entity-framework - EF Core Second level ThenInclude misworks

Question

假设首先拥有这些模型:
Method有一个 OriginalCodeOriginalCode有很多Mutant秒Mutant有很多ParseSubTree秒

现在在 Method 上查询时我想要另一个被加载。所以我有以下几点:

Method targetMethod = dBContext.Methods
            .Include(me => me.OriginalCode)
                .ThenInclude(oc => oc.Mutants)
            .FirstOrDefault(me => me.Id == id);

下一步是额外包含 ParseSubTree .但问题是我无法访问它。见下图:



问题是“mu 是一个列表而不是一个对象引用”!

我的错在哪里!

TG。

Answer 1

这是 ThenInclude 的已知 Intellisense 问题集合类型导航属性的重载，由 Completion missing members of lambda parameter in fault tolerance case #8237 跟踪Roslyn GitHub 问题。

在它得到修复之前，只需键入属性的名称，它就会成功编译并按预期工作。

.ThenInclude(mu => mu.ParseSubTrees) 

更新:现在它甚至在 Including multiple levels 中特别提到EF Core 文档的部分:

Note

Current versions of Visual Studio offer incorrect code completion options and can cause correct expressions to be flagged with syntax errors when using the ThenInclude method after a collection navigation property. This is a symptom of an IntelliSense bug tracked at https://github.com/dotnet/roslyn/issues/8237. It is safe to ignore these spurious syntax errors as long as the code is correct and can be compiled successfully.