将数据传递给 startup.cs [英] Pass data to startup.cs

问题描述

如何将数据传递到 startup.cs 中?

How do you pass data into startup.cs ?

这是使用 WebHostBuilder 和 TestServer

我需要根据测试夹具传递不同的数据.所以不想从配置文件中拉进来，例如

I need to pass different data depending on the Test Fixture. So dont want to pull it in from a config file, for example

数据将提供给startup.cs中注册的中间件

The data will be supplied to a registered Middleware in startup.cs

文档似乎表明这应该有效:

Docs seem to suggest this should work:

var configBuilder = new ConfigurationBuilder()
                .AddInMemoryCollection(new[]
                {
                    new KeyValuePair<string, string>("key", "value"),
                });

            var configuration = configBuilder.Build();

            var host = new WebHostBuilder()
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseConfiguration(configuration) // config added here
                .UseStartup<Startup>()
                .Build();

            host.Run();

但是当我检查 startup.cs 中的 Configuration 对象时，密钥不存在.并且只有在 startup.cs 中定义的提供程序可用.

but when I inspect the Configuration object in startup.cs, the key is not present. And only the providers defined in startup.cs are available.

我目前正尝试在 program.cs 中执行此操作以测试概念，然后将转向集成测试

I am trying to do this in program.cs at the moment to test the concept, then will move to integration tests later

知道我做错了什么吗?

是否有更好的方法将数据传递到启动中?

Is there a better way to pass data into startup?

推荐答案

将数据发送到 Startup 的一种方法是在 Main 中注册服务.WebHostBuilder 有 ConfigureServices 方法，可以像在 Startup 类中实现的 ConfigureServices 方法一样使用.

One way to send data into the Startup would be to register a service in Main. WebHostBuilder has ConfigureServices method which can be used just like the ConfigureServices method you can implement in the Startup class.

例如，您可以使用静态变量创建一个类(这不是最好的主意，但有效)

For example you can make a class with static variables (not the best idea but works)

public class DataContainer
{
   public static string Test;
}

然后设置其值并将其添加为单例服务

Then set its values and add it as a singleton service

DataContainer.Test = "testing";

var host = new WebHostBuilder()
            .ConfigureServices(s => { s.AddSingleton(typeof(DataContainer)); })
            .UseKestrel()
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseConfiguration(configuration) // config added here
            .UseStartup<Startup>()
            .Build();

在此之后，您的Startup 可以使用常规注入方式来获取此

After this your Startup can just use the regular injection way to get this

public Startup(IHostingEnvironment env, DataContainer data)
{
  // data.Test is available here and has the value that has been set in Main
}

注入当然适用于此后的任何类和方法，而不仅仅是构造函数.

The injection of course works in any class and method after this, not just the constructor.

我不确定这是否比实际创建一个具有静态值的类本身更好，但如果该类有时需要更改，则可以将其制成接口和其他常见的注入好处.

I'm not sure if this is any better than to actually create a class with static values by itself but if the class needs to be changed sometimes it can be made into an interface and the other usual injection benefits.

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