What is the ModelState class in MVC 3?

asp.net-mvc-3 modelstate
Frank picture Frank · Apr 13, 2013 · Viewed 10.8k times · Source

I am learning MVC, and in ASP.Net MVC 3, what is the ModelState class ? I have looked on Google and MSDN, but I can't seem to get a clear understanding of it's purpose. Can anyone help?

Answer

Steven V picture Steven V · Apr 13, 2013

Take a look at http://www.gxclarke.org/2010/05/consumption-of-data-in-mvc2-views.html under the ViewData.ModelState section.

The ModelState property is a dictionary object that tracks HTTP values submitted to the server. In addition to storing the name and value of each field, it also tracks associated validation errors. Although its name may suggest otherwise, ModelState isn’t Model-aware. It doesn’t understand what a "Product" is. It simply contains a collection of items with names such as "ProductName" and "UnitPrice". It is the responsibility of other objects—ModelBinders, ViewResult, and the strongly-typed View—to map and interpret ModelState values as Model properties

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