使用DI和appsettings.json将Nlog日志记录到数据库是一个常见的需求,可以通过以下步骤实现:
{
"ConnectionStrings": {
"DefaultConnection": "YourConnectionString"
},
"NLog": {
"DbProvider": "YourDbProvider",
"ConnectionString": "${ConnectionStrings:DefaultConnection}",
"TableName": "YourLogTable"
}
}
其中,DefaultConnection
是数据库连接字符串的键名,YourConnectionString
是你的数据库连接字符串,DbProvider
是数据库提供程序(如System.Data.SqlClient
),TableName
是用于存储日志的表名。
Id
(日志记录的唯一标识)、TimeStamp
(日志记录的时间戳)、Level
(日志级别)、Message
(日志消息)等字段。using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
// 配置NLog
services.AddLogging(loggingBuilder =>
{
loggingBuilder.ClearProviders();
loggingBuilder.SetMinimumLevel(LogLevel.Trace);
loggingBuilder.AddNLog();
});
// 配置数据库连接
string connectionString = Configuration.GetConnectionString("DefaultConnection");
// 配置数据库日志记录器
services.AddSingleton<INLogDbLogger, NLogDbLogger>(provider =>
new NLogDbLogger(connectionString, provider.GetService<ILogger<NLogDbLogger>>()));
// 注册其他服务...
// 配置DI
services.AddControllers();
}
}
在上述代码中,首先使用AddLogging
方法配置NLog为日志提供程序,并指定最小日志级别为LogLevel.Trace
。然后,使用AddSingleton
方法注册一个自定义的INLogDbLogger
接口和NLogDbLogger
实现类,用于将日志记录到数据库中。
ILogger
接口的NLogDbLogger
类,用于实现将日志记录到数据库的逻辑。示例代码如下:using Microsoft.Extensions.Logging;
using NLog;
public interface INLogDbLogger
{
void Log(LogLevel level, string message);
}
public class NLogDbLogger : INLogDbLogger
{
private readonly ILogger<NLogDbLogger> _logger;
private readonly string _connectionString;
private readonly Logger _nlogLogger;
public NLogDbLogger(string connectionString, ILogger<NLogDbLogger> logger)
{
_logger = logger;
_connectionString = connectionString;
// 初始化NLog Logger
var configuration = new LoggingConfiguration();
var databaseTarget = new DatabaseTarget
{
ConnectionString = connectionString,
CommandText = "INSERT INTO YourLogTable (TimeStamp, Level, Message) VALUES (@timeStamp, @level, @message)",
CommandType = CommandType.Text,
Parameters =
{
new DatabaseParameterInfo("@timeStamp", "${date:format=yyyy-MM-dd HH\\:mm\\:ss}"),
new DatabaseParameterInfo("@level", "${level}"),
new DatabaseParameterInfo("@message", "${message}")
}
};
configuration.AddTarget("database", databaseTarget);
configuration.LoggingRules.Add(new LoggingRule("*", LogLevel.Trace, databaseTarget));
LogManager.Configuration = configuration;
_nlogLogger = LogManager.GetLogger("database");
}
public void Log(LogLevel level, string message)
{
_logger.Log(level, message);
switch (level)
{
case LogLevel.Trace:
_nlogLogger.Trace(message);
break;
case LogLevel.Debug:
_nlogLogger.Debug(message);
break;
case LogLevel.Information:
_nlogLogger.Info(message);
break;
case LogLevel.Warning:
_nlogLogger.Warn(message);
break;
case LogLevel.Error:
_nlogLogger.Error(message);
break;
case LogLevel.Critical:
_nlogLogger.Fatal(message);
break;
default:
_nlogLogger.Log(level.ToNLogLogLevel(), message);
break;
}
}
}
在上述代码中,NLogDbLogger
类实现了INLogDbLogger
接口,并在构造函数中初始化了NLog Logger,并将日志记录到数据库中。
INLogDbLogger
实例,并调用Log
方法记录日志。示例代码如下:using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
public class HomeController : ControllerBase
{
private readonly ILogger<HomeController> _logger;
private readonly INLogDbLogger _dbLogger;
public HomeController(ILogger<HomeController> logger, INLogDbLogger dbLogger)
{
_logger = logger;
_dbLogger = dbLogger;
}
public IActionResult Index()
{
_logger.LogInformation("This is a log message.");
_dbLogger.Log(LogLevel.Information, "This is a log message.");
return Ok();
}
}
在上述代码中,HomeController
通过DI获取了ILogger
和INLogDbLogger
实例,并在Index
方法中分别使用它们记录了日志。
这样,就通过DI和appsettings.json将NLog日志记录到数据库中。同时,可以根据需要修改NLog的配置,如日志级别、日志格式等。
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