如何在 ASP.NET Core 5.0 中忽略对 favicon.ico 的请求？

问题描述

启动：

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddTransient<RandomCounter>();

        services.AddTransient<ICounter>(provider =>
        {
            var counter = provider.GetService<RandomCounter>();
            return counter;
        });

        services.AddTransient<CounterService>();
    }

    public void Configure(IApplicationBuilder app)
    {
        app.UseMiddleware<CounterMiddleware>();

    }
}

对于每个新请求，计数器增加 2。我希望每次新调用计数器增加 1。在这种情况下我该怎么办？或者在这里我只需要为每个新请求添加一个条件：？

中间件：

 using Dependency.Services;
    using Microsoft.AspNetCore.Http;
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;
    
    namespace Dependency
    {
        public class CounterMiddleware
        {
            private readonly RequestDelegate _next;
    
            private int i = 0;
    
            public CounterMiddleware(RequestDelegate next)
            {
                _next = next;
            }
    
            public async Task InvokeAsync(HttpContext httpContext,ICounter counter,CounterService counterService)
            {
                i++;
                httpContext.Response.ContentType = "text/html; charset=utf-8";
                await httpContext.Response.WriteAsync($"Request {i}; Counter: {counter.Value}; Service: {counterService.Counter.Value}");
            }
        }
    }

解决方法

    public async Task InvokeAsync(HttpContext httpContext,ICounter counter,CounterService counterService)
    {
        if (httpContext.Request.Path.HasValue && !httpContext.Request.Path.Value.StartsWith("/favicon.ico"))
        {
            i++;
            httpContext.Response.ContentType = "text/html; charset=utf-8";
            await httpContext.Response.WriteAsync($"Request {i}; Counter: {counter.Value}; Service: {counterService.Counter.Value}");
        }

    }