ActionFilterAttribute

2022-05-04 09:33:54 阅读：143 来源： 互联网

标签：JsonResult Result context var ActionFilterAttribute HttpContext public

1、新建类CustomActionResultFilterAttribute，继承ActionFilterAttribute

 1 using Microsoft.AspNetCore.Mvc;
 2 using Microsoft.AspNetCore.Mvc.Filters;
 3 using Project6.Model;
 4 
 5 namespace Project6.Utility.Filters
 6 {
 7     public class CustomActionResultFilterAttribute:ActionFilterAttribute
 8     {
 9         private readonly ILogger<CustomActionResultFilterAttribute> _ILogger;
10 
11         public CustomActionResultFilterAttribute(ILogger<CustomActionResultFilterAttribute> iLogger)
12         {
13             this._ILogger = iLogger;
14         }
15 
16         public override void OnActionExecuting(ActionExecutingContext context)
17         {
18             var para = context.HttpContext.Request.QueryString.Value;
19             var controllerName = context.HttpContext.GetRouteValue("controller");
20             var actionName = context.HttpContext.GetRouteValue("action");
21             _ILogger.LogInformation($"执行{controllerName} - {actionName},参数为：{para}");
22         }
23 
24         public override void OnActionExecuted(ActionExecutedContext context)
25         {
26             var result = Newtonsoft.Json.JsonConvert.SerializeObject(context.Result);
27             var controllerName = context.HttpContext.GetRouteValue("controller");
28             var actionName = context.HttpContext.GetRouteValue("action");
29             _ILogger.LogInformation($"执行{controllerName} - {actionName},结果为：{result}");
30         }
31 
32         public  override async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
33         {
34             var controllerName = context.HttpContext.GetRouteValue("controller");
35             var actionName = context.HttpContext.GetRouteValue("action");
36             var para = context.HttpContext.Request.QueryString.Value;
37             _ILogger.LogInformation($"执行{controllerName} - {actionName}方法:参数为:{para}");
38 
39             //去执行控器里面的Action
40             ActionExecutedContext executedContext = await next.Invoke();
41 
42             var result = Newtonsoft.Json.JsonConvert.SerializeObject(executedContext.Result);
43             _ILogger.LogInformation($"执行{controllerName} - {actionName}方法:结果为:{result}");
44         }
45 
46         public override void OnResultExecuting(ResultExecutingContext context)
47         {
48             if (context.Result is JsonResult)
49             {
50                 JsonResult jsonResult = (JsonResult)context.Result;
51                 context.Result = new JsonResult(new AjaxResult()
52                 {
53                     Success = true,
54                     Message = "OK",
55                     Data = jsonResult.Value
56                 });
57             }
58         }
59 
60         public override void OnResultExecuted(ResultExecutedContext context)
61         {
62             base.OnResultExecuted(context);
63         }
64 
65         public override async Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
66         {
67             if (context.Result is JsonResult)
68             {
69                 JsonResult jsonResult = (JsonResult)context.Result;
70                 context.Result = new JsonResult(new AjaxResult()
71                 {
72                     Success = true,
73                     Message = "OK",
74                     Data = jsonResult.Value
75                 });
76             }
77 
78             await next.Invoke();
79         }
80     }
81 }

View Code

2、新建类AjaxResult

 1 namespace Project6.Model
 2 {
 3     public class AjaxResult
 4     {
 5         public bool Success { get; set; }
 6         public string Message { get; set; }
 7         public object Data { get; set; }
 8 
 9     }
10 }

View Code

3、新建控制器CustomActionResultFilterController

 1 using Microsoft.AspNetCore.Mvc;
 2 using Project6.Utility.Filters;
 3 
 4 namespace Project6.Controllers
 5 {
 6     public class CustomActionResultFilterController : Controller
 7     {
 8         [TypeFilter(typeof(CustomActionResultFilterAttribute))]
 9         public IActionResult Index(int id)
10         {
11             int _id = id;
12             return Json(new
13             {
14                 Id = _id,
15                 Name = "net"
16             });
17         }
18     }
19 }

View Code

4、在各个方法开始处设置断点，执行/CustomActionResultFilter?id=1

可以发现程序执行顺序为：OnActionExecutionAsync--->

执行到 ActionExecutedContext executedContext = await next.Invoke();时跳到控制器CustomActionResultFilterController的Index-->

执行为Action方法之后，继续执行 ActionExecutedContext executedContext = await next.Invoke();之后的代码-->

OnResultExecutionAsync

结论：1、ActionFilterAttribute抽像类继承 Attribute, IActionFilter, IFilterMetadata, IAsyncActionFilter, IResultFilter, IAsyncResultFilter, IOrderedFilter

只要继承它即可以实现常见的过滤方法。

2、当同步方法和异步方法同时存在，程序只处理异步方法

标签：JsonResult,Result,context,var,ActionFilterAttribute,HttpContext,public
来源： https://www.cnblogs.com/handsomeziff/p/16220366.html

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。

ICode9

ActionFilterAttribute