entity-framework-6

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Improve this question Entity Framework can be very slow on mass insert/update/delete operations. Even the often suggested tweaks to turn off AutoDetectChanges and/or ValidateOnSaveEnabled does not always help. I have come across the Z.EntityFramework.Extensions on NuGet, but it seems

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Improve this question Entity Framework can be very slow on mass insert/update/delete operations. Even the often suggested tweaks to turn off AutoDetectChanges and/or ValidateOnSaveEnabled does not always help. I have come across the Z.EntityFramework.Extensions on NuGet, but it seems

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Improve this question Entity Framework can be very slow on mass insert/update/delete operations. Even the often suggested tweaks to turn off AutoDetectChanges and/or ValidateOnSaveEnabled does not always help. I have come across the Z.EntityFramework.Extensions on NuGet, but it seems

问题 For example when we write protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<tblError>().MapToStoredProcedures(); } Then it will create 3 stored procedures in the database with the names of tblError_Delete , tblError_Insert , tblError_Update My question is about tblError_Select : how to map a stored procedure that is used to execute select queries? I want EF to be generate tblError_Select along with preceding 3 stored procedures. I want to do CRUD

问题 I was adding claims in the repository like this and it was working fine: protected override void OnModelCreating(DbModelBuilder modelBuilder) { // ... modelBuilder.Entity<IdentityUserClaim>().ToTable("AspNetUserClaims"); modelBuilder.Configurations.Add(new ExperienceMap()); } But when I added the application user to the code, it throws the error shown below the next block of code: protected override void OnModelCreating(DbModelBuilder modelBuilder) { // ... //Error occurs when I add this

问题 I was adding claims in the repository like this and it was working fine: protected override void OnModelCreating(DbModelBuilder modelBuilder) { // ... modelBuilder.Entity<IdentityUserClaim>().ToTable("AspNetUserClaims"); modelBuilder.Configurations.Add(new ExperienceMap()); } But when I added the application user to the code, it throws the error shown below the next block of code: protected override void OnModelCreating(DbModelBuilder modelBuilder) { // ... //Error occurs when I add this

问题 public class A { [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public virtual int Aid { get; set; } public virtual ICollection<B> B { get; set; } } public class B { [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public virtual int Bid { get; set; } [Key] [Column(Order = 0)] [Required] Public virtual string BName {get ; set} [Key] [Column(Order = 1)] [Required] public virtual int Aid { get; set; } [ForeignKey("Aid")] public virtual A A { get; set; } public virtual ICollection<C>

问题 For a couple of months i had no issue about generating the model from DB by deleting it and recreating it . After a pull from git, an issue has been occurred while trying to make the same process . After the second step (connection string creation with DB) there is no further proceed at the 3rd step and no connection string with the data base is being created at the app.config file.I have tried to test the connection with the database credentials and i am getting the following . When i try to

问题 For a couple of months i had no issue about generating the model from DB by deleting it and recreating it . After a pull from git, an issue has been occurred while trying to make the same process . After the second step (connection string creation with DB) there is no further proceed at the 3rd step and no connection string with the data base is being created at the app.config file.I have tried to test the connection with the database credentials and i am getting the following . When i try to

问题 I have created a query that allows group messages based on the reference number and chose each group's latest record. var list = _context.Messages.Include(m => m.SenderId).Include(m => m.ReceiverId) .Where(m => m.Status != MessageStatus.Archived) .OrderByDescending(m => m.DateAdded) .GroupBy(m => m.Reference) .Select(g => g.OrderByDescending(m => m.DateAdded).FirstOrDefault()).ToList(); Can someone suggest how to convert this to EF Core? 来源： https://stackoverflow.com/questions/64836474/ef6