配置Visual Studio SDK后，App Insights门户未显示ASP.NET Web API请求

我有一个目标框架为.NET 4.8的ASP.NET Web API项目，该项目额外添加了ASP.NET Core的ConfigureServices及Startup.cs文件，使用app.config进行配置。我已在Azure门户创建App Insights资源，安装了Microsoft.ApplicationInsights.AspNetCore NuGet包，并将该资源的Instrumentation Key配置到app.config中。但使用Postman向API发送请求后，App Insights门户并未显示对应的请求及探查器数据。

相关代码 #

Startup.cs

/*
 * API
 *
 * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
 *
 * The version of the OpenAPI document: 1.0.0
 * 
 * Generated by: https://openapi-generator.tech
 */

using System;
using System.IO;
using System.Reflection;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Serialization;
using Swashbuckle.AspNetCore.Swagger;
using Swashbuckle.AspNetCore.SwaggerGen;
using Microsoft.AspNetCore.Authorization;
using Microsoft.IdentityModel.Tokens;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using System.Text;
using System.Linq;
using Microsoft.ApplicationInsights.Extensibility;
using System.Web.Configuration;

namespace MyNamespace
{
    /// <summary>
    /// Startup
    /// </summary>
    public class Startup
    {
        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="configuration"></param>
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        /// <summary>
            /// The application configuration.
        /// </summary>
        public IConfiguration Configuration { get; }

        /// <summary>
        /// This method gets called by the runtime. Use this method to add services to the container.
        /// </summary>
        /// <param name="services"></param>
        public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.

            services.AddCors(options => 
            {
                options.AddDefaultPolicy(
                    builder =>
                    {
                        builder
                            .WithExposedHeaders("Wtoken")
                            .AllowAnyOrigin()
                            .AllowAnyHeader()
                            .AllowAnyMethod();
                    });
            });
            TelemetryConfiguration.Active.InstrumentationKey = WebConfigurationManager.AppSettings["InstrumentationKey"];
            services.AddApplicationInsightsTelemetry(Configuration);
            
            
            var secretKey = System.Configuration.ConfigurationManager.AppSettings["TokenSecret"];
            
            //var issuer = System.Configuration.ConfigurationManager.AppSettings["Issuer"];
            //var audience = System.Configuration.ConfigurationManager.AppSettings["Audience"];

            services
                .AddAuthentication(opt =>
                {
                    opt.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                    opt.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
                    opt.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
                })
                .AddJwtBearer(x =>
                {
                    x.RequireHttpsMetadata = false;
                    x.SaveToken = true;
                    x.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidIssuer = System.Configuration.ConfigurationManager.AppSettings["Issuer"],
                        ValidAudience = System.Configuration.ConfigurationManager.AppSettings["Audience"],

                        ValidateIssuer = true,
                        ValidateAudience = true,
                        ValidateLifetime = true,
                        ValidateIssuerSigningKey = true,

                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(secretKey)),
                    };
                });


            

            services
                .AddMvc(opts => {
                    
                    opts.InputFormatters.Insert(0, new InputFormatterStream());
                    })
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_1)
                .AddJsonOptions(opts =>
                {
                    opts.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
                    opts.SerializerSettings.Converters.Add(new StringEnumConverter
                    {
                        CamelCaseText = true
                    });
                });

            services
                .AddSwaggerGen(c =>
                {
                    c.SwaggerDoc("1.0.0", new Info
                    {
                        Version = "1.0.0",
                        Title = "API",
                        Description = "API (ASP.NET Core 2.1)",
                       TermsOfService = ""
                    });
                    c.CustomSchemaIds(type => type.FriendlyId(true));
                    c.DescribeAllEnumsAsStrings();
                    c.IncludeXmlComments($"{AppContext.BaseDirectory}{Path.DirectorySeparatorChar}{Assembly.GetEntryAssembly().GetName().Name}.xml");

                    
                    c.OperationFilter<GeneratePathParamsValidationFilter>();
                });
        }

