In the following code snippet I'm placing a brakpoint at the return of the select.

在下面的代碼片段中，我在select的返回時放置了一個brakpoint。

In this case the breakpoint is being hit correctly

在這種情況下，正確地命中斷點

                         context.campaigns
                         .Include("adgroups")
                         .Include("campaigntimeranges")
                         .ToList()
                         .Where(p=> p.LastUpdate < fromDate && 
                                    p.campaigntimeranges.OrderByDescending(q => q.EntryDate).FirstOrDefault().DateStart >= fromDate && 
                                    p.campaigntimeranges.OrderByDescending(q => q.EntryDate).FirstOrDefault().DateStart <= currentDate
                               )
                         .ToList().Select(x => { 
                             return x; //Breakpoint here
                         }).ToList();

In that case the (.ToList() is removed) the breakpointis never hit

在這種情況下（.ToList（）被刪除）斷點永遠不會被擊中

                         context.campaigns
                         .Include("adgroups")
                         .Include("campaigntimeranges")
                         .Where(p=> p.LastUpdate < fromDate && 
                                    p.campaigntimeranges.OrderByDescending(q => q.EntryDate).FirstOrDefault().DateStart >= fromDate && 
                                    p.campaigntimeranges.OrderByDescending(q => q.EntryDate).FirstOrDefault().DateStart <= currentDate
                               )
                         .ToList().Select(x => { 
                             return x; //Breakpoint here
                         }).ToList();

I wish I could use the first, working example however anything after the .ToList() is not loaded into context so the first one results in a collection of all "campaigns".

我希望我可以使用第一個工作示例但是.ToList（）之后沒有加載到上下文中，所以第一個導致所有“廣告系列”的集合。

Why is that and how can I fix that?

為什么這樣，我該如何解決？

Thanks

謝謝

1 个解决方案

context.campaigns.Where(/*condition*/).Select(/*selector*/); // returns IQueryable<T>
// IQueryable is translated into a SQL statement

var campaigns = context.campaigns.Where(/*condition*/).ToList(); // Returns List<T>
campaign.Select(/*selector*/); // campaign is a List<T>, and Select is not not translated to SQL, but executed directly