Windows 8 c#到XAML的数据绑定问题，GUI未更新

我正在尝试使用MVVM设计模式在Windows 8中制作一个简单的测验程序。我尝试使用PRISM和MVVMlite，但我是一个新手，根本没有足够的数据和控制绑定知识，以了解如何正确使用它。我想我的大部分工作，但我有几个主要的问题。1. 我的GUI没有正确更新。2. 我收到了几个错误。3.修复代码的一部分会破坏另一部分。4. 不知道如何从XAML命令中获取"发件人"信息

下面是目前为止的代码: xml数据:

<root>
  <Object>
    <Question>What do you do for work</Question>
    <Answer>Wrestle giant tentical monsters</Answer>
    <Choices>Battle robots</Choices>
    <Choices>Glorious ruler of North Korea</Choices>
    <Choices>Wrestle Giant Tentical Monsters</Choices>
    <Choices>Defender of all that is good</Choices>
  </Object>
  <Object>
    <Question>What do you drive</Question>
    <Answer>Moped</Answer>
    <Choices>Helicopter</Choices>
    <Choices>Pegasus</Choices>
    <Choices>Rocketship</Choices>
    <Choices>Moped</Choices>
  </Object>
</root>

模型:

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.ComponentModel;
 using System.Xml.Linq;
 using System.Windows.Input;
namespace Quiz
    {
    class QuizModel : INotifyPropertyChanged
    {
        private string _question;
        public string Question
        {
            get { return _question; }
            set
            {
                _question = value;
                OnPropertyChanged("Question");
            }
        }
        private string _answer;
        public string Answer
        {
            get { return _answer; }
            set
        {
            _answer = value;
            OnPropertyChanged("Answer");
        }
    }
    private List<string> _choices;
    public List<string> Choices
    {
        get { return _choices; }
        set
        {
            _choices = value;
            OnPropertyChanged("Choices");
        }
    }
    public QuizModel(string quesiton, string answer, List<string> choices)
    {
        Question = quesiton;
        Answer = answer;
        Choices = choices;
    }
    public static List<QuizModel> Query(string datasource)
    {
        XElement quizdata = XElement.Load(datasource);
        List<QuizModel> query = (from d in quizdata.Descendants("Object")
                                 select new QuizModel(
                                             (string)d.Element("Question"),
                                             (string)d.Element("Answer"),
                                             d.Elements("Choices").Select(a => a.Value).ToList()
                                             )).ToList();
        return query;
    }
    public event PropertyChangedEventHandler PropertyChanged;
    public void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

视图模型:

class QuizViewModel
{
    public static List<QuizModel> QuizList { get; set; }
    public static QuizModel Quiz { get; set; }
    public static int Indexer { get; set; }
    public ICommand myCommand { get; set; }
    //Initiallizes view model
    public QuizViewModel()
    {
        Indexer = 0;
        QuizList = QuizModel.Query("Quiz.xml");
        Quiz = QuizList[Indexer];
        myCommand = new ActionCommand(Evaluate);
    }
    //Increments to next question
    private void Evaluate()
    {
        Indexer++;
        Quiz = QuizList[Indexer];
    }
}

iCommand:

public class ActionCommand : ICommand
{
    private readonly Action _action;
    public ActionCommand(Action action)
    {
        _action = action;
    }
    public void Execute(object parameter)
    {
        _action();
    }
    public bool CanExecute(object parameter)
    {
        return true;
    }
    public event EventHandler CanExecuteChanged; //ERROR event Never Used
}
}

视图:

<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
    <Grid.RowDefinitions>
        <RowDefinition Height="1*"/>
        <RowDefinition Height="3*"/>
    </Grid.RowDefinitions>
    <TextBlock FontSize="50" Text="{Binding Quiz.Question}">
        <TextBlock.DataContext>
            <local:QuizViewModel/>  <!--Can't find Quiz.xml-->
        </TextBlock.DataContext>
    </TextBlock>
    <ListView Grid.Row="1" FontSize="30" ItemsSource="{Binding Quiz.Choices}">
        <ListView.DataContext>
            <local:QuizViewModel/> <!--Can't find Quiz.xml-->
        </ListView.DataContext>
        <ListView.ItemTemplate>
            <DataTemplate>
                <Button Content="{Binding Mode=OneWay}" Command="{Binding myCommand}">
                    <Button.DataContext>
                        <local:QuizViewModel/>
                    </Button.DataContext>
                </Button>
            </DataTemplate>
        </ListView.ItemTemplate>
     </ListView>
</Grid>

我有3个电流错误，其中两个是相同的第一个错误是指在xaml数据上下文中:

错误1 (x2)
找不到文件"C:'Users'Me'AppData'Local'Microsoft'VisualStudio'11.0'Designer'ShadowCache'cv0te54x.fpv'5ncl4yxi.hui' quizx .xml"。

错误2无法创建"Quiz"类型的实例。QuizViewModel '

这似乎影响了我的"选择"不填充，我可以通过删除数据上下文来修复这个问题，但是我不能绑定"myCommand"

第三个问题是我如何从命令输入中获取发件人信息，以便我可以评估它是对还是错?