如何将我的 RoutedCommand 处理程序从 View-codebehind 移动到 ViewModel？
以下 RoutedCommand 示例有效。
但是，执行命令的按钮的处理位于视图的代码隐藏中。 按照我理解 MVVM 的方式，它应该在 ViewModel 中。
但是，当我将该方法移至 ViewModel（并将其更改为公共）时，出现错误“ManagedCustomersView 不包含 OnSave 的定义”。 即使我将 RoutedCommand 第二个参数更改为 typeof(ManageCustomersViewModel)，我也会收到相同的错误。
如何将命令处理程序从 View-codebehind 移动到 ViewModel？
ManageCustomersView.xaml:
<UserControl.CommandBindings>
<CommandBinding Command="local:Commands.SaveCustomer" Executed="OnSave"/>
</UserControl.CommandBindings>
...
<Button Style="{StaticResource formButton}"
Content="Save"
Command="local:Commands.SaveCustomer"
CommandParameter="{Binding Id}"/>
ManageCustomersView.xaml.cs:
private void OnSave(object sender
, System.Windows.Input.ExecutedRoutedEventArgs e)
{
int customerId = ((int)e.Parameter);
MessageBox.Show(String.Format
("You clicked the save button for customer with id {0}.", customerId));
}
命令.cs：
using System.Windows.Input;
using TestDynamicForm123.View;
namespace TestDynamicForm123
{
public class Commands
{
public static RoutedCommand SaveCustomer =
new RoutedCommand("SaveCustomer", typeof(ManageCustomersView));
}
}
The following RoutedCommand example works.
However, the handling for the button which executes the command is in the codebehind of the view. The way I understand MVVM, it should be in the ViewModel.
However, When I move the method to the ViewModel (and change it to public), I get the error "ManagedCustomersView does not contain a definition of OnSave". Even if I change the RoutedCommand second parameter to typeof(ManageCustomersViewModel), I get the same error.
How can I move the command handler from the View-codebehind to the ViewModel?
ManageCustomersView.xaml:
<UserControl.CommandBindings>
<CommandBinding Command="local:Commands.SaveCustomer" Executed="OnSave"/>
</UserControl.CommandBindings>
...
<Button Style="{StaticResource formButton}"
Content="Save"
Command="local:Commands.SaveCustomer"
CommandParameter="{Binding Id}"/>
ManageCustomersView.xaml.cs:
private void OnSave(object sender
, System.Windows.Input.ExecutedRoutedEventArgs e)
{
int customerId = ((int)e.Parameter);
MessageBox.Show(String.Format
("You clicked the save button for customer with id {0}.", customerId));
}
Commands.cs:
using System.Windows.Input;
using TestDynamicForm123.View;
namespace TestDynamicForm123
{
public class Commands
{
public static RoutedCommand SaveCustomer =
new RoutedCommand("SaveCustomer", typeof(ManageCustomersView));
}
}
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您将公开引用该命令的 ViewModel 的属性。
然后在 XAML 中
，但是您可能会发现使用 RelayCommand 更容易，所以您也可以在模型中定义实际的命令逻辑。
You'll expose a property off your ViewModel that references the command.
Then in the XAML
However you might find it easier to use the RelayCommand so that you can define the actual command logic in your model as well.