{"action":"created","comment":{"url":"https://api.github.com/repos/aspnet/Mvc/pulls/comments/24185080","id":24185080,"diff_hunk":"@@ -129,12 +132,6 @@ private static bool IsBindingAtRootOfObjectGraph(ModelBindingContext bindingCont\n                 PropertyFilter = oldBindingContext.PropertyFilter,\n             };\n \n-            // validation is expensive to create, so copy it over if we can","path":"src/Microsoft.AspNet.Mvc.ModelBinding/Binders/CompositeModelBinder.cs","position":112,"original_position":112,"commit_id":"e7af9c69b0aca6781f337737e1ab176fbca06a0d","original_commit_id":"e7af9c69b0aca6781f337737e1ab176fbca06a0d","user":{"login":"harshgMSFT","id":6729943,"avatar_url":"https://avatars.githubusercontent.com/u/6729943?v=3","gravatar_id":"","url":"https://api.github.com/users/harshgMSFT","html_url":"https://github.com/harshgMSFT","followers_url":"https://api.github.com/users/harshgMSFT/followers","following_url":"https://api.github.com/users/harshgMSFT/following{/other_user}","gists_url":"https://api.github.com/users/harshgMSFT/gists{/gist_id}","starred_url":"https://api.github.com/users/harshgMSFT/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/harshgMSFT/subscriptions","organizations_url":"https://api.github.com/users/harshgMSFT/orgs","repos_url":"https://api.github.com/users/harshgMSFT/repos","events_url":"https://api.github.com/users/harshgMSFT/events{/privacy}","received_events_url":"https://api.github.com/users/harshgMSFT/received_events","type":"User","site_admin":false},"body":"Nope, I don't think it was solving anything, perf is something we can take care of if we find it is a hotspot. What security concern do you think can happen here?","created_at":"2015-02-05T18:20:00Z","updated_at":"2015-02-05T18:20:00Z","html_url":"https://github.com/aspnet/Mvc/pull/1956#discussion_r24185080","pull_request_url":"https://api.github.com/repos/aspnet/Mvc/pulls/1956","_links":{"self":{"href":"https://api.github.com/repos/aspnet/Mvc/pulls/comments/24185080"},"html":{"href":"https://github.com/aspnet/Mvc/pull/1956#discussion_r24185080"},"pull_request":{"href":"https://api.github.com/repos/aspnet/Mvc/pulls/1956"}}},"pull_request":{"url":"https://api.github.com/repos/aspnet/Mvc/pulls/1956","id":28669437,"html_url":"https://github.com/aspnet/Mvc/pull/1956","diff_url":"https://github.com/aspnet/Mvc/pull/1956.diff","patch_url":"https://github.com/aspnet/Mvc/pull/1956.patch","issue_url":"https://api.github.com/repos/aspnet/Mvc/issues/1956","number":1956,"state":"open","locked":false,"title":"[Design]Removing model validation node and merging Body and non body model validator.","user":{"login":"harshgMSFT","id":6729943,"avatar_url":"https://avatars.githubusercontent.com/u/6729943?v=3","gravatar_id":"","url":"https://api.github.com/users/harshgMSFT","html_url":"https://github.com/harshgMSFT","followers_url":"https://api.github.com/users/harshgMSFT/followers","following_url":"https://api.github.com/users/harshgMSFT/following{/other_user}","gists_url":"https://api.github.com/users/harshgMSFT/gists{/gist_id}","starred_url":"https://api.github.com/users/harshgMSFT/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/harshgMSFT/subscriptions","organizations_url":"https://api.github.com/users/harshgMSFT/orgs","repos_url":"https://api.github.com/users/harshgMSFT/repos","events_url":"https://api.github.com/users/harshgMSFT/events{/privacy}","received_events_url":"https://api.github.com/users/harshgMSFT/received_events","type":"User","site_admin":false},"body":"This is a refactor of how we do model validation. \r\nThe idea is to do a top down approach once the model object is available,\r\ninstead of building a tree during validaiton and then validating. This is possible because the state is already externallized in ModelState.\r\nThis is an improvement to the existing system where model binders were responsible for validating the models, and add corresponding errors. The model validation system is now independent of the model binding system. \r\nThis helps us in unifying the code base for body and non body based binders.\r\nCurrently all model binders except mutable object binder are independent of validation code. The mutable object binder which needs to do some validation ( for scenarios involving ```[BindRequired]``` and ```[BindNever]```). This should be cleaned up in a followup PR.\r\n\r\nfollowup PRs:\r\n   1. Cleanup MutableObjectBinder.\r\n   2. Introduce support for skipping validation (and not binding) for a particular property/type etc.\r\n\r\ncc : @yishaigalatzer , @pranavkm @rynowak 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