Model Property set in controller not showing up in view

Question

This is a pretty simple example.

controller

[httppost]
public ActionResult MyPage(MyModelClass myModel) {
    myModel.someProperty = "b";
    return view(myModel)
}

The typed view contains a hidden field for someProperty

@Html.HiddenFor(model => model.someProperty)

The Get controller sets someProperty to "a"

Yet after a post the value of someProperty in the view is still "a"

That doesn't seem rigth to me. Any insights? Thx

Answer 1

ModelState keeps the posted value 'a'. And as it has higher priority in populating model values (than the model itself), view renders 'a'. You could remove value from ModelState and let model value be used

[HttpPost]
public ActionResult MyPage(MyModelClass myModel) {
    myModel.someProperty = "b";

    ModelState.Remove("someProperty");    

    return view(myModel);
}