使用来自其他 ViewModel 的 ObservableCollection 的数据填充 ComboBox

Question

我在 ViewModel1 中有一个 ComboBox，我需要填充它并用另一个 ViewModel2 中的列表更新它

XAML

 <ComboBox ItemsSource="{Binding AllLocations}"/>

ViewModel1

private ObservableCollection<Location> _allLocations = new ObservableCollection<Location>();
public ObservableCollection<Location> AllLocations
{
    get { return _allLocations; }
    set { _allLocations = value; RaisePropertyChanged("AllLocations"); }
}

ViewModel2（我想在 ViewModel1 中使用这个 Collection 来绑定 ComboBox

private ObservableCollection<Location> _locations = new ObservableCollection<Location>();
public ObservableCollection<Location> Locations //Binds with the listbox
{
    get { return _locations; }
    set { _locations = value; }
}

如何将 ObservableCollection 从 ViewModel2 获取到 ViewModel1。它还应该自动更新所做的任何更改。

Answer 1

诀窍是在 ViewModel 1 中使用 ViewModel 2 作为参数。这样您就可以访问 ViewModel 2 中的 ObservableCollection Locations

ViewModel1

private ObservableCollection<Location> _allLocations;
public ObservableCollection<Location> AllLocations
{
    get { return _allLocations; }
    set { _allLocations = value; RaisePropertyChanged("AllLocations"); }
}

public ViewModel1(ViewModel2 vm2 )
{

    AllLocations = vm2.Locations;
}

使用来自其他 ViewModel 的 ObservableCollection 的数据填充 ComboBox

Fill ComboBox with data from ObservableCollection from other ViewModel

c#

wpf

mvvm

combobox

observablecollection