如何修复调用构造函数 'Void .ctor 时抛出异常

Question

我尝试将迁移添加到我的上下文之一，但我发现了这个错误

Autofac.Core.DependencyResolutionException: An exception was thrown while activating weno.Infrastructure.Data.DataContext.AppDbContext.

 ---> Autofac.Core.DependencyResolutionException: An exception was thrown while invoking the constructor 'Void .ctor(Microsoft.EntityFrameworkCore.DbContextOptions`1
[weno.Infrastructure.Data.DataContext.AppDbContext], MediatR.IMediator)' on type 'AppDbContext'.

 ---> System.TypeLoadException: Method 'AppendIdentityWhereCondition' in type 'MySql.EntityFrameworkCore.MySQLUpdateSqlGenerator'
 from assembly 'MySql.EntityFrameworkCore, Version=5.0.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d' 
does not have an implementation.
   at MySql.EntityFrameworkCore.Extensions.MySQLServiceCollectionExtensions.<>c.<AddEntityFrameworkMySQL>b__0_3(ServiceCollectionMap m)

我有这样的 DefaultInfrastructureModule 代码：

builder.RegisterGeneric(typeof(AppRepository<>))
        .As(typeof(IRepository<>))
        .As(typeof(IReadRepository<>))
        .InstancePerLifetimeScope();

    builder.RegisterGeneric(typeof(AccountingRepository<>))
        .As(typeof(IRepository<>))
        .As(typeof(IReadRepository<>))
        .InstancePerLifetimeScope();
.
.
.
}

我的 AppDbContext 是这样的：

public class AppDbContext : DbContext
{
  private readonly IMediator? _mediator;

  public AppDbContext(DbContextOptions<AppDbContext> options, IMediator? mediator)
      : base(options)
  {
    _mediator = mediator;
  }

  public DbSet<ToDoItem> ToDoItems => Set<ToDoItem>();
  public DbSet<Project> Projects => Set<Project>();
.
.
.
}

如何解决这个异常， 请注意，我想处理 3 个源数据库。

Answer 1

最后，我通过将 MySql.EntityFrameworkCore 包更改为 Pomelo.EntityFrameworkCore.MySql 来修复它，它成功地工作了。