Visible line count of a TextBlock

Question

If you set TextWrapping to \"Wrap\", a WPF TextBlock can have several lines of text. Is there a \"clean\" way to get the number of lines of text? I considered looking at the

Answer 1

I have seen that this question is already 7 years old, but I just came with a solution:

The TextBlock have a private property called LineCount. I created an extension method to read this value:

public static class TextBlockExtension
{
    public static int GetLineCount(this TextBlock tb)
    {
        var propertyInfo = GetPrivatePropertyInfo(typeof(TextBlock), "LineCount");
        var result = (int)propertyInfo.GetValue(tb);
        return result;
    }

    private static PropertyInfo GetPrivatePropertyInfo(Type type, string propertyName)
    {
        var props = type.GetProperties(BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.NonPublic);
        return props.FirstOrDefault(propInfo => propInfo.Name == propertyName);
    }
}