Question

我问自己是否可以在运行时加载带有Controller的DLL并使用它。

我找到的唯一解决方案是通过ApplicationPart上的StartUp添加一个程序集：

var builder = services.AddMvc();
builder.AddApplicationPart(
    AssemblyLoadContext.Default.LoadFromAssemblyPath(
        @"PATH\ExternalControllers.dll"
));

有人知道是否可以随时注册Controller，因为该解决方案的问题是，当您想要添加WebService时，必须重新启动Controller 1}}在里面。如果您可以随时添加它们并在应用程序中随时注册它们，那就太好了。

Answer 1

现在可以在.net core 2.0 +

上使用

请参阅代码ActionDescriptorCollectionProvider.cs：

    public ActionDescriptorCollectionProvider(
        IEnumerable<IActionDescriptorProvider> actionDescriptorProviders,
        IEnumerable<IActionDescriptorChangeProvider> actionDescriptorChangeProviders)
    {
        _actionDescriptorProviders = actionDescriptorProviders
            .OrderBy(p => p.Order)
            .ToArray();

        _actionDescriptorChangeProviders = actionDescriptorChangeProviders.ToArray();

        ChangeToken.OnChange(
            GetCompositeChangeToken,
            UpdateCollection);
    }

第1步：实施IActionDescriptorChangeProvider类：

public class MyActionDescriptorChangeProvider : IActionDescriptorChangeProvider
{
    public static MyActionDescriptorChangeProvider Instance { get; } = new MyActionDescriptorChangeProvider();

    public CancellationTokenSource TokenSource { get; private set; }

    public bool HasChanged { get; set; }

    public IChangeToken GetChangeToken()
    {
        TokenSource = new CancellationTokenSource();
        return new CancellationChangeToken(TokenSource.Token);
    }
}

步骤2：在Startup.ConfigureServices（）上添加AddSingleton：

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc();
    services.AddSingleton<IActionDescriptorChangeProvider>(MyActionDescriptorChangeProvider.Instance);
    services.AddSingleton(MyActionDescriptorChangeProvider.Instance);
}

步骤3：在运行时注册控制器：

public class TestController : Controller
{
    private readonly ApplicationPartManager _partManager;
    private readonly IHostingEnvironment _hostingEnvironment;
    public TestController(
        ApplicationPartManager partManager,
        IHostingEnvironment env)
    {
        _partManager = partManager;
        _hostingEnvironment = env;
    }
    public IActionResult RegisterControllerAtRuntime()
    {
        string assemblyPath = @"PATH\ExternalControllers.dll";
        var assembly = AssemblyLoadContext.Default.LoadFromAssemblyPath(assemblyPath);
        if (assembly != null)
        {
            _partManager.ApplicationParts.Add(new AssemblyPart(assembly));
            // Notify change
            MyActionDescriptorChangeProvider.Instance.HasChanged = true;
            MyActionDescriptorChangeProvider.Instance.TokenSource.Cancel();
            return Content("1");
        }
        return Content("0");
    }
}

Answer 2

现在可以。

请参阅有关how to add dynamic controllers的最新文档：

/task:0

ASP.Net核心寄存器控制器在运行时

2 个答案: