.Net动态生成controller遇到的坑

public class TestController : QueryRepController<int?, TestEntity, TestEntityGet>
{
    public TestController(IQueryRepository<int?, TestEntity> repository) : base(repository)
    {
    }
}

services.AddQueryRepController<int?, TestEntity, TestEntityGet>("Test");

public static IServiceCollection AddQueryRepController<TKey, T, GetT>(this IServiceCollection services, string route)
where T : class, IBaseEntity<TKey> where GetT : IBaseGet<T>
{
    // 建一个 Assembly
    AssemblyBuilder Ass = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName("NewController"), AssemblyBuilderAccess.Run);
    ModuleBuilder MB = Ass.DefineDynamicModule("NewController");
    // 起个好听的名字
    var typeName = $"{route}Controller";
    // 使用QueryRepController<TKey, T, GetT>整一个builder
    var typeBuilder = MB.DefineType(typeName, TypeAttributes.Class | TypeAttributes.Public, typeof(QueryRepController<TKey, T, GetT>), null);
    // 添加一个构造函数,
    var ctor = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard | CallingConventions.HasThis, new[] { typeof(IQueryRepository<TKey, T>) });
    // 给这个构造函数编IL
    var ilGenerator = ctor.GetILGenerator();
    // 通过ILSpy反编译,然后抄il
    ilGenerator.Emit(OpCodes.Ldarg, 0);
    ilGenerator.Emit(OpCodes.Ldarg, 1);
    ilGenerator.Emit(OpCodes.Call, typeof(QueryRepController<TKey, T, GetT>).GetConstructors()[0]);
    ilGenerator.Emit(OpCodes.Nop);
    ilGenerator.Emit(OpCodes.Ret);
    // 创建这个新的 type
    var type = typeBuilder.CreateType();
    // 根据自己的情况注册到容器中
    services.AddTransient(typeof(IQueryController<TKey, T, GetT>), type);
    return services;
}

services.AddQueryRepController<int?, TestEntity, TestEntityGet>("Test")

public class AddControllerChangeProvider : IActionDescriptorChangeProvider
{
    public static AddControllerChangeProvider Instance { get; } = new AddControllerChangeProvider();
    public CancellationTokenSource TokenSource { get; private set; }
    public bool HasChanged { get; set; }
    public IChangeToken GetChangeToken()
    {
        TokenSource = new CancellationTokenSource();
        return new CancellationChangeToken(TokenSource.Token);
    }
}

public class ChangeActionService : IHostedService
{
    private readonly ApplicationPartManager Part;
    public ChangeActionService(IServiceScopeFactory scope)
    {
        Part = scope.CreateScope().ServiceProvider.GetService<ApplicationPartManager>();
    }
    public async Task StartAsync(CancellationToken cancellationToken)
        Part.ApplicationParts.Add(new AssemblyPart( <可以直接使用之前的AssemblyBuilder> ));
        AddControllerChangeProvider.Instance.HasChanged = true;
        AddControllerChangeProvider.Instance.TokenSource.Cancel();
        await Task.CompletedTask;

    public async Task StopAsync(CancellationToken cancellationToken)
}

services.AddSingleton<IActionDescriptorChangeProvider>(AddControllerChangeProvider.Instance);
services.AddHostedService<ChangeActionService>();

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddMysql<TestDbContext>("localhost", 3306, "test", "root", "pwd")
// 将 TestDbContext 注册为默认的 DbContext
.AddDefaultDbContext<TestDbContext>()
.AddControllers();
builder.Services
// 注册一个 TestController
.AddQueryRepController<long?, TestEntity, TestEntityGet>("Test")
// 带注释的 Swagger
.AddSwaggerWithComments();
var app = builder.Build();
app.UseSwagger().UseSwaggerUI();
app.MapControllers();
app.Run();
public class TestDbContext : DbContext
{
    public DbSet<TestEntity> Tests { get; set; }
    public TestDbContext(DbContextOptions<TestDbContext> options) : base(options)
    { }
}
// 对应数据库中的 Test 表
public class TestEntity : BaseEntity<long?>
    public string Code { get; set; }
    public int? Number { get; set; }
    public bool? IsTest { get; set; }
// 对应 TestEntity 的 TestEntityGet, 决定接口的查询规则
public class TestEntityGet : BaseGet<TestEntity>
    public string? Code { get; set; }