如何使用 EF Core 加载导航属性? [英] How to load the navigation property with EF Core?

问题描述

在 EF6 中我们有这样的选项:

In EF6 we had such option:

context.Set<TEntity>().Attach(entity);
context.Entry(entity).Collection("NavigationProperty").Load();

由于 EF Core100% 严格输入"，因此他们删除了 Collection 功能.但是应该用什么来代替呢?

Since EF Core "goes 100% strictly typed" they have removed Collection function. But what should be used instead?

补充:我的意思是如何为 ATTACHED 实体加载包含/导航集合属性"?

Added: I mean how to load includes/"navigation collection properties" for ATTACHED entity?

推荐答案

Entity Framework Core v1.1 中添加了显式加载.请参阅 Microsoft Docs

Explicit Loading was added in Entity Framework Core v1.1. See Microsoft Docs

来自文档:

using (var context = new BloggingContext())
{
    var blog = context.Blogs
    .Single(b => b.BlogId == 1);

    context.Entry(blog)
        .Collection(b => b.Posts)
        .Load();

    context.Entry(blog)
        .Reference(b => b.Owner)
        .Load();
}

这篇关于如何使用 EF Core 加载导航属性?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！