System.DateTime的？到system.datetime [英] System.datetime? To system.datetime

问题描述

我收到一条说System.datetime的错误？无法转换为System.datetime，但存在显式转换。我做了谷歌搜索并找到了一个建议的解决方案......但我仍然得到错误。 OPT_EXP是一个可以为空的列。请看一看并告诉我出了什么问题？



我尝试了什么：

I'm getting an error saying System.datetime? can't be converted to System.datetime, but an explicit conversion exists. I did a Google search and found a proposed solution... but I still get the error. OPT_EXP is a nullable column. Please take a look and show me what's wrong?

What I have tried:

       public class MC_VARIABLES
       {
           public DateTime? OPT_EXP;
           public DateTime? mOPT_EXP
           {
               get { return mOPT_EXP; }
               set { mOPT_EXP = value; }
           }
       }

public void DTE()
   {
       decimal DTE;

       foreach (KeyValuePair<int,> KVP in dctMC)
       {
           if (KVP.Value.OPT_EXP.HasValue)
           {
               DateTime TDY = DateTime.Now;
               DateTime EXP = KVP.Value.OPT_EXP;           //cannot implicitly convert system.datetime? to system.datetime....not sure how to fix this
               TimeSpan DaysToExp = TDY - EXP;
               DTE = (decimal)(DaysToExp.TotalDays) / 365;
           }
       }
   }

推荐答案

使用：

Use:

DateTime EXP = KVP.Value.OPT_EXP.Value;

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