如何传递参数到我的自定义过滤器

本文关键字：自定义 过滤器 我的 何传递 参数 | 更新日期: 2023-09-27 18:17:19

如何传递参数到我的自定义过滤器。我试了下面的方法，但我不知道如何传递参数。

public class AuditAttribute : ActionFilterAttribute
    {
        private PCBAuditEntities _entity = new PCBAuditEntities();
        public bool IsRequired { get; set; }
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            //Stores the Request in an Accessible object
            HttpRequestBase request = filterContext.HttpContext.Request;
            string actionname = filterContext.ActionDescriptor.ActionName;
            //Generate an audit
            Audit audit = new Audit()
                {
                    IpAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"] ?? request.UserHostAddress,
                    UrlAccessed = request.RawUrl,
                    TimeAccessed = DateTime.UtcNow,
                    UserName = (request.IsAuthenticated) ? filterContext.HttpContext.User.Identity.Name : "Anonymous",
                    Actionname = actionname,
                    EntityName ="" ,//what entity i changed?
                    FieldName = "",// How to find the FieldName?
                    Operations = "",// what operatins client did?
                    NewValue = "",// what is the new value?
                    Oldvalue = "",// what is the old value?
                };
            _entity.Audits.Add(audit);
            _entity.SaveChanges();
            base.OnActionExecuting(filterContext);
        }

    }
    [Audit(IsRequired = true)]
        public ActionResult About()
        {
            ViewBag.Message = "Your app description page.";
            return View();
        }

在上面的代码IsRequired中，我们只分配了true或false，所以我很容易发送参数，无论我是否需要发送EntityName, FieldName, NewValue, Oldvalue

如何从控制器发送值

如何传递参数到我的自定义过滤器

首先你可能想要重写OnActionExecuted事件。

要传递参数，必须创建带有参数的构造函数:

private paramType param;
public AuditAttribute(paramType param)
{
     this.param = param;
}
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