WebSelect specific columns when using include statement with entity framework When using the Include method in Entity Framework to load related entities, you can use the Select method to specify which columns to load for the related entities. Here's an example: Web将您的导航属性声明为虚拟，将其列表为ICollection，并在对实体进行水合处理时将EF替换为其具体实现： public class Project { public Project { Members = new HashSet(); } public Guid Id { get; set; } public string Name { get; set; } public virtual ICollection Members { get; set; } } public class ProjectMember { …
Entity Framework Performance and What You Can Do About It
WebJan 30, 2024 · This page describes these performance issues, and shows an alternative way to load related entities which works around them. Cartesian explosion Let's examine the following LINQ query and its translated SQL equivalent: c# var blogs = ctx.Blogs .Include (b => b.Posts) .Include (b => b.Contributors) .ToList (); SQL SELECT [b]. [Id], [b]. WebEntity Framework does an amazing job at generating queries, however, they are not always optimized and can end up transferring more data than the query really needs. The SQL generated by EF+ IncludeOptimized performs multiple SELECT but drastically decreases the amount of data transferred. SQL Generated by Entity Framework Include cummins microwave
Entity Framework - First Example - TutorialsPoint
WebOct 7, 2024 · If you wanted e.g. the customer id, name and the total number of projects, you wouldn't use Include. You would create a new type which only has the properties you are interested in. Then you would use projection to populate that type and return it … WebFeb 23, 2024 · Using the entities is equivalent to performing a Select * From Table query. It’s not wrong to select *, but by employing the Select method, we can use projections, which allows us to: Reduce the amount of data transmitted over the network. Improve SQL execution times. Explicitly return only the data we need. WebApr 20, 2024 · SelectMany method Include method in Entity Framework has two overloads. One of which takes navigation property as a string. The other one is Include lambda method. The Include Lambda method is an extension method from the namespace System.Data.Entity. easy4u loans