MS SQl Server引进两种特殊的数据类型geography and geometry public partial class Course { public Course() { this.Students = new HashSet<Student>(); } public int CourseId { get; set; } public string CourseName { get; set; } public Nullable<int> TeacherId {…

Spatial Data type support in Entity Framework 5.0 MS SQL Server 2008 introduced two spatial data types, geography and geometry. Geography represents data in a round-earth coordinate system and geometry represent data in a Euclidean (flat) coordinate…

To migrate your existing Entity Framework 4.x project to Entity Framework 5.0 using VS2012, first target .NET Framework 4.5: Second, remove the existing Entity Framework 4.1/4.3 reference and install Entity Framework 5.0 from NuGet: Search for Entity…

Data Developer Center > Learn > Entity Framework > Get Started > Loading Related Entities Loading Related Entities Entity Framework supports three ways to load related data - eager loading, lazy loading and explicit loading. The techniques sho…

[索引页][源码下载] 精进不休 .NET 4.5 (12) - ADO.NET Entity Framework 6.0 新特性, WCF Data Services 5.6 新特性 作者:webabcd 介绍精进不休 .NET 4.5 ADO.NET Entity Framework 6.0 新特性 WCF Data Services 5.6 新特性 示例1.演示 ADO.NET Entity Framework 6.0 的新特性 - 对 async await 的支持EF6.aspx <%…

源码学习的重要性,再一次让人信服. ASP.NET MVC Application Using Entity Framework Code First 做MVC已经有段时间了,但看了一些CodePlex上的代码,仍然觉得需要学习的东西还很多,基本上功能都可以实现,但如果放弃去利用框架本身已经聚合与提供的便利性功能,那往往会事倍功半,即使实现,也不漂亮不专业,不舒服. 很多专业的东西都在那里,没事瞅瞅,不要动不动一上来就老三样,或者放弃好东西,用自己的老办法去经验性的解决,既然可以实现,那就要去找…

Transaction support: Entity Framework by default wraps Insert, Update or Delete operation in a transaction, whenever you execute SaveChanges(). EF starts a new transaction for each operation and completes the transaction when the operation finishes.…

DBSet的Local属性提供简单的从context上下文获取当前已经被跟踪的实体(实体不能被标记为Deleted状态) using System.Data.Entity; class Program { static void Main(string[] args) { using (var ctx = new SchoolDBEntities()) { ctx.Students.Load(); ctx.Students.Add(new Student() { StudentName = "N…

You can change the color of an entity in the designer so that it would be easy to see related groups of entities in the designer from Visual Studio 2012 onwards. To change the color of an entity, select entity in the designer → go to property window…

Visual Studio 2012 provides a facility to split the design time visual representation of the Entity Data Model. This means that you can have multiple diagrams for one Entity Data Model. You can create a new diagram in multiple ways: Add a new diagram…