c#向属性添加逻辑

Question

I have a model with two properties:

public class AlertRequest
{
   public DateTime? FromDate { get; set; }
   public DateTime? ToDate { get; set; }
}

I need to add check for these props

• FromDate : when null then set as Datetime.MinValue ;
• ToDate : when null then set as Datetime.MaxValue ;

How to implement this in C# ?

Answer 1

You can implement the properties manually :

public class AlertRequest
{
   private DateTime? m_FromDate = DateTime.MinValue;
   private DateTime? m_ToDate = DateTime.MaxValue;

   public DateTime? FromDate { 
     get {
       return m_FromDate;
     }
     set {
       m_FromDate = value ?? DateTime.MinValue;
     } 
   }

   public DateTime? ToDate { 
     get {
       return m_ToDate;
     }
     set {
       m_ToDate = value ?? DateTime.MaxValue;
     } 
   }
}

Now we can put

AlertRequest request = new AlertRequest();

request.ToDate = null;

// 9999-12-31 (Max Date)
Console.Write(request.ToDate.ToString("yyyy-MM-dd"));