今天晕晕糊糊的看CSLA.net，希望能找到验证数据正确性的方法，还是摸索出了INotifyPropertyChanged, IDataErrorInfo接口的使用方法，通过INotifyPropertyChanged实现了响应属性改变的事件，通过 IDataErrorInfo接口实现了在DataGridView或者GridControl中显示验证信息。
先看一个数据实体的抽象类：
1 public abstract class BaseModel : INotifyPropertyChanged, INotifyPropertyChanging, IDataErrorInfo
2 {
3 protected BusinessRules mBusinessRules = new BusinessRules();
4
5 public event PropertyChangedEventHandler PropertyChanged;
6
7 public event PropertyChangingEventHandler PropertyChanging;
8
9 public BaseModel()
10 {
11 mBusinessRules.info = this;
12 AddRule();
13 }
14
15 public virtual void AddRule()
16 {
17
18 }
19
20 protected virtual void PropertyHasChanged(string name)
21 {
22 var propertyNames = mBusinessRules.CheckRules(name);
23
24 foreach (var item in propertyNames)
25 OnPropertyChanged(item);
26 }
27
28 protected virtual void OnPropertyChanged(string propertyName)
29 {
30 if (PropertyChanged != null)
31 PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
32
33 }
34
35 protected virtual void OnPropertyChanging(string propertyName)
36 {
37 if (PropertyChanging != null)
38 PropertyChanging.Invoke(this, new PropertyChangingEventArgs(propertyName));
39
40 }
41
42 #region IDataErrorInfo
43
44 string IDataErrorInfo.Error
45 {
46 get
47 {
48 return "Hello";
49 }
50 }
51
52 string IDataErrorInfo.this[string columnName]
53 {
54 get { return mBusinessRules.GetBrokenRules(columnName); }
55 }
56
57 #endregion
58
59 }
其中的BusinessRules对象mBusinessRules主要负责验证属性的正确性，这里只实现了一个粗糙版本的，没有抽象出验证规则Rule类。
将属性名和验证规则增加到mBusinessRules对象中，通过IDataErrorInfo的IDataErrorInfo.Error属性和IDataErrorInfo.this[string columnName]索引器验证每一列的正确性。Error是行头显示的提示信息。这里用到了lamda表达式和属性的遍历。
1 public class BusinessRules
2 {
3 List<string> names = new List<string>();
4 List<string> exp = new List<string>();
5 public object info;//指向对象本身
6
7 public List<string> CheckRules(string name)
8 {
9 return names;
10 }
11
12 public string GetBrokenRules(string columnName)
13 {
14 for (int i = 0; i < names.Count; i++)
15 {
16 List<object> list = new List<object>();
17 if (info == null) return null;
18 Type t = info.GetType();
19 IEnumerable<System.Reflection.PropertyInfo> property = from pi in t.GetProperties() where pi.Name.ToLower() == columnName.ToLower() select pi;
20 //IEnumerable<System.Reflection.PropertyInfo> property = t.GetProperties();
21 foreach (PropertyInfo prpInfo in property)
22 {
23 string sProName = prpInfo.Name;
24 object obj = prpInfo.GetValue(info, null);
25 if (!Regex.IsMatch(obj.ToString(), exp[i]))
26 {
27 return "Error";
28 }
29 }
30 }
31 return "";
32 }
33
34 public void AddRule(string ColName, string RegexExpress)
35 {
36 names.Add(ColName);
37 exp.Add(RegexExpress);
38 }
39 }
接下来是数据实体Student，继承自BaseModel
1 public class Student : BaseModel
2 {
3 public Student(string name)
4 {
5 mName = name;
6 }
7 private string mName;
8 public string Name
9 {
10 get
11 {
12 return mName;
13 }
14 set
15 {
16 if (mName != value)
17 {
18 mName = value;
19 PropertyHasChanged("Name");
20 }
21 }
22 }
23 public override void AddRule()
24 {
25 mBusinessRules.AddRule("Name", @"^-?\d+$");
26 }
27
28 }
最后是调用和效果：
1 private void button1_Click(object sender, EventArgs e)
2 {
3 BindingList<Student> list = new BindingList<Student>();
4 Student a = new Student("张三");
5 list.Add(a);
6 Student b = new Student("张三三");
7 list.Add(b);
8 gridControl1.DataSource = list;
9 }
图1 初始化程序 图2修改第一行数据后，第一行错误提示消失
行头没有处理，所以一直有提示信息。
补充：类似的介绍 http://blog.csdn.net/t673afa/article/details/6066278
CSLA.Net学习（3）INotifyPropertyChanged和IDataErrorInfo,布布扣,bubuko.com