Passing in a DateTime as Command Parameter

Question

Hello , how can I pass a DateTime type into a Command Parameter? In this case I want to try pass Datetime.Now

My Xaml:

<Button Text="Click me" Command="{Binding MyCommand}" VerticalOptions="EndAndExpand" Margin="0,0,0,25"></Button>

My Viewmodule:

public class MainViewModule : INotifyPropertyChanged
    {

        public ICommand MyCommand{ get; }

        public MainViewModule()
        {
            MyCommand= new Command<DateTime>(Foo);
       )
 }


        void Foo(DateTime dateTime)
        {
            Device.BeginInvokeOnMainThread(async () =>
            {
                await App.Current.MainPage.DisplayAlert("", $"you passed {dateTime}", "OK");
            });
        }

Answer 1

Hello,

Welcome to our Microsoft Q&A platform!

You could do this by referencing the System namespace in Xaml. This can be done in the first Xaml element's attributes, e.g.:

<ContentPage   
     ....  
     xmlns:sys="clr-namespace:System;assembly=mscorlib" >  

Then you can pass in the DateTime.Now as a CommandParameter for the button, e.g.:

    <Button Text="Click me" Command="{Binding MyCommand}" CommandParameter="{Binding Source={x:Static sys:DateTime.Now}}" VerticalOptions="EndAndExpand" Margin="0,0,0,25"></Button>  

Then the following Command code should receive the parameter:

        MyCommand = new Command<DateTime>(fooObject =>  
        {              
            //add your code here, fooObject should have your DateTime.Now  
             
        });  

However, since DateTime.Now is globally available, there is no need to do this as you can just get the current DateTime.Now when the command runs.

Best Regards,

Jessie Zhang

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