Question

我有MedicicineModel（MainViewModel类）和MedicineData（ItemViewModel类）。我在MedicineData类中定义了三个属性，如下所示：

namespace MedicinePlus.ViewModels
{
    public class MedicineData
    {
        public string ProblemName { get; set; }
        public string ProblemDesc { get; set; }
        public string ProblemImageFilePath { get; set; }
    }
}

MedicineModel类如下：

namespace MedicinePlus.ViewModels
{
public class MedicineModel
{
    public List<MedicineData> Problems { get; set; }
    public MedicineModel()
    {
        this.Problems = new List<MedicineData>();
    }

    public bool IsDataLoaded { get; set; }

    public void LoadData()
    {
    //place design time datat here
        IsDataLoaded = true;
        this.Problems.Add(new MedicineData() { ID = 0, ProblemName = "Fever",  ProblemDesc = "rise in body temperature", ProblemImageFilePath = "/Assets/Images/fever.png" });
        this.Problems.Add(new MedicineData() { ID = 2, ProblemName = "sprain", ProblemDesc = "Caused due to muscle pull", ProblemImageFilePath = "/Assets/Images/sprain1.png" });
        this.Problems.Add(new MedicineData() { ID = 3, ProblemName = "bruise", ProblemDesc = "irritation in the concerned area", ProblemImageFilePath = "/Assets/Images/headache.png" });

    }

}
}

MainPage.xaml.cs如下：

namespace MedicinePlus
{
public partial class MainPage : PhoneApplicationPage
{
    // Constructor
    public MainPage()
    {
        InitializeComponent();

        // Set the data context of the listbox control to the sample data
        DataContext = App.ViewModel;

        // Sample code to localize the ApplicationBar
        BuildLocalizedApplicationBar();
    }

    // Load data for the ViewModel Items
    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        if (!App.ViewModel.IsDataLoaded)
        {
            App.ViewModel.LoadData();
        }
    }
private void submitMenu_Click(object sender, EventArgs e)
    {
        throw new NotImplementedException();
    }
}

QUERY：现在我想在submit_Click事件处理程序的代码块中访问ProblemName，ProblemDesc和ProblemImgPath。我该怎么做

Answer 1

您必须创建MedicineData，

的实例

MedicineData medicineData = new medicineData();

然后您可以像以下一样访问它们：

medicineData.ProblemName
medicineData.ProblemDesc

和

medicineData.ProblemImageFilePath

Answer 2

您还没有真正提供足够的信息让我们明确回答，所以我们所能做的就是猜测。例如，App.ViewModel属性中的对象是什么？它是MedicineModel实例吗？如果是，那么你似乎忽视了这个属性。您当然可以使用它访问您的视图模型及其数据吗？：

private void submitMenu_Click(object sender, EventArgs e)
{
    MedicineModel viewModel = App.ViewModel;
    List<MedicineData> problems = viewModel.Problems;
    string problemName = problems[0].ProblemName;
}

如果这不是你所追求的，那么也许你已经足够好，可以更准确地告诉我们你的需求和你遇到的问题。

如何访问Mainpage.xaml.cs中ItemViewModel类中定义的属性

2 个答案: