CODEWITHSUNDEEP
c#wpfxamldatepicker
Marcos Brinner pikatoons
Marcos Brinner pikatoons

Reputation: 349

WPF - DatePicker Masked input

I'm developing an WPF application and I got two datepicks input where use can select the date, But I am having some problem with these inputs cause the user can write whatever they want on it as in the image bellow

enter image description here

Is there some way to mask this inputs ? as dd/mm/yyy to only allow users to write dates and it automatically inserts the / slash ?

I tried follow this example but didn't work as it only formate the date after the user choose it from the calendar

I know that there are some "masked inputs" but they don't work with datepicker input

Thanks in Advance.

EDIT

here is my xaml code 

<Border Grid.Column="0" Grid.Row="1" Margin="10 0 0 0" Style="{StaticResource InputBorder}" Height="30" VerticalAlignment="Top">
    <DatePicker  x:Name="EDT_DATA_INICIAL"></DatePicker>
</Border>

<Border Grid.Column="1" Grid.Row="1" Margin="10 0 10 0" Style="{StaticResource InputBorder}" Height="30" VerticalAlignment="Top">
   <DatePicker  x:Name="EDT_DATA_FINAL"></DatePicker>
</Border>

Upvotes: 1

Views: 3255

Answers (2)

Marcos Brinner pikatoons
Marcos Brinner pikatoons

Reputation: 349

Just complementing the @Tronald's answer I'am using his event PreviewTextInput

and I complementend it using this code in a keyUp event

 private void SetDateFormat(object sender, KeyEventArgs e)
    {
        DatePicker dt = (DatePicker)sender;
        string justNumbers = new String(dt.Text.Where(Char.IsDigit).ToArray());
        if (justNumbers.Length == 8)
        {
            string newDate = justNumbers.Insert(2, "/").Insert(5, "/");
            try
            {
                dt.SelectedDate = DateTime.Parse(newDate);
            }catch(Exception ex)
            {
                dt.text = "";
            }
        }
    }

That format the date when use only digite numbers or ex : 18061993 > 18/06/1993 and when the date is incorrect it clears the input preventing errors

enter image description here

Upvotes: 3

Tronald
Tronald

Reputation: 1585

Create a PreviewTextInput event in your DatePicker and handle the logic in there. The below example will restrict input to numbers and "/" only. You will have to figure out how to automatically input the "/" on your own if you wish to do that.

Maybe loop through each character of the string as it's built and determine if you need to add the "/" at a certain point. You can e.Handled = true to block the user input then set the DatePicker.Text as required. This should be enough to get you started.

private void DatePicker_PreviewTextInput(object sender, TextCompositionEventArgs e)
    {
        DatePicker dp = (DatePicker)sender;
        Regex regex = new Regex("[^0-9/]"); //regex that matches allowed text
        e.Handled = regex.IsMatch(e.Text);

    }

Regex reference isSystem.Text.RegularExpressions

Upvotes: 1

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