Question

我有一个带有计算参数的类：

public class Job
{
    public Job()
    {            
        Reports = new List<Report>();
    }

    [Key]
    public int JobID { get; set; }

    public ICollection<Report> Reports { get; set; }
    public DateTime AppointmentDate { get; set; }

    public decimal AverageReportTurnaround
    {
        get
        {
            DateTime reportdate = Reports.Select(x=>x.DateCompleted).FirstOrDefault();

            return (reportdate - AppointmentDate).Value.Days;

        }
    }

如何将datefrom字段传递给构造函数，以便它只计算reportdate为＆gt;的AverageReportTurnaround。 datefrom？

Answer 1

您可以使用私人字段

public class Job
{
    private DateTime fromDate;

    public Job(DateTime fromDate)
    {             
        Reports = new List<Report>();
        this.fromDate = fromDate;
    }
    ...
    public decimal AverageReportTurnaround
    {
        get
        {
            DateTime reportdate = Reports.Where(x => x.DateCompleted > this.fromDate)
                .Select(x=> x.DateCompleted).FirstOrDefault();
            return (reportdate - AppointmentDate).Value.Days;

        }
    }
}

Answer 2

你可以这样做：

public class Job
{
public Job(DateTime dateFrom)
{            
    Reports = new List<Report>();
    DateFrom = dateFrom;
}

[Key]
public int JobID { get; set; }

public ICollection<Report> Reports { get; set; }
public DateTime AppointmentDate { get; set; }
public DateTime DateFrom { get; private set; }

public decimal AverageReportTurnaround
{
    get
    {
        DateTime reportdate = Reports.Where(x => x.ReportDate > DateFrom).Select(x=>x.DateCompleted).FirstOrDefault();

        return (reportdate - AppointmentDate).Value.Days;

    }
}

但是，如果您在EntityFramework中使用此类（根据＆＃39; Key＆＃39;属性判断），则应将AverageReportTurnaround转换为使用dateFrom作为参数的方法

将参数传递给getter / setter

2 个答案: