使用数据标签验证属性，control不用劳什子一一手工指定验证，在model binding期间，所有标记属性会自动启用验证，并把不合法信息登记进ModelState。View不需要任何变化。默认，asp.net mvc注册使用DataAnnotationsModelValidationFactory，
它能识别的标签包括： [Range],[RegularExpression],[Required],[StringLength]。
示例：
public class Appointment
{
[Required(ErrorMessage = "Please enter your name")]
[StringLength(50)]
public string ClientName { get; set; }
[DataType(DataType.Date)]
[Required(ErrorMessage = "Please choose a date")]
public DateTime AppointmentDate { get; set; }
[RegularExpression(@"(\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*\w\w)", ErrorMessage = "输入的邮箱地址不合法")]
public string email { set; get; }
}
可以创建自己的Data Annotations Validation Attribute
public class ValidEmailAddressAttribute : ValidationAttribute
{
public ValidEmailAddressAttribute()
{
// Default message unless declared on the attribute
ErrorMessage = "{0} must be a valid email address.";
}
public override bool IsValid(object value)
{
// You might want to enhance this logic...
string stringValue = value as string;
if (stringValue != null)
return stringValue.Contains("@");
return true;
}
}
public class Appointment
{
[Required(ErrorMessage = "Please enter your name")] [StringLength(50)]
public string ClientName { get; set; }
[DataType(DataType.Date)] [Required(ErrorMessage = "Please choose a date")]
public DateTime AppointmentDate { get; set; }
[ValidEmailAddress]
public String Email { get; set; }
}