AspNetCore Model property values null on POST only when action parameter is called “model”

[devfunkd]

Is this a Bug or Feature request?:

Bug

Steps to reproduce (preferably a link to a GitHub repo with a repro project):

• Using built-in scaffolding, create a new CRUD controller binding to model.
• Change parameter name on POST action to "model"
• Attempt to post data back to the controller

Description of the problem:

Did something change in AspNetCore that no longer allows you to use the parameter name "model" on POST actions?

If I do this, the DeviceModel property values are populated on postback:

[HttpPost] 
public IActionResult Create(DeviceModel **device**)

However if I change the parameter name from "device" to "model" the property values are null.

[HttpPost]
public IActionResult Create(DeviceModel **model**)
Is this a bug in AspNetCore or did they change something?

I can't find anything saying that the parameter can't be called "model" and in previous MVC versions this worked fine.

Version of Microsoft.AspNetCore.Mvc or Microsoft.AspNetCore.App or Microsoft.AspNetCore.All:

CompatibilityVersion.Version_2_1

[devfunkd]

https://stackoverflow.com/questions/51735929/model-property-values-in-aspnetcore-2-1-are-null-on-post-when-action-parameter-i

Seems having a property in my model called "Model" breaks the postback data. I removed the property and the postback works. Why would a property being named "Model" in my model break the postback action?

[pranavkm]

Unfortunately this is by design. See #3735. We're going to try using an analyzer to provide some tooling guidance in this scenario.