{"id":58939,"date":"2022-07-05T02:39:16","date_gmt":"2022-07-05T02:39:16","guid":{"rendered":"https:\/\/www.techwebspace.com\/?p=58939"},"modified":"2022-07-05T02:39:17","modified_gmt":"2022-07-05T02:39:17","slug":"explain-filter-overrides-in-asp-net-mvc-2022","status":"publish","type":"post","link":"https:\/\/www.techwebspace.com\/explain-filter-overrides-in-asp-net-mvc-2022\/","title":{"rendered":"Explain Filter Overrides in Asp.Net MVC 2022"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">What are Filter overrides in MVC?<\/h2>\n\n\n\n<p>&#8220;Filter overrides&#8221; is one of the critical features of ASP.NET MVC used while <a href=\"https:\/\/www.ifourtechnolab.com\/dot-net-development-company\">.NET development<\/a>. Its main purpose is to exclude action, method, or controller from the controller level filter or global filter. It allows us to clear specific types of filters that might be created at the higher scopes.<\/p>\n\n\n\n<p>Let\u2019s say, there is a scenario where we created a global action filter or a controller-level action filter, now we have an action method on which we don\u2019t want to use an action filter in Asp.Net MVC. In this scenario, the filter override feature is used.<\/p>\n\n\n\n<p>In MVC, there are five types of filters available.<\/p>\n\n\n\n<ol type=\"1\"><li>Action filters<\/li><li>Authentication filters<\/li><li>Authorization filters<\/li><li>Exception filters<\/li><li>Result filters<\/li><\/ol>\n\n\n\n<p>Therefore, we have five filter overrides according to prior filters:<\/p>\n\n\n\n<ol type=\"1\"><li>OverrideActionFiltersAttribute<\/li><li>OverrideAuthenticationAttribute<\/li><li>OverrideAuthorizationAttribute<\/li><li>OverrideExceptionAttribute<\/li><li>OverrideResultAttribute<\/li><\/ol>\n\n\n\n<p>We can mark any action method with a corresponding override filter attribute that essentially clears all the filters at the controller level or global level.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How to apply the Authorization Filter at the controller level?<\/strong><\/h2>\n\n\n\n<p>In this following example, we will discuss in detail the Filter Override. Here, the Authorization Filter is applied at the controller level. Thus, all the action methods of the home controller can be accessed by the Admin user only. Now, we will bypass or exclude the Authorize Filter from the \u201cAbout\u201d method.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><code>&#91;Authorize(Users=\"Admin\")]  \npublic class HomeController : Controller  \n{  \n    public ActionResult Index()  \n    {  \n        ViewBag.Message = \"iFour Technolab\";  \n        return View();  \n    }   \n    public ActionResult About()  \n    {  \n        return View();  \n    }  \n}<span style=\"background-color: inherit;font-family: inherit;font-size: inherit;color: initial\">\n<\/span><\/code><\/code><\/pre>\n\n\n\n<p>Here, we will mark the \u201cAbout\u201d method with the \u201cOverrideAuthorization\u201d attribute. Now, all the action methods of the home controller are available to access for Admin users except the \u201cAbout\u201d action method without any type of authorization.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;Authorize(Users=\"Admin\")]  \npublic class HomeController : Controller  \n{  \n    public ActionResult Index()  \n    {  \n        ViewBag.Message = \"Welcome to ASP.NET MVC!\";  \n        return View();  \n    }  \n    &#91;OverrideAuthorization]  \n    public ActionResult About()  \n    {  \n        return View();  \n    }  \n}  \n<\/code><\/pre>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n\n<p>Open the Visual Studio and click Create New Project.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-2.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-2.png\" alt=\"\" class=\"wp-image-58943\" width=\"665\" height=\"498\" srcset=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-2.png 975w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-2-300x225.png 300w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-2-768x576.png 768w\" sizes=\"(max-width: 665px) 100vw, 665px\" \/><\/a><figcaption>Figure 1: Visual Studio Home<\/figcaption><\/figure><\/div>\n\n\n<p>After selecting New Project, we will select Web Templates from the left side of the panel after the selection of Web Template, we will see only one project template in that portion which is \u201cASP.NET Web Application\u201d, select that.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-3.png\"><img decoding=\"async\" loading=\"lazy\" width=\"975\" height=\"731\" src=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-3.png\" alt=\"\" class=\"wp-image-58944\" srcset=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-3.png 975w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-3-300x225.png 300w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-3-768x576.png 768w\" sizes=\"(max-width: 975px) 100vw, 975px\" \/><\/a><figcaption>Figure 2: Visual Studio Project Creation<\/figcaption><\/figure><\/div>\n\n\n<p>After that, we will name the project \u201cMVC5DEMO5\u201d and click the OK button. A new popup will be shown in the same tab.