vardbContext =newEFCoreDbContext();varblog =dbContext.Blogs.FirstOrDefault();varposts = blog.Posts.ToList(); 对于EF Core中的延迟加载和EF 6.x使用方式无异,接下来我们再来看看官网给出了未启用代理也可进行延迟加载,通过安装【Microsoft.EntityFram
在EF Core 2.1中我们需要下载【Microsoft.EntityFrameworkCore.Proxies】包,同时在OnConfiguring方法中配置启用延迟加载代理,如下: 除了通过如上配置外导航属性必须用virtual关键字修饰(如上示例类未添加,请自行添加),否则将抛出异常,你懂的。接下来在完全配置好延迟加载的前提下再来进行如下查询,此时在我们需要用到Posts时...
最后我们来总结一下Lazy Loading的优势和劣势:当打开Lazy Loading时,我们可以不用去在意某实体是否已经加载,不会出现在调用某一实体时,出现null的尴尬,省去程序员不少心力,但同时劣势也非常明显,如果我们有大量实体,且频繁去调用相关实体,程序就会频繁地访问数据库,这很显然地会影响程序的性能。 下一次我们会来分析关...
One notable benefit of Eager Loading is the reduction of database round-trips.By loading related entities alongside the main entity in a single query, we minimize the need for subsequent database calls. This is beneficial in scenarios where fetching related data is inevitable, as it mitigates th...
EntityFrameworkCore.Proxies [Dotnet CLI] add package Microsoft.EntityFrameworkCore.Proxies Use the UseLazyLoadingProxies method to enable the creation of proxies in the OnConfiguring method of the DbContext: language-csharp Explain code | Copy code protected override void OnConfiguring(DbContextOptions...
Yes, lazy loading is enabled in the Entity Framework ORM too, it is on by default in Entity Framework, so if you want to enable lazy loading in Entity Framework, you don't need to do anything. Haha.. And the opposite of lazy loading is eager loading that we will see in this ...
Entity Framework 4 has Lazy Loading built-in and enabled by default. Here’s a quick bit of code to show you how to work with this feature.
Lazy loading in Entity FrameworkArticle 05/12/2008 Recently, I wrote this little article that got published in the new Insights sidebar in MSDN Magazine. In it, I mention one of the fundamental tenets of ADO.NET: *Network roundtrips should not be hidden from the developer*...
In this post, we will be discussing about Eager Loading, Lazy Loading and Explicit Loading in an Entity Framework. All three terms -- Eager Loading, Lazy Loading and Explicit Loading -- refer to the process of loading the related entities. They define when to load the related entities or ...
一种是用Microsoft.EntityFrameworkCore.Proxies包,以及调用UseLazyLoadingProxies来启用这个包。并且要求类里面的NavigationProperty需要是public且virtual 另外一种使用 Microsoft.EntityFrameworkCore.Abstractions 包中定义的 ILazyLoader 服务的引用。这个需要类里面做更多的特定代码来支持 ...