code-first

What the purpose of OnModelCreating in EF4 Code-First?

由 限于喜欢 提交于 2019-12-03 06:53:19
问题 I was curious about what the purpose of OnModelCreating in EF4 Code-First context class? How does it work? 回答1: Here is a nice article in ADO.NET Team Blog. In short, this event is mainly for Fluent mapping. 回答2: OnModelCreating gives you access to a ModelBuilder instance that you can use to configure/customize the model. As the previous answer mentions, you will typically use the code-first fluent API within it. Gil Fink has posted what IMHO is a clearer explanation than the article cited in

Best Practices for Lookup Tables in EF Code-First

由 旧城冷巷雨未停 提交于 2019-12-03 06:05:01
问题 I'm doing my first project with EF and I'm planning to go the code-first model. I'm trying to find a bit of guidance about handling a fairly classic "lookup table" scenario. I'm dealing with a pretty canonical situation where I'll be persisting address data. So, I have a simple address DTO... public class Address { public int Id { get; set; } public virtual string StreetAddress1 { get; set; } public virtual string StreetAddress2 { get; set; } public virtual string City { get; set; } public

Entity Framework Code First One to One Relationship

由 眉间皱痕 提交于 2019-12-03 04:36:47
问题 I have the following two models public class Account { public int Id { get; set; } public string Name { get; set; } public int CurrentPeriodId { get; set; } [ForeignKey("CurrentPeriodId")] public virtual Period CurrentPeriod { get; set; } public virtual ICollection<Period> Periods { get; set; } } public class Period { public int Id { get; set; } public int AccountId { get; set; } public DateTime StartDate { get; set; } public DateTime EndDate { get; set; } public virtual Account Account { get

EF 4.1 Code First - Determine What Properties Have Changed

由 牧云@^-^@ 提交于 2019-12-03 03:53:04
问题 I'm using Entity Framework 4.1 Code First. Is there a built-in way to get a list of what properties have changed since the entity was loaded from the database? I know code first detects that an object was changed, but is there a way to get exactly what properties have changed? 回答1: For scalar and complex properties you can use the following to extract the changed property names of an entity myEntity : var entry = context.Entry(myEntity); var namesOfChangedProperties = entry.CurrentValues

DDD with EF Code First - how to put them together?

由 ☆樱花仙子☆ 提交于 2019-12-03 03:51:25
问题 I am learning DDD development for few days, and i start to like it. I (think i) understand the principle of DDD, where your main focus is on business objects, where you have aggregates, aggregates roots, repositories just for aggregates roots and so on. I am trying to create a simple project where i combine DDD development with Code First approach. My questions are: (I am using asp.net MVC) DDD Business Objects will be different than Code First objects? Even if they will probably be the same,

Entity Framework CTP5 Code First, WPF - MVVM modeling

由 时光怂恿深爱的人放手 提交于 2019-12-03 03:38:33
I have my model all setup for my WPF application and working with entity framework ctp5 code first, here's a sample model class: public class Task { public int ID { get; set; } public int Index { get; set; } public string Content { get; set; } public int Indentation { get; set; } public DateTime Start { get; set; } public decimal Effort { get; set; } public decimal CompletedEffort { get; set; } public decimal Cost { get; set; } } What would be the recommended way to build my view model? My view models will implement INotifyPropertyChanged, I do not want the model classes to have any UI

Entity Framework Code first development Resources and Documentation

由 安稳与你 提交于 2019-12-03 02:43:56
I know EF4 is still in development but as a newcomer to the subject, I need a document, tutorial etc. with EF 4 code first approach. All the info is in EF 4 Team Blog but scattered around different posts. A full coverage would be really nice. Any one knows of a such place? The best online resource that I've seen so far is Scott Guthrie series of blogs on the new EF “code first” development option: Code-First Development with Entity Framework 4 Entity Framework 4 “Code-First”: Custom Database Schema Mapping Using EF “Code First” with an Existing Database If you are new to the subject, like you

Deploy Entity Framework Code First

由 梦想与她 提交于 2019-12-03 02:06:24
I guess I should have thought of this before I started my project but I have successfully built and tested a mini application using the code-first approach and I am ready to deploy it to a production web server. I have moved the folder to my staging server and everything works well. I am just curious if there is a suggested deployment strategy? If I make a change to the application I don't want to lose all the data if the application is restarted. Should I just generate the DB scripts from the code-first project and then move it to my server that way? Any tips and guide links would be useful.

How to use MySql and Entity Framework 4.1 code first

由 本秂侑毒 提交于 2019-12-03 00:37:51
I am trying to use MySQL database in MVCMusicStore http://mvcmusicstore.codeplex.com/ instead of MSSQL. I would like to learn Code first development with MySQL. I had added these code to web.config <connectionStrings> <add name="MusicStoreEntities" connectionString="Server=localhost; Database=MvcMusicStore; Uid=root; Pwd=;" providerName="MySql.Data.MySqlClient"/> </connectionStrings> <system.data> <DbProviderFactories> <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql

How to specify two navigation properties from entity X to the same target entity, Y?

由 落爺英雄遲暮 提交于 2019-12-02 18:11:51
问题 Consider that I have an Instructor class: public class Instructor { public InstructorTypesEnum Type { get; set; } public virtual ICollection<Course> Courses { get; set; } public virtual ICollection<Course> CoInstructingCourses { get; set; } } Here, InstructorTypesEnum has two values: instructor and co-instructor. So the two navigation properties Courses and CoInstructingCourses are supposed to return those different courses. Of course I am also having difficulties specifying the coresponding
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