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-4.png\"><img decoding=\"async\" loading=\"lazy\" width=\"975\" height=\"756\" src=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-4.png\" alt=\"\" class=\"wp-image-58945\" srcset=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-4.png 975w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-4-300x233.png 300w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-4-768x595.png 768w\" sizes=\"(max-width: 975px) 100vw, 975px\" \/><\/a><figcaption>Figure 3: Visual Studio Project Selection<\/figcaption><\/figure><\/div>\n\n\n<p>Here, we will choose the MVC Project template and then choose the Authentication type as Choose Individual User Accounts.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-5.png\"><img decoding=\"async\" loading=\"lazy\" width=\"975\" height=\"362\" src=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-5.png\" alt=\"\" class=\"wp-image-58946\" srcset=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-5.png 975w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-5-300x111.png 300w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-5-768x285.png 768w\" sizes=\"(max-width: 975px) 100vw, 975px\" \/><\/a><figcaption>Figure 4: Selection of Authentication<\/figcaption><\/figure><\/div>\n\n\n<p>When we choose this option for Authentication of application, it will be configured to use ASP.NET Identity where the User can register in the Application and sign in using the credentials. New features of MVC 5 also support Sign in via Facebook, Google, Microsoft, and Twitter. All the data are collected and stored in the SQL Server database.<\/p>\n\n\n\n<p>When you select the Authentication type as Individual User Accounts, and click on OK, you will see a progress bar while project creation.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-6.png\"><img decoding=\"async\" loading=\"lazy\" width=\"629\" height=\"188\" src=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-6.png\" alt=\"\" class=\"wp-image-58947\" srcset=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-6.png 629w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-6-300x90.png 300w\" sizes=\"(max-width: 629px) 100vw, 629px\" \/><\/a><figcaption>Figure 5: Project Created Successfully<\/figcaption><\/figure><\/div>\n\n\n<p>After successfully creating the project, you will be shown Readme HTML page with links on the page.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-7.png\"><img decoding=\"async\" loading=\"lazy\" width=\"975\" height=\"731\" src=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-7.png\" alt=\"\" class=\"wp-image-58948\" srcset=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-7.png 975w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-7-300x225.png 300w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-7-768x576.png 768w\" sizes=\"(max-width: 975px) 100vw, 975px\" \/><\/a><figcaption>Figure 6: Home Page<\/figcaption><\/figure><\/div>\n\n\n<p>Now, we will add the Filter folder to the Project. For that, right-click on MVC5DEMO5 and select Add, and inside that select New Folder.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-8.png\"><img decoding=\"async\" loading=\"lazy\" width=\"495\" height=\"761\" src=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-8.png\" alt=\"\" class=\"wp-image-58949\" srcset=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-8.png 495w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-8-195x300.png 195w\" sizes=\"(max-width: 495px) 100vw, 495px\" \/><\/a><figcaption>Figure 7: Visual Studio Project Folders<\/figcaption><\/figure><\/div>\n\n\n<p>After successfully creating the folder, we will add Filters in this folder to validate whether the user has logged in to the application or not.<\/p>\n\n\n\n<p>Now, we are going to add Filter in the Filters folder with the name UserAuthenticationFilter and it will inherit a class FilterAttribute and IAuthenticationFilter, and in this filter, we are just going to check Session is IsNullOrEmpty; If it is NULL or Empty, then we are going to redirect it to Error View, if not then it will allow executing Action Method.<\/p>\n\n\n\n<p>Here is the code snipped for UserAuthenticationFilter:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><code>using System;\nusing System.Web.Mvc;\nusing System.Web.Mvc.Filters;\n\nnamespace MVC5DEMO5.Filters\n{\n    public class UserAuthenticationFilter : FilterAttribute, IAuthenticationFilter \n    {\n        public void OnAuthentication(AuthenticationContext filterContext)\n        {\n            if (string.IsNullOrEmpty(Convert.ToString(filterContext.HttpContext.Session&#91;\"UserID\"])))\n            {\n                filterContext.Result = new ViewResult\n                {\n                    ViewName = \"Error\"\n                };\n\n            }\n        }\n\n        public void OnAuthenticationChallenge(AuthenticationChallengeContext filterContext)\n        {\n           \n        }\n    }\n}\n<\/code><\/code><\/pre>\n\n\n\n<p>Next, we will apply the UserAuthenticationFilter Filter on HomeController. This controller is created by default when we have created a project.