wpf验证方法总结
2008-08-24 01:45 Clingingboy 阅读(3930) 评论(1) 编辑 收藏 举报一.两步实现验证
(1)实现INotifyPropertyChanged接口,并为验证的属性添加需要验证的元数据
[StringLengthValidator(1, 10, MessageTemplate = "First Name must be between 1 and 15 characters")] public string FirstName { get { return this.firstName; } set { this.firstName = value; this.OnPropertyChanged("FirstName"); } }
(2)在前端使用Validizor控件,为后端验证显示错误
<Validizor Source="{Binding FirstName}"/> <TextBox Text="{Binding FirstName,UpdateSourceTrigger=PropertyChanged}"/>
二.使用EnterpriseLibrary验证组
(1)指定元数据Ruleset属性
[StringLengthValidator(1, 20, MessageTemplate = "Last Name must be between 1 and 20 characters", Ruleset = "Default")] public string LastName { get { return this.lastName; } set { this.lastName = value; this.OnPropertyChanged("LastName"); } }
(2)前端控件同时指定Ruleset属性
<Validizor Source="{Binding LastName}" Ruleset="Default">
三.wpf内置验证的缺陷
(1)ui错误无法变更,验证的不仅仅只是TextBox(3.5 sp1 可以把错误信息转嫁)
wpf内置验证的做法,自定义ValidationRule
(2)若使用了内置验证做法,控件的验证将会失效
四.两个属性以上的验证
(1)单一的元数据标签无法做到,需要写额外的方法进行验证
(2)使用HasSelfValidation元数据标签验证对象
[HasSelfValidation] public class Person2 : INotifyPropertyChanged { }
(3)添加验证方法
[SelfValidation(Ruleset = "Default")] public void ValidateDefault(ValidationResults results) { }
(4)针对特定属性来验证
(4)-1 实行IPropertyChangedName接口,根据进来的属性进行判断,可以填写多个方法用于区分
[SelfValidation(Ruleset = "Default")] public void ValidateDefault(ValidationResults results) { switch (this.PropertyChangedName) { case "FirstName": break; } }
[SelfValidation(Ruleset = "Default")] public void ValidateDefault(ValidationResults results) { switch (this.PropertyChangedName) { case "LastName": break; } }