在ConfigureServices中注入依赖项

Question

在我的ASP.Net Core应用程序中,我需要在方法中注入一些依赖项(在我的例子中是一个存储库)ConfigureServices.

问题是该方法不允许使用多个参数来注入依赖项.该怎么做？

这是我的代码

public void ConfigureServices(IServiceCollection services)
{
    services.AddOptions();

    // ... 
    services.AddSingleton<ITableRepositories, TableClientOperationsService>();

    // Add framework services.
    services.AddOpenIdConnect(options =>
    {
        // options.ClientId = ...
        options.Events = new OpenIdConnectEvents
        {
            OnTicketReceived = async context =>
            {
                var user = (ClaimsIdentity)context.Principal.Identity;
                if (user.IsAuthenticated)
                {
                    // ... 
                    // vvv 
                    // HERE, I need the ITableRepositories repository; 
                    // vvv
                    var myUser = await repository.GetAsync<Connection>(userId);
                    // ... 
                }
                return;
            }
        };
    });
}

我怎样才能在这里注入依赖？

编辑:

遵循克里斯的想法(吼叫),这似乎有效:

public class Startup
{
    // private repository, used in ConfigureServices, initialized in Startup
    ITableRepositories repository;

    public Startup(IHostingEnvironment env)
    {
        var builder = new ConfigurationBuilder()
        // ... etc etc
        Configuration = builder.Build();

        // init repository here
        this.repository = new TableClientOperationsService();
    }

Answer 1

您可以通过HttpContext.RequestServices当前上下文访问服务容器.

public void ConfigureServices(IServiceCollection services) {
    services.AddOptions();

    // ... 
    services.AddSingleton<ITableRepositories, TableClientOperationsService>();

    // Add framework services.
    services.AddOpenIdConnect(options => {
        // options.ClientId = ...
        options.Events = new OpenIdConnectEvents {
            OnTicketReceived = async context => {
                var user = (ClaimsIdentity)context.Principal.Identity;
                if (user.IsAuthenticated) {
                    // ... 

                    // get the ITableRepositories repository
                    var repository = context.HttpContext.RequestServices.GetService<ITableRepositories>();
                    var myUser = await repository.GetAsync<Connection>(userId);

                    // ... 
                }
                return;
            }
        };
    });
}

因此从技术上讲,您不需要访问其中的依赖项,ConfigureServices因为内联表达式可以提取到自己的函数中.

public void ConfigureServices(IServiceCollection services) {
    services.AddOptions();

    // ... 
    services.AddSingleton<ITableRepositories, TableClientOperationsService>();

    // Add framework services.
    services.AddOpenIdConnect(options => {
        // options.ClientId = ...
        options.Events = new OpenIdConnectEvents {
            OnTicketReceived = TicketReceived
        };
    });
}

private async Task TicketReceived(TicketReceivedContext context) {
    var user = (ClaimsIdentity)context.Principal.Identity;
    if (user.IsAuthenticated) {
        // ... 

        // get the ITableRepositories repository
        var repository = context.HttpContext.RequestServices.GetService<ITableRepositories>();
        var myUser = await repository.GetAsync<Connection>(userId);

        // ... 
    }
    return;
}