entity-framework-core

问题 Since I updated to Visual Studio 2015 update 3 and restored my Nuget packages I'm getting an Could not load type 'Microsoft.Extensions.DependencyInjection.ServiceProviderExtensions' from assembly 'Microsoft.Extensions.DependencyInjection.Abstractions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. error.In my project.json file I have the following Entity Framework packages defined "EntityFramework.Core": "7.0.0-rc1-final", "EntityFramework.Relational": "7.0.0-rc1-final",

问题 I'm writing an API in ASP.NET Core 3.1, using EF Core to access a SQL Server database. I have a function in the API that needs to call a stored procedure with several input parameters and an output parameter. A simplified version of this function is below. I am using a DbContext with .UseInMemoryDatabase() for other tests, but the in memory database cannot be used with stored procedures. (This solution is database first, not code first. It would be possible to change the stored procedure if

问题 I have a requirement to switch to a different data sources at runtime. sometimes user wants to connect to a different database server to manipulate data. There can be more than 100 client servers with an identical database. Original project is a .net core Web API and the server name is an input parameter. This is what I thought. Is there a better alternative? public class Person { public int Id { get; set; } public string Name { get; set; } } public class MyDbContext : DbContext { public

问题 I am trying to customize some ASP.NET Identity Core classes which use Generics. My ApplicationUser class: public class ApplicationUser : IdentityUser<Guid>//, ApplicationUserClaim, ApplicationRole, ApplicationUserLogin> { public ApplicationUser() { } } My ApplicationUserStore class: public class ApplicationUserStore : UserStore<ApplicationUser, ApplicationRole, ApplicationDbContext, Guid> { public ApplicationUserStore(ApplicationDbContext ctx, IdentityErrorDescriber describer = null) : base

问题 Situation We have a controller where users can submit any number of E-Mail addresses to invite other (potential) members as friends. If an address is not found in the database, we send an E-Mail message to that user. Since the user does not has to wait for this process to complete in order to continue working this is done asynchronously. Sending E-Mails can take a long time if servers respond slowly, are down or overloaded. The E-Mail sender should update the database according to the status

问题 I have set up a self referential entity using EF Core which looks like this: Entity public class DetailType { public int DetailTypeId { get; set; } public string Name { get; set; } public int? ParentTypeId { get; set; } public DetailType ParentType { get; set; } public IEnumerable<DetailType> ChildTypes { get; set; } } Binding modelBuilder.Entity<DetailType>() .ToTable("detailtype") .HasOne(x => x.ParentType) .WithMany(x => x.ChildTypes) .HasForeignKey(x => x.ParentTypeId); I am retrieving

问题 I am trying to use stored procedures in Entity Framework Core. When executing a stored procedure, I am passing two input parameters and one output parameter. I keep getting this error: The SqlParameterCollection only accepts non-null SqlParameter type objects, not SqlParameter objects. This is my code: public string InsertCardsData(DateTime RecordingStartDate, DateTime RecordingEndDate) { try { // DateTime DRecEndDate = Convert.ToDateTime(RecordingEndDate); DateTime DRecEndDate =

问题 I'm working on Transaction per mutation with EF core. I tried an implementation by adding my transaction logic into the Request pipeline UseRequest and it's quite good. But the problem with this implementation is that the transaction logic will be executed each time we have an incoming request Query or Mutation. I think that the Hot Chocolate middlewares can do the work by adding a middleware on all incoming mutations, but the only doc I found is about adding middlewares to fields https:/

问题 I am trying to Order by a query using the following efcore query Getting the PropertyInfo for the column which needs to be orderedBy using this below var propertyInfo = typeof(TableVM).GetProperty("Type"); The EfCore Query db.Table **//LinkKit Extension Method** .AsExpandable() .Where(whereClause) .Select(m => new TableVM { id= m.Id, name = m.Name, description = m.Description, type = m.Type, status = m.Status }) **// Conversion of the OrderBy fails, which throws an exception saying it can't

问题 I am trying to Order by a query using the following efcore query Getting the PropertyInfo for the column which needs to be orderedBy using this below var propertyInfo = typeof(TableVM).GetProperty("Type"); The EfCore Query db.Table **//LinkKit Extension Method** .AsExpandable() .Where(whereClause) .Select(m => new TableVM { id= m.Id, name = m.Name, description = m.Description, type = m.Type, status = m.Status }) **// Conversion of the OrderBy fails, which throws an exception saying it can't