使用MVVM将datacontext绑定到用户控件

I have a model

我有一个模特

    public class PersonModel : INotifyPropertyChanged
    { 
        private string _firstname;
        public string FirstName 
        { 
            get {return _firstname; }
            set { _firstname = value; RaisePropertyChanged("FirstName"); } 
        }

        private string _lastname;
        public string LastName
        {
            get { return _lastname; }
            set { _lastname = value; RaisePropertyChanged("LastName"); }
        } 

        public string FullName 
        {
            get { return string.Format("{0} {1}", FirstName, LastName); } 
        }


        protected void RaisePropertyChanged(string propertyName)
        {
            var handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
    } 
    public class Pers