DependencyInjection 找不到程序集

Question

我有两个 dll WebApp 和 MyUtils.EntityFramework 它们都在同一目录中并且 WebApp 引用 MyUtils.EntityFramework.

这是 WebApp 的样子

public class Program
{
    public static void Main()
    {
        var appServiceProivder = new ServiceCollection()
            .AddDbContext<DerivedContext1>()
            .BuildServiceProvider();

        using (var serviceScope = appServiceProivder
            .GetRequiredService<IServiceScopeFactory>()
            .CreateScope())
        {
            var context = serviceScope.ServiceProvider.GetService<DerivedContext1>();

            Debug.Assert(context.GetService<IDbContextOptions>()
                .GetType() == typeof(DbContextOptions<DerivedContext1>));
        }
    }
}

[DbSchema("test")]
public class DerivedContext1 : DbContext
{
    public DerivedContext1(DbContextOptions options) : base(options) { }

    protected override void OnConfiguring(DbContextOptionsBuilder builder)
    {
        builder.UseSqlServer("secret connection string");
        builder.ReplaceService<IHistoryRepository, 
            MigrationHistoryRepository<DerivedContext1>>();
    }
}

这就是 MyUtils.EntityFramework 的样子

public class DbSchemaAttribute : Attribute
{
    public DbSchemaAttribute(string name)
    {
        Name = name;
    }

    public string Name { get; private set; }
}

public class MigrationHistoryRepository<TDbContext>
    : SqlServerHistoryRepository where TDbContext : DbContext
{
    public MigrationHistoryRepository(HistoryRepositoryDependencies dependencies)
        : base(dependencies)
    {
    }

    protected override string TableName { get { return "migration_history"; } }

    protected override string TableSchema
    {
        get
        {
            var dsSchemaAttr = typeof(TDbContext)
                .GetCustomAttributes(typeof(DbSchemaAttribute), true)
                    .SingleOrDefault() as DbSchemaAttribute;

            if (dsSchemaAttr != null)
                return dsSchemaAttr.Name;

            return null;
        }
    }

    protected override void ConfigureTable(EntityTypeBuilder<HistoryRow> history)
    {
        base.ConfigureTable(history);

        history.HasKey(h => h.MigrationId).HasName($"{TableName}_pkey");
        history.Property(h => h.MigrationId).HasColumnName("id");
        history.Property(h => h.ProductVersion).HasColumnName("product_version");
    }
}

这是我因为这一行而得到的错误

builder.ReplaceService<IHistoryRepository, MigrationHistoryRepository<DerivedContext1>>();

bin 输出包含两个 dll，所以我不明白问题出在哪里（我使用的是 fedora 33）

An unhandled exception of type 'System.IO.FileNotFoundException' occurred in Microsoft.EntityFrameworkCore.dll: 'Could not load file or assembly 'MyUtils.EntityFramework, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.'
   at WebApp.DerivedContext1.OnConfiguring(DbContextOptionsBuilder builder) in /src/api/Program.cs:line 92
   at Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider()
   at Microsoft.EntityFrameworkCore.DbContext.Microsoft.EntityFrameworkCore.Infrastructure.IInfrastructure<System.IServiceProvider>.get_Instance()
   at Microsoft.EntityFrameworkCore.Infrastructure.Internal.InfrastructureExtensions.GetService[TService](IInfrastructure`1 accessor)
   at Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService[TService](IInfrastructure`1 accessor)
   at WebApp.Program.Main() in /src/api/Program.cs:line 78

Answer 1

因为efcore utils被多次编译，这里更详细How to organize multiple git packages in dotnet core

DependencyInjection 找不到程序集

DependencyInjection cannot find the assembly

entity-framework

dependency-injection

filenotfoundexception

.net-core