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Using PDF for UWP / Adding Text / Measuring Text
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    Measuring Text
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    In many cases, you will need to check whether the string will fit on the page before you render it. You can use the C1PdfDocument.MeasureString method for that. C1PdfDocument.MeasureString returns a SizeF structure that contains the width and height of the string (in points) when rendered with a given font.

    For example, the code below checks to see if a paragraph will fit on the current page and creates a page break if it has to. This will keep paragraphs together on a page:

    Visual Basic
    Copy Code 
    Private Function RenderParagraph(text As String, font As Font, rect As Rect, rectPage As Rect) As Rect

    ' Calculate the necessary height.
    Dim sz As SizeF = _c1pdf.MeasureString(text, font, rect.Width)
    rect.Height = sz.Height

    ' If it won't fit this page, do a page break.
    If rect.Bottom > rectPage.Bottom Then
        _c1pdf.NewPage()
        rect.Y = rectPage.Top
    End If

    ' Draw the string.
    _c1pdf.DrawString(text, font, Colors.Black, rect)

    ' Update rectangle for next time.
    Rect.Offset(0, rect.Height)
    Return rect
End Function

' Use the RenderParagraph method.
Dim font As New Font("Arial", 10)
Dim rectPage As Rect = _c1pdf.PageRectangle()
rectPage.Inflate(-72, -72)
Dim rect As Rect = rectPage
Dim s As String
For Each s In  myStringList
    rect = RenderParagraph(s, font, rect, rectPage)
Next s

    C#
    Copy Code 
    private Rect RenderParagraph(string text, Font font, Rect rect, Rect rectPage)
{
    // Calculate the necessary height.
    SizeF sz = _c1pdf.MeasureString(text, font, rect.Width);
    rect.Height = sz.Height;

    // If it won't fit this page, do a page break.
    If (rect.Bottom > rectPage.Bottom)
    {
        _c1pdf.NewPage();
        rect.Y = rectPage.Top;
    }

    // Draw the string.
    _c1pdf.DrawString(text, font, Colors.Black, rect);

    // Update rectangle for next time.
    Rect.Offset(0, rect.Height);
    return rect;
}

// Use the RenderParagraph method.
Font font = new Font("Arial", 10);
Rect rectPage = _c1pdf.PageRectangle();
rectPage.Inflate(-72, -72);
Rect rect = rectPage;
foreach (string s in myStringList)
{
    rect = RenderParagraph(s, font, rect, rectPage);
}