// 引用 using Microsoft.EntityFrameworkCore; // 摘要: // Specifies related entities to include in the query results. The navigation property // to be included is specified starting with the type of entity being queried (TEntity). // Further navigation properties to be included can be ...
Before 3.0, eagerly loading collection navigations via Include operators caused multiple queries to be generated on relational database, one for each related entity type.New behaviorStarting with 3.0, EF Core generates a single query with JOINs on relational databases....
Before 3.0, eagerly loading collection navigations via Include operators caused multiple queries to be generated on relational database, one for each related entity type.New behaviorStarting with 3.0, EF Core generates a single query with JOINs on relational databases....
這表示 EF Core 不會嘗試使用 明確載入或 延遲載入 重新載入其值,即使某些元素可能仍然遺失。衍生類型中的 Include您可以使用 和 ThenInclude ,只包含衍生型 Include 別上定義的導覽相關資料。假設有下列模型:C# 複製 public class SchoolContext : DbContext { public DbSet<Person> People { get; set; } ...
In the context of a inherited entities, I want to get the full structure, given the fact a sub element has a type that is a super type. In this example, I want to get the full list of historical values, with their dependencies: if the de...
一种解决方法是将多个Union连接起来：
Note--see comments for actual issue. Original issue: I'm trying constructor injection feature of EF Core 2.1 RC1. Consider the following entities and DBContext configuration: public class MyEntity { public int Id { get; set; } public Own...
Here is an example of fetching entities by composite using EF Core: 代码语言:txt 复制 // Entity model public class Entity { public int Key1 { get; set; } public int Key2 { get; set; } // Other properties } // DbContext public class MyDbContext : DbContext { public DbSet<Entity...
Extends your DbContext with features such as: Include Filter, Auditing, Caching, Query Future, Batch Delete, Batch Update, and more. For EF Core: 2-8. Website|GitHub repository|NuGet Entity Framework Extensions Extends your DbContext with high-performance bulk operations: BulkSaveChanges, BulkIns...
context.Consortia.Include(c=>c.Ships).FirstOrDefault() EF Core was able to retrieve the data from the separate containers and reconstruct the object graph. Owned Entities Get Embedded Within Parent Documents In Part 1, you saw that related entities were stored in their own documents. I’ve ...