entity-framework-core

问题 I am using EF Core 2.0 code first migration. I am trying to run the migration sin to the new database. I am using seed data. I am getting error if i use seed data and no error if i comment out the seed data method. Not sure what is the problem. Can anyone please help? Error: System.Data.SqlClient.SqlException (0x80131904): There is already an object named 'WorkflowBranches' in the database. The tables are created, but no records appear in the migrationhistory table, even though I have around

问题 Below is my method, which calls a stored procedure. public List<int> GetActivityListforUser(string userId) { IList<int> results = new List<int>(); context.LoadStoredProc("dbo.GetRegionOrganizationActivities") .WithSqlParam("userId", userId) .ExecuteStoredProc((handler) => { results = handler.ReadToList<int>().ToList(); }); return results.ToList(); } My stored procedure dbo.GetRegionOrganizationActivities , returns only one column Id, which is the required result up on passing the parameter

问题 Can anybody tell me why the related Article entities are not being loaded on .Include(a => a.Article) ? They are always NULL even though ArticleId does indeed have a value. The relationship between FrontPageItem and Article is 1-0..1. An Article can exist without any connection to a FrontPageItem , but a FrontPageItem must have one Article . In a rather ugly workaround, I have resorted to foreach -ing through all the returned items in the list and adding Article manually, as you can see in my

问题 I am trying to connect to my local instance of SQL Server using a linux Docker container running on my Windows machine. I can connect successfully using Data Source=localhost when running under Windows. I've discovered that localhost is not supported in a connection string on linux, so here is what I've also tried and failed with: Data Source=localhost Data Source=localhost,1433 Data Source=127.0.0.1 Data Source=127.0.0.1,1433 Data Source=127.0.0.11 Data Source=127.0.0.11,1433 Data Source=172

问题 I use entity framework 2.2.6. I have AddOrUpdate method. When client try to operate(insert or update) on entity I check if entity exist on db by unique values and I set old data id value to new data id value and I set it as updated. If not exist I set it as insert public void AddOrUpdate(TEntity entity, Expression<Func<TEntity, bool>> predicate) { var oldEntity = Get(predicate); DetachEntry(oldEntity); if (oldEntity != null) { var idProperty = entity.GetType().GetProperties().First(x => x

问题 I'm trying to use PostgreSQL for the first time and having a little trouble getting it to build without errors unless I lock into RC2 packages which is fine. After locking into the RC2 packages, I have one error that I can't seem to shake that I could use help troubleshooting: ERROR Startup.cs(22,18): error CS1061: 'IServiceCollection' does not contain a definition for 'AddNpgsql' and no extension method 'AddNpgsql' accepting a first argument of type 'IServiceCollection' could be found (are

问题 I have Core MVC application, when for specific entity I have following model: public class Aktualnosci { public long ID { get; set; } public string Tytul { get; set; } public string Tresc { get; set; } public DateTime Dzien { get; set; } public byte[] AktualnosciImage { get; set; } } For uploading the image I am using IFormFile property in my viewmodel, that is called by controller, according to the documentation from >>HERE<<: public class AktualnosciCreateVM { public long ID { get; set; }

问题 It is easy to add plain string annotations to the EF model with HasAnnotation method that accept object type of argument, but trying to add structured annotations you will get errors on build migration: modelBuilder.Entity<Group>().HasAnnotation($"{GetType().FullName}.Constraint3", new ValueTuple<string,string>( "aaa", "bbb" )); The current CSharpHelper cannot scaffold literals of type 'System.ValueTuple`2[System.String,System.String]'. Configure your services to use one that can.

问题 I am mapping JSON_VALUE using the technique from How to write DbFunction's translation. Since not all values in the JSON are strings, conversion is sometimes necessary. When converting to int , everything is fine: var results = context.Set<SampleTable>() .Where(t1 => Convert.ToInt32( JsonExtensions.JsonValue(t1.SampleJson, "$.samplePath.sampleInt")) > 1); .ToList(); The resulting SQL is: SELECT * FROM [SampleTable] AS [t1] WHERE (CONVERT(int, JSON_VALUE([t1].[SampleJson], N'$.samplePath

问题 I'm trying to run ef7 migration on fresh asp.net 5 preview project. Steps I took: Created fresh project based on template "ASP.NET 5 preview starter web" Build it Try command Add-Migration in Package Manager console Result: The term 'Add-Migration' is not recognized as the name of a cmdlet, function, script file, or operable program. I also try this command: Install-Package EntityFramework.Commands -Pre I think for VS 2015 project is redundant, it executed but still Add-Migration was not