自定义中间件

中间件是一种装配到应用管道以处理请求和响应的软件。
通常，中间件封装在类中，并且通过扩展方法公开。

约定模式

自定义类-扩展-注册

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using System;
using System.Diagnostics;
using System.Threading.Tasks;
/// <summary>
/// 访问接口耗时
/// </summary>
public class CustomInvokeElapseTime
{
    private readonly RequestDelegate _next;
    private readonly ILogger _logger;
    private readonly Stopwatch _stopwatch;

    public CustomInvokeElapseTime(RequestDelegate next)
    {
        _next = next;
        _stopwatch = new Stopwatch();
    }
    public CustomInvokeElapseTime(RequestDelegate next, ILogger logger) : this(next)
    {
        _logger = logger;
    }
    public async Task InvokeAsync(HttpContext context)
    {
        _stopwatch.Restart();
        context.Response.OnCompleted(() =>
        {
            _stopwatch.Stop();
#if DEBUG
            Console.WriteLine($"ElaspedTime:{_stopwatch.ElapsedMilliseconds} ms");
            _logger.LogInformation($"执行耗时:{_stopwatch.ElapsedMilliseconds} ms");
#endif
            return Task.CompletedTask;
        });
        await _next(context);
    }
}
/// <summary>
/// 扩展中间件
/// </summary>
public static class CustomInvokeElapseTimeExtensions
{
    public static IApplicationBuilder UseCustomInvokeElapseTime(this IApplicationBuilder app)
    {
        return app.UseMiddleware<CustomInvokeElapseTime>();
    }
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILogger<Startup> logger)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.UseHttpsRedirection();
    app.UseStaticFiles();
    app.UseCookiePolicy();
    app.UseRouting();
    app.UseAuthentication();
    app.UseAuthorization();
    app.UseSession();

    logger.LogInformation("自定义中间件添加到管道中");
    app.UseCustomInvokeElapseTime();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });

    app.UseSwagger();
    app.UseSwaggerUI(c =>
    {
        c.SwaggerEndpoint("/swagger/v1/swagger.json", "XXX.dll");
    });
}

基于工厂

第三方容器