xamarin.android - 如何在MvxListView中的MvxListView中绑定(bind)ItemClick

在下面的示例中，我想将ItemClick命令绑定(bind)到MvxListView中的Item。
在这里，我的ViewModel中有一个包含“狗”列表的“人”列表。

ItemsSource HasDogs绑定(bind)可以正常工作。

当MvvmCross尝试将ItemClick SelectDogCommand绑定(bind)到Viewmodel中的ICommand时，出现此异常。

[0:]
MvxBind:Warning: 11,30 Unable to bind: source property source not found Property:SelectDogCommand on Person
[0:] MvxBind:Warning: 11,30 Unable to bind: source property source not found Property:SelectDogCommand on Person
12-04 15:05:03.062 I/mono-stdout(16338): MvxBind:Warning: 11,30 Unable to bind: source property source not found Property:SelectDogCommand on Person

希望能对您有所帮助。

这是我的示例:

public class FirstViewModel:MvxViewModel
{
    private List<Person> _persons;
    public List<Person> Persons
    {
      get { return _persons; }
      set { _persons = value; }
    }

    private Cirrious.MvvmCross.ViewModels.MvxCommand<Dog> _selectDog;
    public System.Windows.Input.ICommand SelectDogCommand
    {
        get
        {
            _selectDog = _selectDog ?? new Cirrious.MvvmCross.ViewModels.MvxCommand<Dog>(SelectDog);
            return _selectDog;
        }
    }

    private void SelectDog(Dog item)
    {
        ShowViewModel<DetailViewModel>(new DetailViewModel.Parameters{dog = item});
    }

}

public class Person
{
    private string _name;
    private List<Dog> _hasDogs;

    public List<Dog> HasDogs
    {
      get { return _hasDogs; }
      set { _hasDogs = value; }
    }

    public string Name
    {
      get { return _name; }
      set { _name = value; }
    }
}

public class Dog{...}

Android View Xml:

FirstView:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:local="http://schemas.android.com/apk/res-auto"
    ...>
    <TextView ...
        local:MvxBind="Text Persons"
    <Mvx.MvxListView
        ...
        local:MvxBind="ItemsSource Persons"
        local:MvxItemTemplate="@layout/item_person" />
</LinearLayout>

item_person:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:local="http://schemas.android.com/apk/res-auto"
    ...
    android:layout_height="200dp">
    <TextView
        ...
        local:MvxBind="Text Name" />
    <Mvx.MvxListView
        ...
        local:MvxBind="ItemsSource HasDogs; ItemClick SelectDogCommand"
        local:MvxItemTemplate="@layout/item_dog" />
</LinearLayout>

最佳答案

您的人员列表项的DataContext是Person-因此您的SelectDogCommand需要成为Person类的一部分-例如就像是:

public class Person
{
    private string _name;
    private List<Dog> _hasDogs;

    public List<Dog> HasDogs
    {
      get { return _hasDogs; }
      set { _hasDogs = value; }
    }

    public string Name
    {
      get { return _name; }
      set { _name = value; }
    }

    private Cirrious.MvvmCross.ViewModels.MvxCommand<Dog> _selectDog;
    public System.Windows.Input.ICommand SelectDogCommand
    {
        get
        {
            _selectDog = _selectDog ?? new Cirrious.MvvmCross.ViewModels.MvxCommand<Dog>(dog => _parent.SelectDog(dog));
            return _selectDog;
        }
    }

    private FirstViewModel _parent;
    public Person(FirstViewModel parent)
    {
        _parent = parent;
    }
}

或者，您也可以让Person继承自MvxNavigatingObject(或MvxPropertyChanged或MvxViewModel)-在这种情况下，ShowViewModel方法也将在那里可用。

关于xamarin.android - 如何在MvxListView中的MvxListView中绑定(bind)ItemClick，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/20377851/