPropertyChanged("IsConfirmPasswordValid");
198 }
199 }
200
201
202 }
203
204 public class RegisterValidationRule : ValidationRule
205 {
206 private ValidationOutput validationOutput = null;
207 public ValidationOutput ValidationOutput
208 {
209 get { return validationOutput; }
210 set { validationOutput = value; }
211 }
212 private string validateType;
213
214 public string ValidateType
215 {
216 get { return validateType; }
217 set { validateType = value; }
218 }
219
220 public bool IsLegalPhoneNumber(string phoneNumber)
221 {
222 return Regex.IsMatch(phoneNumber, @"^1[3578]\d{9}$");
223 }
224 public override ValidationResult Validate(object value, CultureInfo cultureInfo)
225 {
226 if (ValidateType == "NickName")
227 {
228 string s = (string)value;
229 if (s.Length < 6)
230 {
231 ValidationOutput.IsNickNameValid = false;
232 ValidationOutput.IsAllValid = false;
233 ValidationOutput.ErrorMsg4NickName = "Length should be longger than 6 characters";
234 return new ValidationResult(false, "Length should be longger than 6 characters");
235 }
236 else
237 {
238 ValidationOutput.IsNickNameValid = true;
239 ValidationOutput.IsAllValid = true;
240 return new ValidationResult(true, null);
241 }
242
243 }
244 else if(ValidateType == "PhoneNumber")
245 {
246 string s = (string)value;
247 if (!IsLegalPhoneNumber(s))
248 {
249 //ValidationOutput.IsShow4PhoneNumber = true;
250 ValidationOutput.IsPhoneNumberValid = false;
251 ValidationOutput.IsAllValid = false;
252 ValidationOutput.ErrorMsg4PhoneNumber = "Phone number format is not correct";
253 return new ValidationResult(false, "Phone number format is not correct");
254 }
255 else
256 {
257 ValidationOutput.IsShow4PhoneNumber = false;
258 ValidationOutput.IsPhoneNumberValid = true;
259 ValidationOutput.IsAllValid = true;
260 return new ValidationResult(true, null);
261 }
262 }
263 else if (ValidateType == "Password")
264 {
265 string myPassword = (string)value;
266 ValidationOutput.Password = myPassword;//Store the password in a global resource, used for validating the confirm password
267 if (myPassword.Length < 8)
268 {
269 ValidationOutput.IsPasswordValid = false;
270 ValidationOutput.IsAllValid = false;
271 ValidationOutput.ErrorMsg4Password = "Password length should be longger than 8 characters";
272 return new ValidationResult(false, "Password length should be longger than 8 characters");
273 }
274 else
275 {
276 ValidationOutput.IsPasswordValid = true;
277 ValidationOutput.IsAllValid = true;
278 return new ValidationResult(true, null);
279 }
280 }
281 else if (ValidateType == "ConfirmPassword")
282 {
283 string myConfirmPassword = (string)value;
284 string myPassword = ValidationOutput.Password;
285 if (myPassword != myConfirmPassword)
286 {
287 ValidationOutput.IsConfirmPasswordValid = false;
288 ValidationOutput.IsAllValid = false;
289 ValidationOutput.ErrorMsg4ConfirmPassword = "Password are not the same";
290 return new ValidationResult(false, "Password are not the same");
291 }
292 else
293 {
294 ValidationOutput.IsConfirmPasswordValid = true;
295 ValidationOutput.IsAllValid = true;
296 return new ValidationResult(true, null);
297 }
298 }
299 return new ValidationResult(true, null);
300
301 }
302
303 }
304 }

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运行结果以下：