(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;
    }
}

(5)前端控件指定