.NET 6.0控制台应用启动时Serilog对接Azure Application Insights抛异常

问题根源 #

异常提示找不到Serilog.Sinks.ApplicationInsights.Sinks.ApplicationInsights.TelemetryConverters.TraceTelemetryConverter类型，核心原因是配置文件中TelemetryConverter的命名空间路径错误，存在重复的Sinks.ApplicationInsights段；同时需确认项目已正确安装相关依赖包。

解决方案 #

1. 修正appsettings.json中的TelemetryConverter配置 #

打开appsettings.json，定位到Serilog的Application Insights接收器配置，将TelemetryConverter的类型路径修改为正确格式：

"TelemetryConverter": "Serilog.Sinks.ApplicationInsights.TelemetryConverters.TraceTelemetryConverter, Serilog.Sinks.ApplicationInsights"

（原配置多嵌套了一层Sinks.ApplicationInsights，导致类型查找失败）

2. 确认安装必要的NuGet包 #

确保项目已安装以下兼容版本的NuGet包：

• Serilog
• Serilog.Sinks.Console
• Serilog.Sinks.ApplicationInsights
• Serilog.Settings.Configuration
• Microsoft.Extensions.Configuration.Json
• Microsoft.Extensions.DependencyInjection
• Microsoft.Extensions.Logging

可通过Package Manager Console执行安装命令：

Install-Package Serilog
Install-Package Serilog.Sinks.Console
Install-Package Serilog.Sinks.ApplicationInsights
Install-Package Serilog.Settings.Configuration
Install-Package Microsoft.Extensions.Configuration.Json
Install-Package Microsoft.Extensions.DependencyInjection
Install-Package Microsoft.Extensions.Logging

3. 优化Program.cs代码（可选） #

针对.NET 6控制台应用的顶级语句特性，可简化代码并优化日志初始化流程：

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Serilog;

Console.WriteLine("Hello, World!");

// 加载配置文件
var configuration = new ConfigurationBuilder()
    .AddJsonFile("appsettings.json")
    .Build();

// 初始化Serilog日志实例
Log.Logger = new LoggerConfiguration()
    .ReadFrom.Configuration(configuration)
    .CreateLogger();

try
{
    // 构建依赖注入容器
    var services = new ServiceCollection();
    services.AddLogging(configure => configure.AddSerilog())
            .AddTransient<Program>();

    services.Configure<LoggerFilterOptions>(options => options.MinLevel = LogLevel.Debug);

    var serviceProvider = services.BuildServiceProvider();
    var logger = serviceProvider.GetRequiredService<ILogger<Program>>();
    logger.LogInformation("Logger initialized!");
}
catch (Exception ex)
{
    Log.Fatal(ex, "Application terminated unexpectedly");
}
finally
{
    Log.CloseAndFlush();
}

// 用于承载泛型日志的临时类
public class Program { }

验证 #

修改完成后重新运行项目，类型找不到的异常会消失，日志将同时输出到控制台和Azure Application Insights。

内容的提问来源于stack exchange，提问作者ossentoo