Datepicker Binding Xamarin Forms

问题

<DatePicker Date="date" Format="d MMM yyyy" HorizontalOptions="EndAndExpand" x:Name="date"/>

By having that line of code in my xaml code. how can i set the date to NOW when i create a new data?

回答1:

You can either change the Date attribute to something like this: Date="{Binding MyDate}" and then in your code-behind assign a view model to the BindingContext property. For example:

public class MyViewModel
{
    public DateTime MyDate { get; set; }
}

and in your page:

public class MyPage
{
    public MyPage()
    {
        InitializeComponent();

        var viewModel = new MyViewModel();
        viewModel = DateTime.Now;

        BindingContext = viewModel;
    }
}

Or, if you don't need to use a view model or MVVM (which I would highly recommend), you can just set it directly from your code-behind. Because you gave the DatePicker an x:Name attribute, you can refer to it by that name.

public class MyPage
{
    public MyPage()
    {
        InitializeComponent();

        date.Date = DateTime.Now;
    }
}

回答2:

You can define it in two ways

1. Using the "x:Name" you can define the date in XAML.cs.
2. Using the Binding property for "Date" you can define the date in ViewModel class

In your case in xaml.cs

date.Date = DateTime.Now;

来源：https://stackoverflow.com/questions/51239130/datepicker-binding-xamarin-forms