使用Serilog进行Blazor应用程序日志记录

Question

在blazor应用程序中，我在main中配置了启动日志，如下所示；

public static void Main(string[] args)
{
var assembly = Assembly.GetExecutingAssembly().GetName();
var appInsightsTelemetryConfiguration = TelemetryConfiguration.CreateDefault();
appInsightsTelemetryConfiguration.InstrumentationKey = "aa11aa11aa-a1a1-a1-aa-a111-aa11";
Log.Logger = new LoggerConfiguration()
.MinimumLevel.Override("Microsoft.AspNetCore", Serilog.Events.LogEventLevel.Warning)
.Enrich.FromLogContext()
.Enrich.WithProperty("Application", $"{assembly.Name}")
.WriteTo.Console()          
.WriteTo.Seq(serverUrl: "http://myseqserver.inthecloud.azurecontainer.io:5341/") 
.WriteTo.ApplicationInsights(appInsightsTelemetryConfiguration, TelemetryConverter.Traces)
.CreateLogger();
try
{
Log.Information(Constants.Logging.Messages.SERVICE_STARTED, assembly.Name);
var host = CreateHostBuilder(args).Build();
using (var serviceScope = host.Services.CreateScope())
{
var context = serviceScope.ServiceProvider.GetRequiredService<MyDbContext>();
context.Database.Migrate(); // apply outstanding migrations automatically
}
host.Run();
return;
}
catch (Exception ex)
{
Log.Fatal(ex, Constants.Logging.Messages.SERVICE_STARTED, assembly.Name);
return;
}
finally
{
// make sure all batched messages are written.
Log.CloseAndFlush();
}
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.UseSerilog()
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});

并请求登录启动配置；

public void ConfigureServices(IServiceCollection services)
{
//...
services.AddApplicationInsightsTelemetry("aa11aa11aa-a1a1-a1-aa-a111-aa11");
//...
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
/// ...
// Add this line; you'll need `using Serilog;` up the top, too
app.UseSerilogRequestLogging();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapBlazorHub();
endpoints.MapFallbackToPage("/_Host");
});
}

在我的blazor页面上，我无法让它发挥作用；

@inject ILogger<ThisRazorPage> Logger
@code{
protected override void OnInitialized()
{
Logger.LogTrace("Log something. Please!");
}
}

但这确实有效；

@inject ILoggerFactory LoggerFactory
@code{
protected override void OnInitialized()
{
var logger = LoggerFactory.CreateLogger<Incident>();
logger.LogTrace("Log something. Please!");
}
}

根据此，.UseSerilog()方法添加用于ILoggerFactory的DI。有没有一种方法可以让我在DI框架中为ILogger<T>做一些类似的事情，这样就可以使用ILogger<T>，而不必在每个页面上显式地创建LoggerFactory。

Answer 1

您需要：

• 添加Serilog.Extensions.Logging
• 添加到您的Main((

public static async Task Main(string[] args)
{
var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");

// ...

builder.Services.AddTransient<AccountsViewModel>();

var levelSwitch = new LoggingLevelSwitch();
Log.Logger = new LoggerConfiguration()
.MinimumLevel.ControlledBy(levelSwitch)
.Enrich.WithProperty("InstanceId", Guid.NewGuid().ToString("n"))
.CreateLogger();
// ------------- this is what you'r looking for
builder.Logging.AddSerilog();
// ...
await builder.Build().RunAsync();
}

• 和ViewModel

public class AccountsViewModel
{
private readonly ILogger<AccountsViewModel> Logger;
private readonly HttpClient Http;
public AccountsViewModel(
ILogger<AccountsViewModel> logger,
HttpClient http
)
{
Http = http;
Logger = logger;
Logger.LogInformation("AccountsViewModel()");
}
}

• 或在您的剃须刀页面中：

@inject ILogger<ThisRazorPage> logger;

Answer 2

静态方法适用于我。

@using Serilog

@code {
Log.Information("Log something. Please!");
}