使用 ActionFilter 进行 ASP.NET Core 日志记录

Question

我正在尝试添加日志记录功能以保存到我的 SQL Server 数据库。我尝试创建 ActionFilter 类并应用于我的控制器之一，但不起作用。 我想捕获用户 ID、IP 地址、控制器和操作访问以及时间戳。我错过了什么？

AuditAttribute Action Filter class

public class AuditAttribute : ActionFilterAttribute
{
    private readonly ApplicationDbContext _db;

    //Inject ApplicationDBContext
    public AuditAttribute(ApplicationDbContext db)
    {
        _db = db;
    }

    IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {

         //Stores the Request in an Accessible object
         var request = filterContext.HttpContext.Request;

        //Generate an audit
        Portal_Logger audit = new Portal_Logger()
        {
            teacherNRIC = filterContext.HttpContext.User.Identity.Name,
            IPAddress = Convert.ToString(ipHostInfo.AddressList.FirstOrDefault(address => address.AddressFamily == AddressFamily.InterNetwork)),
            ControllerAccess = (string)filterContext.RouteData.Values["controller"],
            Timestamp = DateTime.Now,
        };

         public DbSet<Portal_Logger> Portal_LoggerDBSet { get; set; }
        //Store objects to database
        _db.Portal_LoggerDBSet.Add(audit);
        _db.SaveChanges();

        base.OnActionExecuting(filterContext);
    }

}
}     


Home controller class
[AuditAttribute]
public class HomeController : Controller
{ ..content of controller
}


Portal_logger model class
public class Portal_Logger
{
    [Key]
    public int LoggerId { get; set; }

    [StringLength(10)]
    public string userid{ get; set; }

    [StringLength(50)]
    public string IPAddress { get; set; }

    [StringLength(50)]
    public string ControllerAccess { get; set; }

    public DateTime? Timestamp { get; set; }

}

请参阅附图所示的错误消息 错误信息截图

我尝试过，但遇到了新问题。 在此输入图片描述

这个方法我也试过了，还是不行。 [AuditActionFilter] -> 错误消息（AuditActionFilter 不是属性类）

public class HomeController : Controller
{
}

---

我尝试过这个方法，但还是不行。

[AuditActionFilter] - error message -> "AuditActionFilter" is not an 
public class HomeController : Controller
{
}

我已经添加了services.AddMVC到startup.cs

services.AddMvc(options => options.Filters.Add(typeof(AuditActionFilter)));

这是 AuditActionFilter.cs

public class AuditActionFilter : IActionFilter
{
    private readonly ApplicationDbContext _db;

    public AuditActionFilter(ApplicationDbContext db)
    {
        _db = db;
    }

    IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
    public void OnActionExecuting(ActionExecutingContext filterContext)
    {

        var request = filterContext.HttpContext.Request;

        Portal_Logger audit = new Portal_Logger()
        {
            teacherNRIC = filterContext.HttpContext.User.Identity.Name,
            IPAddress = Convert.ToString(ipHostInfo.AddressList.FirstOrDefault(address => address.AddressFamily == AddressFamily.InterNetwork)),
            ControllerAccess = (string)filterContext.RouteData.Values["controller"],
            Timestamp = DateTime.Now,
        };

        //Store objects to database
        _db.Portal_LoggerDBSet.Add(audit);
        _db.SaveChanges();
    }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        // do something after the action executes or leave it empty
    }

}

Answer 1

要在特定方法或控制器上使用

AuditAttribute

，您可以尝试

ServiceFilterAttribute

或

TypeFilterAttribute

。

以下是可用的两个选项：

选项1

使用

TypeFilterAttribute

。

[TypeFilter(typeof(AuditAttribute))]
public class HomeController : Controller

选项2

使用

ServiceFilterAttribute

1. 在

   AuditAttribute

    注册 

   Startup.cs

    services.AddScoped<AuditAttribute>();
   

2. 使用

   AuditAttribute

    [ServiceFilter(typeof(AuditAttribute))]
    public class HomeController : Controller
   

Answer 2

发生错误是因为您的属性上有一个“DbContext”参数，但在将其应用到控制器时没有提供它？

public AuditAttribute(ApplicationDbContext db)
{
    _db = db;
}

Answer 3

如何在 Action 过滤器中使用 DI 描述如下： https://www.c-sharpcorner.com/blogs/custom-filter-in-mvc-or-logging-using-mvc-filter

文章简短：

为所有控制器启用：

starup.cs：

services.AddMvc(options =>  
{  
   options.Filters.Add(typeof(AuditAttribute));  
});

仅对一个控制器启用：

starup.cs：

services.AddScoped<AuditAttribute>();

接下来放置在控制器或操作方法上：

[ServiceFilter(typeof(AuditAttribute))] 

Answer 4

要使用该属性而不必求助于 [TypeFilter(typeof(AuditAttribute))] 或 [ServiceFilter(typeof(AuditAttribute))] ，应该可以通过使用 filterContext.HttpContext.RequestServices.GetService 而不是通过构造函数。

public class AuditActionFilter : IActionFilter
{

public AuditActionFilter(){}

IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());

public void OnActionExecuting(ActionExecutingContext filterContext)
{
    ApplicationDbContext _db = filterContext.HttpContext.RequestServices.GetService<ApplicationDbContext>();

    var request = filterContext.HttpContext.Request;

    Portal_Logger audit = new Portal_Logger()
    {
        teacherNRIC = filterContext.HttpContext.User.Identity.Name,
        IPAddress = Convert.ToString(ipHostInfo.AddressList.FirstOrDefault(address => address.AddressFamily == AddressFamily.InterNetwork)),
        ControllerAccess = (string)filterContext.RouteData.Values["controller"],
        Timestamp = DateTime.Now,
    };

    //Store objects to database
    _db.Portal_LoggerDBSet.Add(audit);
    _db.SaveChanges();
}