ef-migrations

问题 Using EF6 code-first migrations, I am able to successfully save models and create new migrations for them. However, my DbContext class is in a Sharp.Data project, the actual (Sql CE) database lives under the Sharp.Server project bin folder, and my models live in a Sharp.Common project. When I run add-migration -ProjectName Sharp.Data Migration3 (pointing to Sharp.Data as that is where the DbContext is), it successfully runs and identifies changes made to the models in the Sharp.Common project

问题 I am using entity to connect to an existing database using code first migrations. In the database I need to connect to a few tables that already exist and add a few new ones. I thought I had it figured out but it is still trying to create the tables that already exist. Here is the model of one of the tables: namespace PTEManager.Domain { public partial class OpsUser { public int u_user_id { get; set; } public Guid DepartmentID { get; set; } public string email_addr { get; set; } public string

问题 I hosted my project in ubunto 18.4 version server.All configurations done after it's not working,in the browser it shows 503 error. when I try to manually execute .dll file it show some errors. Could not resolve a service of type 'SocialApp.API.Data.Seed' for the parameter 'seeder' of method 'Configure' on type 'SocialApp.API.Startup'. ---> System.ArgumentNullException: Value cannot be null. Parameter name: connectionString here is the full error code Microsoft.AspNetCore.DataProtection

问题 I am developing an ASP.NET MVC project. I am using Entity Framework code first approach to interact with database. But I am having a problem with setting on cascade delete for self-reference foreign key for an entity. This is my entity class with self reference foreign key public class Category { public int Id { get; set; } [Required] [MaxLength(50)] public string Name { get; set; } [MaxLength(55)] public string MmName { get; set; } public int? ParentId { get; set; } [ForeignKey("ParentId")]

问题 I have an existing Database with a some amount of data (i.e. DB is not empty). Now I made a decision to encrypt some sensitive data. I have a column TemplateBlocks : string . I'm going to replace it with new column TemplateBlocksEnc : byte[] and I did properly changed my Code First model. Then I generated migration and ... stuck! public partial class EncryptTemplateBlocks : DbMigration { public override void Up() { AddColumn("dbo.Devices", "TemplateBlocksEnc", c => c.Binary(nullable: true));

问题 Example Let's say the number of answers of multiple choice questions varies. One question can have only 2 choices while another can have 10 choices. How can I save these multiple choice questions in my SQL Server database? Is the following model viable? public class MultipleChoiceQuestion { [Key] public Guid Id { get; set; } [Required] public string Question { get; set; } // Suppose I can have 2-10 answers [Required] public List<string> Answers { get; set; } } Question Can we store a list of

问题 I've just begun using Entity Framework 5 (Code First Migrations). I think my issue may just be a given to someone that's worked with this a bit longer than I have (this is our first project giving it a go). I have 3 tables involved. One is a cross reference table. The gist of the classes is as follows: public class Person { //person properties public virtual List<Roles> Roles {get;set;} } public class Role { //Role properties public virtual List<Person> Persons {get;set;} } Adding a migration

问题 I have a brand-new ASP.NET MVC 5 project with one DbContext using Entity Framework 6.1 and Identity 2.2.1. Trying go use IoC, I created a 2nd DbContext and some classes belonging to that 2nd context. Most of these classes have a foreign key to the IdentityUser class within Identity 2.2.1. The problem I'm having is that when I try to use Add-Migrations I get the following error: One or more validation errors were detected during model generation: {MyProjectName}.DataContexts.IdentityUserLogin:

问题 I have an assembly with an EF 5.0 (target framework 4.0) migrations in it. When I open the package management console and type 'update-database' I get an BadImageException. (note: I have one c++ native lib in the solution). I have read several post regarding this and I tried: All projects have x64 target platform Solution platform is x64, all projects have x64 as configuration No warnings during build But...when I added a console app, using DBMigrator class the migration works fine! What

问题 The problem I'm having is that when I "Add-Migration", it seems that no comparison against the target database is done and the Up/Down methods are empty. This starts from me targeting different environments. The migration changes work fine when I update-database and it targets one particular database, my dev database. When I change the connection string to target another database, another dev box on another server, and try to add-migration for that particular environment, the Up/Down methods