These links didn\'t help me:
Example:
//Model:
public class Group
{
public int Id { get; set; }
Please see below link for detail implementation: https://github.com/iLexDev/ASP.NET-WebApi-MultipartDataMediaFormatter
Nuget: https://www.nuget.org/packages/MultipartDataMediaFormatter/
I actually need to do "multipart/form-data" file upload and model binding today, I tried above lib from nuget and turns out it works as my expectation. Validation on model also works fine. Hopefully it helps to answer your question.