如何在 .NET 6 的 program.cs 中，在 builder.Build() 之前使用 Logger [重复]

在.NET 6中使用默认的WebAPI框架VS2022。我想使用ILogger记录信息，但在调用“var app = builder.Build();".

是否可以检索“新配置的记录器”buider.Host.ConfigureLogging(logging =>”来自“WebApplication”对象、WebApplicationBuilder 对象、builder.Host 对象或任何其他对象？

这是program.cs的代码

var builder = WebApplication.CreateBuilder(args);

string insightConnectionString = Environment.GetEnvironmentVariable("APPLICATIONINSIGHTS_CONNECTION_STRING");

builder.Host.ConfigureLogging(logging =>
{
    logging.ClearProviders();
    logging.AddApplicationInsights(insightConnectionString);
    logging.AddConsole();
});

// -----> I want to log information here, before the call of "var app = builder.Build();" <-----

builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

// -----> And I want to log information here, before the call of "var app = builder.Build();" <-----

var app = builder.Build();

app.Logger.LogInformation("Log some information #1");

//...

app.Logger.LogInformation("Log some information #2");

app.Run();

您可以手动创建LoggerFactory and Logger:

using var loggerFactory = LoggerFactory.Create(loggingBuilder => loggingBuilder
    .SetMinimumLevel(LogLevel.Trace)
    .AddConsole());

ILogger logger = loggerFactory.CreateLogger<Program>();
logger.LogInformation("Example log message");