sqlite - EF Core 更新数据库抛出 System.NullReferenceException

Question

我正在尝试使用 EF.Core 测试制作 SQLite 数据库。尽管我尽了一切努力让它工作，但它仍然没有按预期工作，我不知道为什么。 Add-Migration 命令工作正常，但是当我尝试 Update-DataBase 时它抛出 System.NullReferenceException。任何人都知道为什么会这样？您可以在下面看到代码和异常。

public class TestModel
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }
        public string Name { get; set; }
    }

private const string ConnectionString = "Data Source = AutoHome.db";

        public DbSet<TestModel> testModels { get; set; }
        protected override void OnConfiguring(DbContextOptionsBuilder options)
        {
            options.UseSqlite(ConnectionString);
            base.OnConfiguring(options);
        }

PM> Update-DataBase Build started... Build succeeded. System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.Data.Sqlite.SqliteConnection.Open() at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.OpenDbConnection(Boolean errorsExpected) at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open(Boolean errorsExpected) at Microsoft.EntityFrameworkCore.Sqlite.Storage.Internal.SqliteDatabaseCreator.Exists() at Microsoft.EntityFrameworkCore.Migrations.HistoryRepository.Exists() at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration) at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) Object reference not set to an instance of an object. PM>

Answer 1

这似乎是 Microsoft.Data.Sqlite.Core 的问题。我刚刚添加了一个引用 Microsoft.Data.Sqlite，现在一切正常。

OBS!!!

关于这个 GitHub/EF/Issues 已经有一个开放的工单