c# - How to check if ObjectResult<> contains a value

Question

How do I check to see if the ObjectResult<> has a value or not? Right now it's returning values but will it throw an exception is there is nothing to return?

This is the section of code that I need to check so I do not have to depend on a try catch block

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iProjInfo.ProjectLeafs = db.proc_GetProjectLeafs(projectID).ToList<IProjectLeafs>();

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public static Task<IProjectInfo> GetProjectInfo(int projectID)
{
    return Task.Run(() =>
      {
          using (var db = new StorefrontSystemEntities())
          {
              IProjectInfo iProjInfo = db.proc_GetProject_ForDrawings(projectID).Single<IProjectInfo>();

              try
              {
                  iProjInfo.ProjectLeafs = db.proc_GetProjectLeafs(projectID).ToList<IProjectLeafs>();
              }
              catch (Exception ex)
              {

              }
              return iProjInfo;
          };
      });
}

Answer 1

只要存储过程正在执行并返回结果集；即使它是空的（存储过程没有返回记录），您也可以确定返回的是一个空列表。