wpf textbox limit text

Angela4eva
Angela4eva used Ask the Experts™
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I have text box in wpf xaml and I want the user to not be able to enter more than 60 characters.. when the starts typing it should tell tem how many charcters they have left to type when they copy paste let them not paste it. I am new to wpf any help appreciated
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gavsmith

Commented:
Set the MaxLength property of the textbox to 60.

Add a label after the textbox and create an event for the textbox.TextChanged event set the Label.Text to be textbox.MaxLength - textbox.Text.Length + " Characters remaining"

With the MaxLength property set I wouldn't worry about being able to paste it will still only allow 60 chars

Regards
Gav
Commented:
Code samples:

xaml

<TextBox Height="23" Name="textbox1" VerticalAlignment="Top" MaxLength="60" TextChanged="textbox1_TextChanged" />
<Label Content=""  Height="37" HorizontalAlignment="Left" Name="label1" VerticalAlignment="Top" Width="197.963" />

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xaml.cs (sorry if your not using c#)

        private void textbox1_TextChanged(object sender, TextChangedEventArgs e)
        {
            label1.Content = (textbox1.MaxLength - textbox1.Text.Length).ToString() + " chars remaining";
        }

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Angela4eva

Author

Commented:
great solution. thank you

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