ef-core-2.0

问题 I have an aspnet core MVC application, and I need to inject the IPrincipal of the current request so that I know who is the current logged in user. I followed this article with no problem. Now I need the IPrincipal in my Dbcontext to auto-populate audit fields (CreatedBy, UpdatedBy, etc). Being naive I could inject the IPrincipal in my DbContext constructor: public MyDBContext(DbContextOptions<MyDBContext> options, IPrincipal principal) But I am using the DBContextPool , which reuses

问题 I have the following record set ID BatchID ClientName CreatedDateTime ----------- -------------- --------------- ----------------------- 1 NULL B 2018-02-16 19:07:46.320 2 NULL B 2018-02-16 19:07:46.320 3 NULL B 2018-02-16 19:07:46.597 4 NULL B 2018-02-16 19:07:46.597 5 NULL B 2018-02-16 19:10:10.260 6 NULL B 2018-02-16 19:10:10.260 7 NULL B 2018-02-16 19:21:34.303 8 NULL B 2018-02-16 19:21:34.303 9 NULL B 2018-02-16 19:21:44.780 10 NULL B 2018-02-16 19:21:44.780 11 NULL A 2018-02-16 19:24:35

问题 I have the following record set ID BatchID ClientName CreatedDateTime ----------- -------------- --------------- ----------------------- 1 NULL B 2018-02-16 19:07:46.320 2 NULL B 2018-02-16 19:07:46.320 3 NULL B 2018-02-16 19:07:46.597 4 NULL B 2018-02-16 19:07:46.597 5 NULL B 2018-02-16 19:10:10.260 6 NULL B 2018-02-16 19:10:10.260 7 NULL B 2018-02-16 19:21:34.303 8 NULL B 2018-02-16 19:21:34.303 9 NULL B 2018-02-16 19:21:44.780 10 NULL B 2018-02-16 19:21:44.780 11 NULL A 2018-02-16 19:24:35

问题 I'm trying to achieve something in EF Core that worked very well for me in EF 6. I'm serializing the contents of a List<T> property as a Json string in the DB. <T> can be pretty much anything, since Json.Net takes care of serializing whatever we throw at it. My collection exposes a Json string property and takes care of serializing/deserializing itself. This approach is convenient and efficient for structured nested data where a relational model would bring needless overhead and complexity.

问题 I'm trying to achieve something in EF Core that worked very well for me in EF 6. I'm serializing the contents of a List<T> property as a Json string in the DB. <T> can be pretty much anything, since Json.Net takes care of serializing whatever we throw at it. My collection exposes a Json string property and takes care of serializing/deserializing itself. This approach is convenient and efficient for structured nested data where a relational model would bring needless overhead and complexity.

问题 this is my appsettings.json "ConnectionStrings": { "Circolari": "Server=abcde;Database=Circolari;Trusted_Connection=True;" } and this is my startup.cs public Startup(IConfiguration configuration, IHostingEnvironment env) { Configuration = configuration; IConfigurationBuilder configurationBuilder = new ConfigurationBuilder() .SetBasePath(env.ContentRootPath) .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true); Configuration = configurationBuilder.Build(); } // This method

问题 this is my appsettings.json "ConnectionStrings": { "Circolari": "Server=abcde;Database=Circolari;Trusted_Connection=True;" } and this is my startup.cs public Startup(IConfiguration configuration, IHostingEnvironment env) { Configuration = configuration; IConfigurationBuilder configurationBuilder = new ConfigurationBuilder() .SetBasePath(env.ContentRootPath) .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true); Configuration = configurationBuilder.Build(); } // This method

问题 As documented in questions like Entity Framework Indexing ALL foreign key columns, EF Core seems to automatically generate an index for every foreign key. This is a sound default for me (let's not get into an opinion war here...), but there are cases where it is just a waste of space and slowing down inserts and updates. How do I prevent it on a case-by-case basis? I don't want to wholly turn it off, as it does more good than harm; I don't want to have to manually configure it for all those

来源： https://stackoverflow.com/questions/55151895/ef-core-updates-seeded-data-on-every-migration-without-being-changed

来源： https://stackoverflow.com/questions/49721742/ef-code-first-not-creating-the-database