目前,我基本上遍历所有ValidationAttribute实例中的每个属性加载并尝试使用Validate / IsValid函数进行验证,但这似乎对我没有用.

作为一个例子,我有一个模型,如：

public class HobbyModel
{
    [required(AllowEmptyStrings = false,ErrorMessage = "Do not allow empty strings")]
    [displayName("Hobby")]
    [DataType(DataType.Text)]
    public string Hobby
    {
        get;
        set;
    }
}

检查属性的代码是：

object[] attributes = propertyInfo.GetCustomAttributes(true);
TypeConverter typeConverter =
TypeDescriptor.GetConverter(typeof(ValidationAttribute));

bool isValid = false;
foreach (object attr in attributes)
{
   ValidationAttribute attrib = attr as ValidationAttribute;

   if (attrib != null)
   {
     attrib.Validate(obj,propertyInfo.Name);
   }
}

我调试了代码,模型确实有3个属性,其中2个是从ValidationAttribute派生的,但是当代码通过Validate函数(带有空值或空值)时,它会按预期抛出异常.

我期待我做一些愚蠢的事情,所以我想知道是否有人使用过这个功能并且可以提供帮助.

提前致谢,
杰米

attrib.Validate(propertyInfo.GetValue(obj,null),propertyInfo.Name);

不过,你肯定会更容易using the Validator class作为Steven suggested.

public class Appointment {
    [required(ErrorMessage="Please enter your name")]
    public string Name { get; set; }

    [required(ErrorMessage="Please enter your appointment date?")] 
    [DataType(DataType.Date,ErrorMessage="Appointment date is not a date")]
    public DateTime AppointmentDate { get; set; }
}

“required”属性遵循ErrorMessage中的值;也就是说,如果我没有输入值,我会收到“请输入”消息.但是,如果我在DateTime字段中输入一个字符串,我收到标准系统错误消息“值’blah’对AppointmentDate无效”.

我通过ASP.NET MVC代码调试,似乎在FormatException的情况下,它没有从propertyMetadata中选择正确的显示名称.不管怎样,或者我遗漏了一些明显的东西：/

有人遇到过这个问题吗？是我,还是只是beta(我使用的是ASP.NET MVC 2 Beta)？

这是项目的一小段摘录(使用DataAnnotations和xVal)：

private List<ErrorInfo> _errors;
        private List<ErrorInfo> Errors
        {
            get
            {
                if (_errors == null)
                    _errors = new List<ErrorInfo>();
                return _errors;
            }
            //set { _errors = value; }
        }

private string _startDateTimeString;

        /// <summary>
        /// A string reprsentation of the StartDateTime,used for validation purposes in the views.
        /// </summary>
        /// <remarks>
        /// If the user passes something like 45/45/80 it would be a valid mm/dd/yy format,but an invalid date,/// which would cause an InvalidOperationException to be thrown by UpdateModel(). By assigning dates to string properties
        /// we can check not only the format,but the actual validity of dates.
        /// </remarks>
        public string StartDateTimeString
        {
            get
            {
                return _startDateTimeString;
            }
            set
            {
                // Check whether the start date passed from the controller is a valid date.
                DateTime startDateTime;
                bool validStartDate = DateTime.TryParse(value,out startDateTime);
                if (validStartDate)
                {
                    StartDateTime = startDateTime;
                }
                else
                {
                    Errors.Add(new ErrorInfo("StartDateTime","Provide a valid date for the start time."));
                }

                _startDateTimeString = value;
            }
        }

        partial void OnValidate(ChangeAction action)
        {
            if (action != ChangeAction.Delete)
            {
                Errors.AddRange(DataAnnotationsValidationRunner.GetErrors(this));

                if (StartDateTimeString != null)
                {
                    DateTime startDateTime;
                    if (!DateTime.TryParse(StartDateTimeString,out startDateTime))
                    {
                        Errors.Add(new ErrorInfo("StartDateTime","Provide a valid date for the start time."));
                    }
                }

                if (Errors.Any())
                    throw new RulesException(Errors);
            }
        }
    }

在我们项目的两个地方进行检查是有意义的,但我只想向您展示一个概念.