Question

正如标题所示。如何使用ASP.NET Core 2.x在同一操作筛选器中访问IConfiguration，Cookie和DBContext？

我可以找到许多建议如何做另一种方法的文章，但是我什至找不到任何事情可以做两个，更不用说全部三个了。

当我尝试合并文章时，通常会遇到一个或多个运行时错误。

有没有办法做到这一点。我有一个非常有用的库，我正在尝试从ASP.Net移植过来，我真的不想全部重写。

任何帮助或工作示例将不胜感激。谢谢

Answer 1

要从ActionFilter构造函数访问服务，请尝试以下代码：

public class RequestLoggerActionFilter : ActionFilterAttribute
{
    private readonly ILogger _logger;
    private readonly IConfiguration _configuration;
    private readonly MVCProContext _context;
    private readonly IHttpContextAccessor _httpContextAccessor;
    public RequestLoggerActionFilter(ILoggerFactory loggerFactory
        , IConfiguration configuration
        , MVCProContext context
        , IHttpContextAccessor httpContextAccessor)
    {
        _logger = loggerFactory.CreateLogger("RequestLogger");
        _configuration = configuration;
        _context = context;
        _httpContextAccessor = httpContextAccessor;
        var cookies = _httpContextAccessor.HttpContext.Request.Cookies;
    }

    public override void OnActionExecuting(ActionExecutingContext context)
    {           
        base.OnActionExecuting(context);
    }
}

如果要在OnActionExecuting中访问而无需构造函数注入。

public override void OnActionExecuting(ActionExecutingContext context)
{
    var configuration = context.HttpContext.RequestServices.GetRequiredService<IConfiguration>();
    var cookies = context.HttpContext.Request.Cookies;
    var db = context.HttpContext.RequestServices.GetRequiredService<MVCProContext>();
    base.OnActionExecuting(context);
}

用于在控制器操作中使用ActionFilter。

[TypeFilter(typeof(RequestLoggerActionFilter))]
public ActionResult RequestLogger()
{
    return Ok("RequestLoggerActionFilter");
}

Answer 2

要从 ActionFilter 访问配置，请尝试以下代码：

    private IConfiguration configuration;

    public override void OnResultExecuting(ResultExecutingContext context)
    {
        configuration = context.HttpContext.RequestServices.GetService<IConfiguration>();
        var connString = configuration["ConnectionStrings"];
    }

如何在ASP.Net Core 2.x的操作筛选器中获取配置，Cookie和DBContext

2 个答案: