1 // 这个类是进行数据验证的
 2 public class LoginMultiBinding : IMultiValueConverter
 3     {
 4         #region IMultiValueConverter メンバー
 5 
 6         public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
 7         {
 8             if (!values.Cast<string>().Any(text => string.IsNullOrEmpty(text)))
 9             {
10                 return true;
11             }
12             return false;
13         }
14 
15         public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
16         {
17             throw new NotImplementedException();
18         }
19 
20         #endregion
21     }
22 
23 
24 // 这是登陆界面的后台。
25 public Login()
26         {
27             InitializeComponent();
28             this.SetConstraint();
29         }
30 
31         /// <summary>
32         /// 设置约束条件
33         /// </summary>
34         private void SetConstraint() 
35         {
36             Binding bind1 = new Binding("Text") { Source = txtUserName };
37             Binding bind2 = new Binding("Password") { Source = txtUserPwd }; 
38 
39             MultiBinding mulBind = new MultiBinding() { Mode = BindingMode.OneWay };
40             mulBind.Bindings.Add(bind1);
41             mulBind.Bindings.Add(bind2);
42             mulBind.Converter = new LoginMultiBinding();
43             this.btnLogin.SetBinding(Button.IsEnabledProperty, mulBind);
44         }