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Text length measurement? It’s really easy with WPF

Don’t you remember how it was to measure the length of your text in pixels? Do you really remember methods named GetLineFromCharIndex, Bounds and MeasureText?

Let’s do it in WPF:

TextBox myText = new TextBox();
Rect textRext = myText.GetRectFromCharacterIndex(myText.Text.Length);

That’s all, folks. Now you have the boundaries of your text in pixels. You can even measure the size of text up to your cursor position by using CaretIndex property of TextBox. Don’t it really easy?


<Window x:Class="TextMeasurement.Window1"
    Title="TextMeasurement" Height="300" Width="300"
    <StackPanel Orientation="Horizontal">
      <TextBlock>The text length is:  </TextBlock>
      <TextBlock Name="mySize" Text="{Binding ElementName=myWindow, Path=TextSize}"/>
    <TextBox Name="myText" TextChanged="onChanged"/>


public partial class Window1 : System.Windows.Window
    public static readonly DependencyPropertyKey TextSizePropertyKey = DependencyProperty.RegisterReadOnly("TextSize",
        typeof(double), typeof(Window1),
        new UIPropertyMetadata((double)0));
    public static DependencyProperty TextSizeProperty = TextSizePropertyKey.DependencyProperty;
    public double TextSize
        get { return (double)GetValue(TextSizeProperty); }
    public Window1()
    void onChanged(object sender, TextChangedEventArgs e)
        Rect textRext = myText.GetRectFromCharacterIndex(myText.Text.Length);
        SetValue(TextSizePropertyKey, textRext.Right);
Have a nice day with WPF :)
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One Response to “Text length measurement? It’s really easy with WPF”

  1. Just code - Tamir Khason Says:

    We already know how to measure text length in TextBox , but if you’ll try to do it in TextBlock, you’ll

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