What the best way to use command binding under Microsoft.Toolkit.MVVM

Question

I'm using Microsoft.Toolkit.MVVM, in doc we can use binding Button command like:

<Button Content="Click me!" Command="{Binding ButtonClickCommand}"/>

But for ListView, I have to write like with Behaviors, this code is to long:

<ListView> <i:Interaction.Triggers> <i:EventTrigger EventName="SelectionChanged"> <i:InvokeCommandAction Command="{Binding SelectionChangedCommand}" PassEventArgsToCommand="True"/> </i:EventTrigger> </i:Interaction.Triggers> </ListView>

So why can't use below code instead? This is simple, but not working.

<ListView SelectionChanged={Binding SelectionChangedCommand}/>

They are different types. Command property is of ICommand type, but the SelectionChanged property should be matched with an Event Handler. — Sotiris Panopoulos
– Sotiris Panopoulos, Commented Jan 13, 2022 at 7:35

ZSH · Accepted Answer · 2022-01-13 07:27:09Z

the simple answer is the type of the object in button Command is ICommand and in the ListView the SelectionChanged is an event and not ICommand , this why you need to use eventTrigger which is an "addon"

if you look at it from MVVM perspective the button is here to bind a command the ListView has SelectedItems collection that you can bind to and not the event , but that's more of a choice you need to make (I think that your code looks fine once you are used to it)

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