[.Net Core] - 使用 NLog 记录日志到 Sql Server

好的，以下是使用NLog将日志记录到SqlServer的步骤：

1. 首先，需要在项目中安装NLog和NLog.Web.AspNetCore包。可以使用NuGet包管理器或在项目文件中手动添加依赖项。

2. 在项目的appsettings.json文件中添加以下NLog配置：

"NLog": {
  "targets": {
    "database": {
      "type": "Database",
      "dbProvider": "System.Data.SqlClient",
      "connectionString": "Server=[server];Database=[database];User Id=[user];Password=[password];",
      "commandText": "INSERT INTO [Logs] ([Date], [Level], [Logger], [Message], [Exception]) VALUES (@Date, @Level, @Logger, @Message, @Exception);",
      "parameter": [
        {
          "name": "@Date",
          "layout": "${date}"
        },
        {
          "name": "@Level",
          "layout": "${level}"
        },
        {
          "name": "@Logger",
          "layout": "${logger}"
        },
        {
          "name": "@Message",
          "layout": "${message}"
        },
        {
          "name": "@Exception",
          "layout": "${exception}"
        }
      ]
    }
  },
  "rules": [
    {
      "logger": "*",
      "minLevel": "Trace",
      "writeTo": "database"
    }
  ]
}

3. 在Startup.cs文件中添加以下代码：

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory)
{
    //...
    loggerFactory.AddNLog();
    //...
    app.UseMiddleware<NLogMiddleware>();
    //...
}

4. 创建一个名为Logs的表，用于存储日志记录。表结构应如下所示：

CREATE TABLE [dbo].[Logs](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [Date] [datetime2](7) NOT NULL,
    [Level] [nvarchar](50) NOT NULL,
    [Logger] [nvarchar](250) NOT NULL,
    [Message] [nvarchar](max) NOT NULL,
    [Exception] [nvarchar](max) NULL,
 CONSTRAINT [PK_Logs] PRIMARY KEY CLUSTERED 
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

5. 现在，可以在代码中使用NLog记录日志了。例如：

private readonly ILogger<HomeController> _logger;

public HomeController(ILogger<HomeController> logger)
{
    _logger = logger;
}

public IActionResult Index()
{
    _logger.LogInformation("Hello, world!");
    return View();
}

这将在Logs表中插入一条日志记录。

希望这可以帮助到你。