在C#中,要设置ILogger的输出格式,你需要使用Microsoft.Extensions.Logging库。以下是一个简单的示例,展示了如何配置ILogger以设置输出格式:
dotnet add package Microsoft.Extensions.Logging
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
},
"FormatterOptions": {
"FullTimestamp": true,
"IncludeScopes": true,
"IncludeExceptionDetails": true
}
}
}
在这个配置中,我们设置了日志级别和格式化选项。FullTimestamp
表示是否包含完整的时间戳,IncludeScopes
表示是否包含作用域信息,IncludeExceptionDetails
表示是否包含异常详细信息。
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
namespace MyApp
{
class Program
{
static void Main(string[] args)
{
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddControllersWithViews();
// Configure logging
builder.Services.Configure<LoggerFilterOptions>(options =>
{
options.Filter(level => level >= LogLevel.Information);
});
builder.Services.Configure<ConsoleLoggerOptions>(options =>
{
options.FullTimestamp = true;
options.IncludeScopes = true;
options.IncludeExceptionDetails = true;
});
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
app.UseExceptionHandler("/Home/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.MapControllerRoute(
name: "default",
pattern: "{controller=Home}/{action=Index}/{id?}");
}
}
}
在这个示例中,我们配置了ConsoleLoggerOptions
以使用与"appsettings.json"中相同的格式化选项。
现在,当你使用ILogger记录日志时,它们将使用指定的格式进行输出。例如:
public class HomeController : Controller
{
private readonly ILogger<HomeController> _logger;
public HomeController(ILogger<HomeController> logger)
{
_logger = logger;
}
public IActionResult Index()
{
_logger.LogInformation("This is an information message.");
_logger.LogWarning("This is a warning message.");
_logger.LogError("This is an error message.");
return View();
}
}
这将输出类似以下格式的日志:
2022-01-01 12:34:56 [Information] MyApp.HomeController[0] - This is an information message.
2022-01-01 12:34:56 [Warning] MyApp.HomeController[0] - This is a warning message.
2022-01-01 12:34:56 [Error] MyApp.HomeController[0] - This is an error message.