binding WPF DatePicker to string property [duplicate]

Question

I want to bind DatePicker to string property of viewmodel. Trouble is to set proper string format. It's problem-specific to store date in string property.

Binding works fine except string format. My xaml is:

<DatePicker SelectedDate="{Binding Value, StringFormat=dd.MM.yyyy}"/>

I expect of string 15.08.2019, but string is 8/15/2019 12:00:00 AM

[Edit] This question is not duplicate. Changing string format of DatePicker's TextBox by style only affects itself, not binding.

Changing string format of DatePicker's TextBox by style only affects itself, not binding. — Michael Mankiewicz
– Michael Mankiewicz, Commented Aug 8, 2019 at 9:43
It's probably a better idea to change the ViewModel so that it Outputs a ´´´DateTime´´´ property. You could parse the string you already have through ´´´DateTime.Parse´´´ — S Schulze
– S Schulze, Commented Aug 8, 2019 at 10:39
It's not possible. One row is ExpandoObject with custom oblects, depending on the type of "column" (Enum) DataTemplateSelector returns appropriate editor for cell... All data stored in string. — Michael Mankiewicz
– Michael Mankiewicz, Commented Aug 9, 2019 at 7:47

Aakanksha · Accepted Answer · 2019-08-08 08:57:48Z

0

You need to Change the Template of DatePickerTextBox

<DatePicker SelectedDate="{Binding Path = Value, StringFormat = {}{0:dd.MM.yyyy}}">
    <DatePicker.Resources>
        <Style TargetType="DatePickerTextBox">
            <Setter Property="Control.Template">
                <Setter.Value>
                    <ControlTemplate>
                        <TextBox x:Name="PART_TextBox" Text="{Binding Path=SelectedDate, StringFormat = {}{0:dd.MM.yyyy}, RelativeSource={RelativeSource AncestorType={x:Type DatePicker}}}" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DatePicker.Resources>
</DatePicker>

answered Aug 8, 2019 at 8:57

Aakanksha

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1 Comment

Michael Mankiewicz Over a year ago

This xaml changes string format in DatePiker's editor, but not applies to viewmodel's property. I already tried this solution and it doesn't work for me.

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