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[Command creation]
1) Button press
2) Set Item selected in list box 1 to Selected = false
* Currently, List box 1 displays Selected = true
private void left2rightCommandExecute (object parameter)
{
I will write processing here
}
In MVVM, instead of writing an event handler in the code-behind, is it okay to write a command to the ViewModel as above and bind it with the xaml of the view? (= Do not write anything other than InitializeComponent () in code-behind)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ComponentModel;
using TestDialog.Common;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Data;
namespace Test.ViewModels
{
class MainViewModel: ViewModelBase
{
private ObservableCollection<ItemViewModel>_Items;
public ObservableCollection<ItemViewModel>Items
{
get
{
return _Items;
}
set
{
SetProperty (ref _Items, value);
}
}
public ICollectionView LeftView {get;}
public ICollectionView RightView {get;}
public MainViewModel ()
{
Items = new ObservableCollection<ItemViewModel>();
Items.Add (new ItemViewModel () {Name = "C1", Selected = true});
Items.Add (new ItemViewModel () {Name = "C2", Selected = false});
Items.Add (new ItemViewModel () {Name = "C3", Selected = true});
LeftView = new CollectionViewSource {Source = Items} .View;
LeftView.Filter = x =>(x as ItemViewModel) .Selected == true;
RightView = new CollectionViewSource {Source = Items} .View;
RightView.Filter = x =>(x as ItemViewModel) .Selected == false;
}
public class ItemViewModel: ViewModelBase
{
private bool _Selected;
public bool Selected
{
get {return _Selected;}
set
{
SetProperty (ref _Selected, value);
}
}
private string _Name;
public string Name
{
get {return _Name;}
set
{
SetProperty (ref _Name, value);
}
}
}
private void left2rightCommandExecute (object parameter)
{
}
}
}-
Answer # 1
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There is no problem with the code presented.
After that, create a property of the class that implements ICommand and hit the left2rightCommandExecute method with it.
It is recommended to use the MVVM infrastructure instead of writing classes that implement ICommand yourself.
In the current code, there is no room for using event handlers, so you can't use code-behind, right?
If you are conscious of MVVM as you have already experienced, there will be fewer opportunities for natural and code-behind appearance.
When that happens, humanity wants to eliminate code-behind, right?
If you rarely use it, you will forget it.
You can only write (write) in the code-behind because it is completed in View. Putting it in the control library will improve maintainability and testability.
--- Add code ---
C # 7.X is like this.