{"action":"created","comment":{"url":"https://api.github.com/repos/aspnet/Mvc/pulls/comments/37246474","id":37246474,"diff_hunk":"@@ -40,18 +40,22 @@ public class MutableObjectModelBinder : IModelBinder\n                 return null;\n             }\n \n-            EnsureModel(bindingContext);\n-            var result = await CreateAndPopulateDto(bindingContext, mutableObjectBinderContext.PropertyMetadata);\n+            // Create model first (if necessary) to avoid reporting errors about properties when activation fails.\n+            var model = GetModel(bindingContext);\n+\n+            var results = await BindPropertiesAsync(bindingContext, mutableObjectBinderContext.PropertyMetadata);\n \n             var validationNode = new ModelValidationNode(\n                 bindingContext.ModelName,\n                 bindingContext.ModelMetadata,\n-                bindingContext.Model);\n+                model);\n+\n+            // Post-processing e.g. property setters and hooking up validation.\n+            bindingContext.Model = model;","path":"src/Microsoft.AspNet.Mvc.Core/ModelBinding/MutableObjectModelBinder.cs","position":18,"original_position":18,"commit_id":"2b5a260bbfb588a90b15d98c176fce15bf9244d9","original_commit_id":"2b5a260bbfb588a90b15d98c176fce15bf9244d9","user":{"login":"dougbu","id":6431421,"avatar_url":"https://avatars.githubusercontent.com/u/6431421?v=3","gravatar_id":"","url":"https://api.github.com/users/dougbu","html_url":"https://github.com/dougbu","followers_url":"https://api.github.com/users/dougbu/followers","following_url":"https://api.github.com/users/dougbu/following{/other_user}","gists_url":"https://api.github.com/users/dougbu/gists{/gist_id}","starred_url":"https://api.github.com/users/dougbu/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dougbu/subscriptions","organizations_url":"https://api.github.com/users/dougbu/orgs","repos_url":"https://api.github.com/users/dougbu/repos","events_url":"https://api.github.com/users/dougbu/events{/privacy}","received_events_url":"https://api.github.com/users/dougbu/received_events","type":"User","site_admin":false},"body":"If we did that `BindPropertiesAsync()` would behave differently for no good reason.","created_at":"2015-08-17T22:49:20Z","updated_at":"2015-08-17T22:49:20Z","html_url":"https://github.com/aspnet/Mvc/pull/2984#discussion_r37246474","pull_request_url":"https://api.github.com/repos/aspnet/Mvc/pulls/2984","_links":{"self":{"href":"https://api.github.com/repos/aspnet/Mvc/pulls/comments/37246474"},"html":{"href":"https://github.com/aspnet/Mvc/pull/2984#discussion_r37246474"},"pull_request":{"href":"https://api.github.com/repos/aspnet/Mvc/pulls/2984"}}},"pull_request":{"url":"https://api.github.com/repos/aspnet/Mvc/pulls/2984","id":42615252,"html_url":"https://github.com/aspnet/Mvc/pull/2984","diff_url":"https://github.com/aspnet/Mvc/pull/2984.diff","patch_url":"https://github.com/aspnet/Mvc/pull/2984.patch","issue_url":"https://api.github.com/repos/aspnet/Mvc/issues/2984","number":2984,"state":"open","locked":false,"title":"Change `MutableObjectModelBinder` to pass complex property values into binding system","user":{"login":"dougbu","id":6431421,"avatar_url":"https://avatars.githubusercontent.com/u/6431421?v=3","gravatar_id":"","url":"https://api.github.com/users/dougbu","html_url":"https://github.com/dougbu","followers_url":"https://api.github.com/users/dougbu/followers","following_url":"https://api.github.com/users/dougbu/following{/other_user}","gists_url":"https://api.github.com/users/dougbu/gists{/gist_id}","starred_url":"https://api.github.com/users/dougbu/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dougbu/subscriptions","organizations_url":"https://api.github.com/users/dougbu/orgs","repos_url":"https://api.github.com/users/dougbu/repos","events_url":"https://api.github.com/users/dougbu/events{/privacy}","received_events_url":"https://api.github.com/users/dougbu/received_events","type":"User","site_admin":false},"body":"- #2836\r\n\r\nSee individual commits for details. Brief overview:\r\n- first commit lays the groundwork, removing `ComplexModelDTO`\r\n- third commit contains the real fix\r\n- second and fourth commits are somewhat optional; they just clean up test 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