entity-framework-core

问题 I have a model that looks like this: public class Facility { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } public NetTopologySuite.Geometries.Point Location { get; set; } } Test code for adding a Point: var testFacility = new Facility(); testFacility.Location = new NetTopologySuite.Geometries.Point(13.003725d, 55.604870d) { SRID = 3857 }; //Other values tested with the same error error //testFacility.Location = new NetTopologySuite.Geometries.Point(13

问题 The command "Add-Migration InitialCreate" generates the following error message: Could not load assembly 'MathModelApp'. Ensure it is referenced by the startup project 'MathModelApp'. What does the error message mean? I am using netcore 2.1, Target Platform is x86. 回答1: Please go to solution property and check if you selected same project as the startup project in the solution or not. 回答2: Right Click on EndPoint Project Click on the Set As Startup Project 来源： https://stackoverflow.com

问题 The command "Add-Migration InitialCreate" generates the following error message: Could not load assembly 'MathModelApp'. Ensure it is referenced by the startup project 'MathModelApp'. What does the error message mean? I am using netcore 2.1, Target Platform is x86. 回答1: Please go to solution property and check if you selected same project as the startup project in the solution or not. 回答2: Right Click on EndPoint Project Click on the Set As Startup Project 来源： https://stackoverflow.com

问题 I've one DbContext with all working to access my Postgresql DB, but I need to run one little SQL command when connection session starts with DB. I need to do this for every interaction. To be more specific, it's a function for set a session variable with user name logged. It's possible to do something to handle that in EF Core? --SOLUTION-- I didn't realized that I could specify a connection directly in OnConfiguring like bricelam says. I need to do this in every connection because it's a

问题 I've one DbContext with all working to access my Postgresql DB, but I need to run one little SQL command when connection session starts with DB. I need to do this for every interaction. To be more specific, it's a function for set a session variable with user name logged. It's possible to do something to handle that in EF Core? --SOLUTION-- I didn't realized that I could specify a connection directly in OnConfiguring like bricelam says. I need to do this in every connection because it's a

问题 I'm working on a project that uses EFCore 2.1.0-preview1-final code first approach. Like in EF6 (and previous versions) I want to ensure the compatibility of my DbContext (and models) to the database. In EF6 it was enabled by default and it was possible to deactivate it with Database.CompatibleWithModel(false);. As far as I know EF uses the __MigrationHistory table where the model information was stored. EFCore has no such column in __EFMigrationsHistory table that could provide such

问题 I have two classes public class InvoiceRow { public int Id { get; set; } public int InvoiceId { get; set; } public int ProductId { get; set; } public virtual Product Product { get; set; } public int Amount { get; set; } } public class Invoice { public int Id { get; set; } private ICollection<InvoiceRow> _rows; public virtual ICollection<InvoiceRow> Rows => _rows ?? (_rows = new List<InvoiceRow>()); } I use Update method in the repository class public void Update(Invoice record) { dB.Invoices

问题 I'm using Entity Framework Core with Code First approach but recieve following error when updating the database: Introducing FOREIGN KEY constraint 'FK_AnEventUsers_Users_UserId' on table 'AnEventUsers' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. Could not create constraint or index. See previous errors. My entities are these: public class AnEvent { public int AnEventId { get; set; } public DateTime

问题 Unfortunately my EF application has to call stored procedures I am unable to change. While this is not ideal I can normally get around it. However, I have a stored proc that does return anything. How does EF core deal with this? I know in previous versions you could run ExecuteNonQuery but I haven't been able to find anything similar in EF Core. I normally run my queries through a helper as such, where T is a class that maps to a return type EF can serialize to: context.Set<T>() .AsNoTracking

问题 Unfortunately my EF application has to call stored procedures I am unable to change. While this is not ideal I can normally get around it. However, I have a stored proc that does return anything. How does EF core deal with this? I know in previous versions you could run ExecuteNonQuery but I haven't been able to find anything similar in EF Core. I normally run my queries through a helper as such, where T is a class that maps to a return type EF can serialize to: context.Set<T>() .AsNoTracking