Later, because of the need to read the user cookie value as a global variable for master page, such as the head address, but found in a constructor, is not generated, no matter have cookie content, are said to be null, but also not allowed, errors, for some reason, please people
The code is as follows:

 public class BaseController: Controller 
{




//GET: Base [the Authorize] 


Public BaseController () 
{


String ImageUrl=Common. The ImageUrl; 
String cookiename=Request. Cookies [". Cookiename "]; 
If (cookiename!=null & amp; & Cookiename. Length & gt; 0) 
{
String AdminFace=User. FindFirst (" FacePhoto "). The Value; 
. String AdminTrueName=User Identity. The Name; 
ViewBag. AdminFace=ImageUrl + AdminFace; 
ViewBag. AdminTrueName=AdminTrueName; 
} 






} 

Run error:
System. NullReferenceException: "Object reference not set to an instance of an Object."

But it can put into a specific page, normal read

 
Public IActionResult Index () 
{


String ImageUrl=Common. The ImageUrl; 
String cookiename=Request. Cookies [". AspNetCore. JPTABCOOKIE "]. 
If (cookiename!=null & amp; & Cookiename. Length & gt; 0) 
{
String AdminFace=User. FindFirst (" FacePhoto "). The Value; 
. String AdminTrueName=User Identity. The Name; 
ViewBag. AdminFace=ImageUrl + AdminFace; 
ViewBag. AdminTrueName=AdminTrueName; 
} 

return View(); 
} 

CodePudding user response:

In

 protected override void OnActionExecuting (ActionExecutingContext filterContext) 

CodePudding user response:

The constructor as far as possible don't do operation, only do variable initialization, you can try to create a new static class, create a static method in the class, need to use to call again,

CodePudding user response:

A cookie is generally in page read