C＃使用lambda表达式将参数传递给方法(C# Pass parameter to method using lambda expression)

 任何使用ASP.Net的人都可能看到接受用于配置某些选项的Action<T>委托的方法。 以ASP.Net Core MVC Startup.cs中的这个例子为例。 
 
public void ConfigureServices(IServiceCollection services)
{
    services.AddAuthentication().AddJwtBearer(options => {
        options.Audience = "something";
        // ...
    });

    //...
}
 
 .AddJwtBearer()方法在lambda表达式中接受一个带有配置参数的Action<T>委托，我试图做的是在我的一个项目中复制它，但没有运气。 我得到了Method(Action<T> action)部分，但我似乎无法检索调用该方法时配置的结果对象。 
 
 上下文的一些代码： 
 
 构建器类的方法： 
 
public ReporterBuilder SetEmail(Action<EmailConfig> config)
{
    if (config is null)
        throw new ArgumentNullException();

    // Get configured EmailConfig somehow...

    return this;
}
 
 EmailConfig模型： 
 
public class EmailConfig
{
    public EmailProvider EmailProvider { get; set; }
    public string Host { get; set; }
    public int Port { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
    public string FromAddress { get; set; }
    public string ToAddress { get; set; }
}
 
 所以我想在这里实现的是这样的： 
 
Reporter reporter = new ReporterBuilder()
    .SetEmail(config => {
        config.EmailProvider = EmailProvider.Other;
        config.Host = "something";
        // ...
    })
    .Build();
 
 我查看了GitHub上的一些微软存储库（aspnet / DependencyInjection，aspnet / Options被看作是两个主要的使用它们的IoC容器的方法），看看它们如何从Action<T>代理中获取值，绝对是绝对的没有运气。 
 
 几个小时在互联网上搜索也没有帮助，因为大多数文章已经过时，或者与我试图做的事情无关。 
 
 我非常欢迎任何关于如何完成这项工作的帮助，同时也欢迎有关如何更好地完成这项工作的建议。 

Anyone that used ASP.Net might have seen methods that accept an Action<T> delegate that is used to configure some options. Take this one as an example in a ASP.Net Core MVC Startup.cs.
 
public void ConfigureServices(IServiceCollection services)
{
    services.AddAuthentication().AddJwtBearer(options => {
        options.Audience = "something";
        // ...
    });

    //...
}
 
The .AddJwtBearer() method takes an Action<T> delegate with the configured parameters inside the lambda expression, what I'm trying to do is replicate that in one of my projects, but with no luck. I got the Method(Action<T> action) part down, but I can't seem to retrieve the resulting object that was configured when the method was called.
 
Some code for context:
 
The builder class method:
 
public ReporterBuilder SetEmail(Action<EmailConfig> config)
{
    if (config is null)
        throw new ArgumentNullException();

    // Get configured EmailConfig somehow...

    return this;
}
 
The EmailConfig model:
 
public class EmailConfig
{
    public EmailProvider EmailProvider { get; set; }
    public string Host { get; set; }
    public int Port { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
    public string FromAddress { get; set; }
    public string ToAddress { get; set; }
}
 
So what I'm trying to achieve here is this:
 
Reporter reporter = new ReporterBuilder()
    .SetEmail(config => {
        config.EmailProvider = EmailProvider.Other;
        config.Host = "something";
        // ...
    })
    .Build();
 
I looked at some Microsoft repositories on GitHub (aspnet/DependencyInjection, aspnet/Options seen to be the two main ones that use this approach with their IoC container) to see how they do to grab values from an Action<T> delegate, with absolutely no luck.
 
A few hours search on the internets didn't help either, as most articles are outdated or had nothing to do with what I'm trying to do.
 
Any help on how I can make this work is very welcome, also suggestions on better ways this can be done are also welcome.

原文：https://stackoverflow.com/questions/50911110