code-first

问题 I have this custom type: public struct PasswordString { private string value; public PasswordString(string value) { this.value = MD5.CalculateMD5Hash(value); } public string Value { get { return this.value; } set { this.value = MD5.CalculateMD5Hash(value); } } public static implicit operator PasswordString(string value) { return new PasswordString(value); } public static implicit operator string(PasswordString value) { return value.Value; } public static bool operator ==(string x,

问题 I've successfully mapped an Entity Framework Code-First data model with an existing Sql Server Compact database by a declarative approach using app.config but it would be great if I could build such connection programmatically with perhaps the help of the EntityConnectionStringBuilder (System.Data.EntityClient) class. Unfortunately this approach is not working as the [DbContext].Connection.ConnectionString is not accepting most of its properties. Here's the actual working code with the faulty

问题 I am trying to generated an entity framework code first model from an existing database (without changing the database schema). This database has been used in the past to generate edmx models and I am trying to achieve the equivalent model using Fluent Api or data annotations. The relationship I have been unable to reproduce is 0..1 to many using a join table (not a nullable foreign key). So it would look something like this: TableA { ID (PrimaryKey) TableB (0 or 1) } JoinTable { TableA_FK

问题 Hi Im currently working with .sdf database (Server Compact Version 4.0) and sql express. I'm trying to setup a cascade delete on a same table (category - sub category) but I get that I cant add relation to the same table. A foreign key constraint had and update or a delete cascade rule, and self-references a column in the same table, is not allowed What can I do about this? EDIT I'm the only one with this problem? 回答1: As your SQLException suggested, this is a limitation of SQL Server in

问题 I have the following Model public class FilanthropyEvent : EntityBase, IDeleteable { public int Id { get; set; } public string Name { get; set; } public DateTime EventDate { get; set; } public string Description { get; set; } public decimal Target { get; set; } public decimal EntryFee { get; set; } public bool Deleted { get; set; } public ICollection<EventAttendee> EventAttendees { get; set; } } public class Attendee : EntityBase, IDeleteable { public int Id { get; set; } public string Email

问题 I have the following Model public class FilanthropyEvent : EntityBase, IDeleteable { public int Id { get; set; } public string Name { get; set; } public DateTime EventDate { get; set; } public string Description { get; set; } public decimal Target { get; set; } public decimal EntryFee { get; set; } public bool Deleted { get; set; } public ICollection<EventAttendee> EventAttendees { get; set; } } public class Attendee : EntityBase, IDeleteable { public int Id { get; set; } public string Email

问题 I'm working on an ASP.NET MVC 6 project with Entity-Framework Core (version "EntityFramework.Core": "7.0.0-rc1-final" ) backed by a SQL Server 2012 express DB. I need to model a many-to-many relationship between a Person entity and an Address entity. As per this guide I modeled it with a PersonAddress join-table entity, because this way I can store some extra info. My goal is to set-up my system this way: If a Person instance is deleted, all the related PersonAddress instances must be deleted

问题 how can i use asp.net membership in ServiceStack ? (ServiceStack.OrmLite , ServiceStack.Host.AspNet , etc ) 回答1: You can host ServiceStack on a custom path, i.e. at /api which lets you run ASP.NET web forms and ServiceStack side-by-side and then use the normal ASP.NET membership provider in ASP.NET. You can then share UserSessions with ServiceStack using its Session Provider, here's an example on how to instantiate a Session with MVC - you can use this same class with ASP.NET. The alternative

问题 What is the best way to separate the mapping of tables to entities using the Fluent API so that it is all in a separate class and not inline in the OnModelCreating method? What I am doing currently: public class FooContext : DbContext { // ... protected override OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<Foo>().Property( ... ); // ... } } What i want: public class FooContext : DbContext { // ... protected override OnModelCreating(DbModelBuilder modelBuilder) {

问题 I have a column in the database that cannot be null, and I want to set it to have a default value in the database . The problem is that entity framework seems to create a default value itself (for example, int => 0), and completely ignores the default value constraint in the database. Is there any way to disable this default valuing of entity framework? 回答1: Natively, Entity framework do not allows this. You have to do some code to it. This answer from another site seems to had solved the