Implementing command in Datepicker control

Question

Hi Team,

I am working on a .Net MAUI app (in Visual Studio 2022), Android emulator used is Pixel 5 API 33.

I am working on a MAUI project where for every property and command defined in the xaml of the view, i need to put them in an interface for view model, this interface is then implemented by actual view model class where I need to make sure that I am implementing all such properties and commands.

I have datepicker control where I have defined a behavior to it as toolkit:EventtoCommandBehaviour. for event - DateSelected, I have defined a command as FromDateSelectedCommand, command parameter is "{Binding Date, source ={x:Refernce dtDatepicker}" where dtDatepicker is the name of the datepicker. Date is the Date property of the datepicker, this property is bind to another viewmodel property.

Can you please let me know how could I define and implement above mentioned command in viewmodel interface/class.

If I just have to implement it using viewmodel, code that works is -

[RalayCommand]

private void FromDateSelected(DateTime date)

{

}

Now since I have to first define this command in viewmodel interface and implement it in viewmodel class, i am facing issues.

Please let me know if more detail is needed.

Thanks,

Salil

Thanks,

Salil

Answer 1

Hello,

Can you please let me know how could I define and implement above mentioned command in viewmodel interface/class.

You can do this by changing the value of CommandParameter, you can set the reference for your datapicker's x:Name and set the path to the DatePicker's Date property.

 <DatePicker
      x:Name="dtDatepicker"
      >
      <DatePicker.Behaviors>
          <toolkit:EventToCommandBehavior          
               EventName="DateSelected"
               Command="{Binding FromDateSelectedCommand}"
               CommandParameter="{Binding Source={x:Reference dtDatepicker},
                                       Path=Date}"              
              />
      </DatePicker.Behaviors>
  </DatePicker>

After that, you can get the value in the FromDateSelected method of ViewModel, I changed the type of date to object.

[RelayCommand]
public void FromDateSelected(object date)
{
     var res = date;
}

Best Regards,

Leon Lu

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