Asp.net核心2.0中间件 - 访问配置设置

Question

在asp.net核心web api中间件中,是否可以访问中间件内的配置？有人可以指导我如何做到这一点？

Answer 1

在middle-ware您可以访问设置.要做到这一点,你需要得到IOptions<AppSettings>的middle-ware构造.见以下样本.

public static class HelloWorldMiddlewareExtensions
{
    public static IApplicationBuilder UseHelloWorld(
        this IApplicationBuilder builder)
    {
        return builder.UseMiddleware<HelloWorldMiddleware>();
    }
}

public class HelloWorldMiddleware
{
    private readonly RequestDelegate _next;
    private readonly AppSettings _settings;

    public HelloWorldMiddleware(
        RequestDelegate next,
        IOptions<AppSettings> options)
    {
        _next = next;
        _settings = options.Value;
    }

    public async Task Invoke(HttpContext context)
    {
        await context.Response.WriteAsync($"PropA: {_settings.PropA}");
    }
}

public class AppSettings
{
    public string PropA { get; set; }
}

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