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-9.png\"><img decoding=\"async\" loading=\"lazy\" width=\"488\" height=\"786\" src=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-9.png\" alt=\"\" class=\"wp-image-58950\" srcset=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-9.png 488w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-9-186x300.png 186w\" sizes=\"(max-width: 488px) 100vw, 488px\" \/><\/a><figcaption>Figure 8: Adding the Controller<\/figcaption><\/figure><\/div>\n\n\n<p>To access controller for a user, he must have Session[\u201cUserID\u201d]. It wll get him to error view if the ID is found Null or empty.<\/p>\n\n\n\n<div class=\"wp-block-group is-layout-flow\"><div class=\"wp-block-group__inner-container\">\n<pre class=\"wp-block-code\"><code><code>using MVC5DEMO5.Filters;\nusing System.Web.Mvc;\n\nnamespace MVC5DEMO5.Controllers\n{\n\t&#91;UserAuthenticationFilter]\n\tpublic class HomeController : Controller\n\t{\n\t\tpublic ActionResult Index()\n\t\t{\n\t\t\treturn View();\n\t\t}\n\t\tpublic ActionResult About()\n\t\t{\n\t\t\tViewBag.Message = \"Your application description page.\";\n\t\t\treturn View();\n\t\t}\n\t\tpublic ActionResult Contract()\n\t\t{\n\t\t\tViewBag.Message = \"Your Contact page.\";\n\t\t\treturn View();\n\t\t}\n\t}\n}\n<\/code><\/code><\/pre>\n<\/div><\/div>\n\n\n\n<p>After saving the changes, let&#8217;s run the application using the following URL:<\/p>\n\n\n\n<p><a href=\"http:\/\/localhost:xxxxx\/home\/Index\">http:\/\/localhost:xxxxx\/home\/Index<\/a><\/p>\n\n\n\n<p>The following Error View screen will appear whenever we will try to open any pages among Index, About and Contact.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-10.png\"><img decoding=\"async\" loading=\"lazy\" width=\"975\" height=\"382\" src=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-10.png\" alt=\"\" class=\"wp-image-58951\" srcset=\"https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-10.png 975w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-10-300x118.png 300w, https:\/\/www.techwebspace.com\/wp-content\/uploads\/2022\/07\/image-10-768x301.png 768w\" sizes=\"(max-width: 975px) 100vw, 975px\" \/><\/a><figcaption>Figure 9: Error View<\/figcaption><\/figure><\/div>\n\n\n<p>Now, we will apply the [OverrideAuthentication] filter on the About Action Method as below:<\/p>\n\n\n\n<div class=\"wp-block-group is-layout-flow\"><div class=\"wp-block-group__inner-container\">\n<div class=\"wp-block-group is-layout-flow\"><div class=\"wp-block-group__inner-container\">\n<pre class=\"wp-block-code\"><code><code>using MVC5DEMO5.Filters;\nusing System.Web.Mvc;\n\nnamespace MVC5DEMO5.Controllers\n{\n    &#91;UserAuthenticationFilter]\n    public class HomeController : Controlller\n    {\n        public ActionResult Index()\n        {\n            return View();\n        }\n        &#91;OverrideAuthentication]\n        public ActionResult About()\n        {\n            ViewBag.Message = \"Your application description page.\"\n            return View();\n        }\n        public ActionResult Contact()\n        {\n                        ViewBag.Message = \"Your contact page.\"\n            return View();\n        }\n    }\n}  \n<\/code><\/code><\/pre>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<p>There will be three possible outcomes:<\/p>\n\n\n\n<ol type=\"1\"><li>If we access the Index Action Method, it will redirect to Error view as UserAuthenticationFilter is applied on Controller. It means that it is applied to all the Action Methods inside that Controller.<\/li><li>If we access the Contact Action Method, it too will redirect to Error view as UserAuthenticationFilter is applied on Controller. It means that it is applied to all the Action Methods inside that Controller.<\/li><li>If we access the About Action method, it will not redirect to Error view as we have applied the OveerideAction Filter on this action method.<\/li><\/ol>\n\n\n\n<p>If we want to override the Action filter then we must only apply the OverrideActionFilters but if we apply any other filter such as OverrideAuthentication or OverrideAuthorization or OverrideResultFilter or OverrideExceptionFilters, it won&#8217;t work.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h3>\n\n\n\n<p>In this article, we learned what is override in MVC, the types of overrides, and an example of overrides used in an MVC application. This will provide you with an easy and complete understanding of the Filter override procedures. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>What are Filter overrides in MVC? &#8220;Filter overrides&#8221; is one of the critical features of ASP.NET MVC used while .NET development. Its main purpose is to exclude action, method, or controller from the controller level filter or global filter. It allows us&#8230;<\/p>\n","protected":false},"author":9382,"featured_media":56515,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1399,5986,6140,2357,450,1791,519],"tags":[7791,7790,7789,7793,7792],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Explain Filter Overrides in ASP.NET MVC 2022<\/title>\n<meta name=\"description\" content=\"In this article, we learned what is an override in MVC, the types of overrides, and an example of overrides used in an MVC application. complete understanding of the Filter override.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.techwebspace.com\/explain-filter-overrides-in-asp-net-mvc-2022\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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