I am using asp.net core razor engine. I am trying to set a default value for a text area. I have looked at other posts and I seem to following the advice. However the default value I set does not show up.
Here is my code in my .cshtml page
@Html.TextAreaFor(d=>d.Users_id, new {@Value =TempData["id"]})
That's the wrong way to set a default value. The value of bound inputs is determined by ModelState, which itself is composed of the values from Request, ViewData/ViewBag and finally Model. Despite setting the value attribute to something explicitly, Razor will back fill the value with whatever it finds in ModelState for that property.
If you want a default value, then you can either set it on the property itself:
C# 6
public int Users_Id { get; set; } = 1;
C# Previous
private int? users_Id;
public int Users_Id
{
get { return users_Id ?? 1; }
set { users_Id = value; }
}
Or, set the value manually on your model in your action:
model.Users_Id = TempData["id"];
Obviously, since you're using TempData here, you'll have to go with the second option, but the first method is better if you're dealing with a constant default.
Just bear in mind that, Model is the last source for ModelState, so if you do something like have an action param named users_id (case insensitive) or set ViewBag.Users_Id (again, case insensitive), that will take priority over everything else.
