一个列表的更改如何影响完全不同的列表？
我有以下代码：
jobsToShiftUp.AddRange(PresentationManager.Instance.ScheduleViewSource.Where(o => o.Resources.First().ResourceName == criticalJob.Resources.First().ResourceName && ((o.Start >= criticalJob.Start) || (o.Start < criticalJob.Start && o.End > criticalJob.Start)) && !o.JobGuid.Equals(((Job)state.DraggedAppointments.First()).JobGuid) && GetWeekNumber(o.Start) == GetWeekNumber(criticalJob.Start)));
jobsToShiftUp = jobsToShiftUp.OrderBy(o => o.Start).ToList();
TimeSpan timeToShift = criticalJob.End - jobsToShiftUp.First().Start;
foreach (Job job in jobsToShiftUp)
{
if (jobsToShiftUp.IndexOf(job) == 0)
{
((ObservableCollection<Job>)state.DestinationAppointmentsSource).Single(o => o.JobGuid.Equals(job.JobGuid)).Start += timeToShift;
((ObservableCollection<Job>)state.DestinationAppointmentsSource).Single(o => o.JobGuid.Equals(job.JobGuid)).End += timeToShift;
......
最后两行（增加作业的开始和结束属性）同时影响 state.destinationappointmentssource 列表和 jobsToShiftUp 列表（即，它影响当前在foreach 循环）。我根本无法想象为什么它会影响 jobsToShiftUp 列表！？
I have the following code:
jobsToShiftUp.AddRange(PresentationManager.Instance.ScheduleViewSource.Where(o => o.Resources.First().ResourceName == criticalJob.Resources.First().ResourceName && ((o.Start >= criticalJob.Start) || (o.Start < criticalJob.Start && o.End > criticalJob.Start)) && !o.JobGuid.Equals(((Job)state.DraggedAppointments.First()).JobGuid) && GetWeekNumber(o.Start) == GetWeekNumber(criticalJob.Start)));
jobsToShiftUp = jobsToShiftUp.OrderBy(o => o.Start).ToList();
TimeSpan timeToShift = criticalJob.End - jobsToShiftUp.First().Start;
foreach (Job job in jobsToShiftUp)
{
if (jobsToShiftUp.IndexOf(job) == 0)
{
((ObservableCollection<Job>)state.DestinationAppointmentsSource).Single(o => o.JobGuid.Equals(job.JobGuid)).Start += timeToShift;
((ObservableCollection<Job>)state.DestinationAppointmentsSource).Single(o => o.JobGuid.Equals(job.JobGuid)).End += timeToShift;
......
The last two lines (increasing the start and end properties of the jobs) affects both the state.destinationappointmentssource list AND the jobsToShiftUp list (i.e. it affects the job object currently being referenced in the foreach loop). I can't think why it would affect the jobsToShiftUp list at all!?
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由于两个列表都包含相同的对象实例。
例如：
list[0].Start+=10会将 10 添加到job中，该作业也被list2引用Since both list contain the same instances of objects.
Like:
list[0].Start+=10will add 10 tojobwhich is also referenced bylist2我认为这两个对象具有相同的引用。
因此，jobsToShiftUp 集合和 state.DestinationAppointmentsSource 可能都具有一些相同的引用，并更新反映在另一个引用中的引用。
您可以使用克隆（深复制）来避免这种情况。
I think both object have same reference.
So
jobsToShiftUpcollection andstate.DestinationAppointmentsSourcemight both have some same reference and updating the one reflecting in another.You can use cloning (deep copy) to avoid this .