如何检索自定义C#资源类常量的字符串值？

public class DateRangeAttribute : ValidationAttribute, IClientValidatable {
  public DateTime MinimumDate = new DateTime(1901, 1, 1);
  public DateTime MaximumDate = new DateTime(2099, 12, 31);

   public DateRangeAttribute(string minDate, string maxDate, string errorMessage) {
     MinimumDate = DateTime.Parse(minDate);
     MaximumDate = DateTime.Parse(maxDate);
     ErrorMessage = string.Format(errorMessage, MinimumDate.ToString("MM/dd/yyyy"), MaximumDate.ToString("MM/dd/yyyy"));
   }
}

我想在我的MVC4视图模型中使用如下：

[DateRange(Resources.MinimumDate, Resources.MaximumDate, "Please enter a date between {0} and {1}")]

Resources是基于存储在SQL数据库中的一组选项生成的资源类.上述两个资源属性的生成代码的简化版本是：

public class Resources {
  public const string MinimumDate = "PropMinimumDate";
  public static string PropMinimumDate
  {
     get { return "12/15/2010" } 
  }
  public const string MaximumDate = "PropMaximumDate";
  public static string PropMaximumDate
  {
     get { return "12/15/2012" } 
  }
}

虽然我不明白它是如何工作的,但我确实理解ValidationAttributes中资源的典型使用会自动将Resources.MinimumDate映射到PropMinimumDate并返回值“12/15/2010”.

我无法弄清楚的是如何自己手动进行程序化跳跃,以便我可以将两个日期值传递到我的自定义ValidatorAttribute中.如目前编码,“PropMinimumDate”和“PropMaximumDate”是传递到DateRangeAttribute的构造函数中的minDate和maxDate参数值(分别).

如果我试试

[DateRange(Resources.PropMinimumDate, Resources.PropMaximumDate, "Please enter a date between {0} and {1}")]

我收到编译错误：

属性参数必须是属性参数类型的常量表达式,typeof表达式或数组创建表达式

有没有办法完成这项任务,还是我尝试了不可能的事情？

public class DateRangeAttribute : ValidationAttribute, IClientValidatable {
  public DateTime MinimumDate = new DateTime(1901, 1, 1);
  public DateTime MaximumDate = new DateTime(2099, 12, 31);
  private Type _resourceType;

   public DateRangeAttribute(string minDate, string maxDate, string errorMessage, Type resourceType) {
     _resourceType = resourceType;
     var minDateProp = _resourceType.GetProperty(minDate, 
                             BindingFlags.Static | BindingFlags.Public);
     var minDateValue = (string) minDateProp.GetValue((object) null, (object[]) null));
     MinimumDate = DateTime.Parse(minDateValue);

     // similarly get the value for MaxDate

     ErrorMessage = string.Format(errorMessage, 
            MinimumDate.ToString("MM/dd/yyyy"), MaximumDate.ToString("MM/dd/yyyy"));         
   }
}

例如

[DateRange(Resources.MinimumDate, Resources.MaximumDate, "Please enter a date between {0} and {1}", typeof(Resources))]