        /// <summary>
        /// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        /// </summary>
        /// <param name="app"></param>
        /// <param name="env"></param>
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            app.UseHttpsRedirection();
            app
                .UseCors()
                .UseMvc()
                .UseDefaultFiles()
                .UseStaticFiles()
                .UseSwagger(c =>
                {
                    c.RouteTemplate = "swagger/{documentName}/openapi.json";
                })
                .UseSwaggerUI(c =>
                {
                    //TODO: Either use the SwaggerGen generated Swagger contract (generated from C# classes)
                    c.SwaggerEndpoint("/swagger/1.0.0/openapi.json", "API");

                    //TODO: Or alternatively use the original Swagger contract that's included in the static files
                    // c.SwaggerEndpoint("/openapi-original.json", "API Original");
                });
            app.UseApplicationInsightsRequestTelemetry();
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseHsts();
            }
        }
    }
}

App.Config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
   </configSections>
  <appSettings>

    
    <add key="EFConnstringKey" value=""/>  
    <!-- settings below here are global -->
      <add key="InstrumentationKey" value="27bafd84450"/>
    <add key="SmtpServer" value=""/>

    <add key="TokenSecret" value=" "/>
    <add key="Issuer" value=" "/>

    <add key="Audience" value=" "/>

    <add key=" " value=" "/>
    <add key=" " value=" "/>
  </appSettings>
  <connectionStrings>
    <!-- leaving as sample, not used in code. 'connectionString' value is stored in connstring manager after replacing &quot; with ' -->
   </connectionStrings>
  
  <runtime>
    <gcServer enabled="true"/>
  </runtime>
</configuration>

1. 替换适配的NuGet包 #

你的项目是基于.NET Framework 4.8的ASP.NET Web API，Microsoft.ApplicationInsights.AspNetCore是为纯ASP.NET Core项目设计的，需替换为.NET Framework专用包：

• 卸载Microsoft.ApplicationInsights.AspNetCore
• 安装Microsoft.ApplicationInsights.Web（最新稳定版）

2. 修正配置读取逻辑 #

ASP.NET Core的IConfiguration默认不会自动加载app.config，需手动配置加载该文件，同时修正Telemetry初始化：

public Startup(IConfiguration configuration)
{
    // 将app.config加载到IConfiguration中
    var builder = new ConfigurationBuilder()
        .AddConfiguration(configuration)
        .AddXmlFile("app.config", optional: false, reloadOnChange: true);
    Configuration = builder.Build();
}

public void ConfigureServices(IServiceCollection services)
{
    // ... 保留Cors、认证等原有代码 ...

    // 移除原有的TelemetryConfiguration.Active设置，改用以下方式初始化
    services.AddApplicationInsightsTelemetry(options =>
    {
        options.InstrumentationKey = Configuration["appSettings:InstrumentationKey"];
    });

    // ... 保留Mvc、Swagger等原有代码 ...
}

3. 调整中间件顺序 #

UseApplicationInsightsRequestTelemetry必须放在UseMvc之前，才能捕获完整的请求链路：

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseHsts();
    }

    app.UseHttpsRedirection();
    app.UseApplicationInsightsRequestTelemetry(); // 移至UseMvc之前
    app.UseCors();
    app.UseMvc();
    
    // 静态文件、Swagger等中间件放在UseMvc之后
    app.UseDefaultFiles()
       .UseStaticFiles()
       .UseSwagger(c =>
       {
           c.RouteTemplate = "swagger/{documentName}/openapi.json";
       })
       .UseSwaggerUI(c =>
       {
           c.SwaggerEndpoint("/swagger/1.0.0/openapi.json", "API");
       });
}

4. 补全Instrumentation Key #

当前app.config中的27bafd84450不完整，Instrumentation Key应为32位GUID格式（如27bafd84-xxxx-xxxx-xxxx-xxxx450xxxx），需替换为Azure门户中App Insights资源的完整密钥。

5. 启用探查器 #

若需获取探查器数据：

• 在Azure门户的App Insights资源中，进入性能 > 探查器开启功能
• 若项目依赖ASP.NET Core中间件，安装Microsoft.ApplicationInsights.Profiler.AspNetCore包
• 纯.NET Framework场景，可在对应App Service的诊断设置中开启传统探查器

验证步骤 #

1. 清理并重新生成项目
2. 启动API，用Postman发送测试请求
3. 等待5-10分钟（Application Insights数据存在延迟），查看Azure门户的日志 > 跟踪或性能 > 请求页面确认数据是否上报

内容的提问来源于stack exchange，提问作者user575219