i want to pass a parameter in a xaml button - xamarin

Question

hello i want to pass the Label with the button in xaml
its a list view and each row has her own Label and i want update each row by the label
<Label Grid.Column="2"
Grid.Row="1"
Text="{Binding Label}"
FontSize="20"
TextColor="Black"
Margin="0,10,0,0"
FontFamily="{StaticResource font}"
HorizontalOptions="Start"
VerticalOptions="Center"/>
<ImageButton Grid.Column="2"
Grid.Row="0"
HorizontalOptions="End"
VerticalOptions="End"
Source="plus.png"
Margin="9"
clicked ="update"
BackgroundColor="Transparent"/>
and the function in the class
public void update (object sender , EventArgs e)
{
update by the Label
}
i know that's there is something with commands but i'm beginner and i don't know how to use it i tried this and i didn't work.
Command="{Binding Path=BindingContext.UpdateCommand, Source={x:Reference Name=listViewEvent}}"
CommandParameter="{Binding Label}"
and the function is this
UpdateCommand = new Command<string>(async (args) => {
String Label = args as string;
DisplayAlert("update", "update", "OK");
_ = Navigation.PushAsync(new AddReminder(Label));
});
and the alert didn't show
please i need help

Answer 1

you don't need to "pass" the Label
<ImageButton Grid.Column="2" Cilcked="update" ... />
protected void update(object sender, EventArgs a)
{
var btn = (ImageButton)sender;
// MyClassName should be the name of your model class
// this will get you the object referenced by the selected row
var item = (MyClassName)btn.BindingContext;
// then you can reference any property of item
// ie, item.Label, etc
}

Answer 2

<Label x:Name="myLabel"
Grid.Column="2"
Grid.Row="1"
Text="{Binding Label}"
FontSize="20"
TextColor="Black"
Margin="0,10,0,0"
FontFamily="{StaticResource font}"
HorizontalOptions="Start"
VerticalOptions="Center"/>
<ImageButton Grid.Column="2"
Grid.Row="0"
HorizontalOptions="End"
VerticalOptions="End"
Source="plus.png"
Margin="9"
clicked ="update"
BackgroundColor="Transparent"
CommandParameter={x:Reference myLabel}/>
And then in code behind you can get the label
protected void update(object sender, EventArgs a)
{
var btn = (ImageButton)sender;
var label = btn.CommandParameter as Xamarin.Forms.Label;
}