entity-framework-core

问题 In ef core 2.2 I have used DbQuery to map raw sql results to object as following: public partial class AppDbContext{ public DbQuery<SimpleQueryModel> SimpleQM {get;set;} } and then var result=_dbContext.SimpleQM.FromSql(sqlString,params); this wouldn't create any extra table and working just fine. In ef core 3.1 DbQuery is obsolete and telling me to use keyless DbSet instead. I have configured it as following: public partial class AppDbContext{ public DbSet<SimpleQueryModel> SimpleQM {get;set

问题 In my asp.net core project i have a ReadingContext class derived from DbContext . According to documentation OnConfiguring should be called for every instance of DbContext that is created. But in my case it is only called when i inspect the instance while debugging. I have a breakpoint inside OnConfiguring but it is not hit even when the method is called. OnConfiguring method. . Instance created but OnConfiguring not called yet . OnConfiguring called on looking into the object but it's

问题 I am currently designing a web application where the data needs to be stored encrypted. Planned technologies used: ASP.NET Core API ASP.NET Core Entity Framework MS SQL Server 2012 any Web Frontend Because of the specification, we need to store all data encrypted in the database. Which would be a good approach to achieve this while still be able to use the Entity Framework & LINQ, so the developer does not have to take care of the encryption. Is it possible to encrypt the whole database? 回答1:

问题 Im getting this WARNING in EntityFramework Core what is wrong? I already set MSSQL Datebase to Case Sensitive. Latin1_General_100_CS_AS var test = await _context.Students .FirstOrDefaultAsync(m => m.LastName.Equals("ALEXANDER", StringComparison.InvariantCultureIgnoreCase)); Microsoft.EntityFrameworkCore.Query:Warning: The LINQ expression 'where [m].LastName.Equals("ALEXANDER", InvariantCultureIgnoreCase)' could not be translated and will be evaluated locally. 回答1: You have to be aware of the

问题 I am trying to port this class to EF core: https://github.com/mehdime/DbContextScope/blob/master/Mehdime.Entity/Implementations/DbContextScope.cs However I am having this issue: Error CS0246: The type or namespace name 'IObjectContextAdapter' could not be found (are you missing a using directive or an assembly reference?) (CS0246) (Mehdime.Entity) and this: Error CS0246: The type or namespace name 'ObjectStateEntry' could not be found (are you missing a using directive or an assembly

问题 After I upgraded to Asp.Net Core 3.0 I am getting the following error for my Identity class when attempting to create a user: Unable to track an entity 'User' of type because primary key property 'id' is null. Here User represents my extension of the Identity model. This is the line of code where the error occurs: var result = await _userManager.CreateAsync(user, password); 回答1: This is due to breaking changes in EF Core 3.0 which can be found under this link: https://docs.microsoft.com/en-us

问题 After I upgraded to Asp.Net Core 3.0 I am getting the following error for my Identity class when attempting to create a user: Unable to track an entity 'User' of type because primary key property 'id' is null. Here User represents my extension of the Identity model. This is the line of code where the error occurs: var result = await _userManager.CreateAsync(user, password); 回答1: This is due to breaking changes in EF Core 3.0 which can be found under this link: https://docs.microsoft.com/en-us

问题 I want to create a unit test to ensure no developer will commit model changes without the corresponding migration. How do I test that the database matches the DbContext? 回答1: You can leverage some of the lower-level Migrations components to do that: var migrationsAssembly = db.GetService<IMigrationsAssembly>(); var differ = db.GetService<IMigrationsModelDiffer>(); var hasDifferences = differ.HasDifferences( migrationsAssembly.ModelSnapshot.Model, db.Model); Assert.False(hasDifferences, "You

问题 I want to create a unit test to ensure no developer will commit model changes without the corresponding migration. How do I test that the database matches the DbContext? 回答1: You can leverage some of the lower-level Migrations components to do that: var migrationsAssembly = db.GetService<IMigrationsAssembly>(); var differ = db.GetService<IMigrationsModelDiffer>(); var hasDifferences = differ.HasDifferences( migrationsAssembly.ModelSnapshot.Model, db.Model); Assert.False(hasDifferences, "You

问题 My goal I want to create a new IdentityUser and show all the users already created through the same Blazor page. This page has: a form through you will create an IdentityUser a third-party's grid component (DevExpress Blazor DxDataGrid) that shows all users using UserManager.Users property. This component accepts an IQueryable as a data source. Problem When I create a new user through the form (1) I will get the following concurrency error: InvalidOperationException: A second operation