Subtext for C# label

I need to put some subtext in a Winforms C# labels .Text property. Is there any easy way to do this without writng my own control?

This would be the example i开发者_如何学JAVAn HTML

<sub>1a</sub>

Thanks, Paul.

Here's a link to an already-written control that does exactly this:

http://www.freshnova.com/C-Tutorials/superscript-subscript-label.html

Update: you can also just use a RichTextBox (with BorderStyle none, BackColor control, and ReadOnly true). The RichTextBox's SelectionCharOffset lets you specify the height of text above or below the baseline in pixels, and then set its SelectedText property after each setting of SelectionCharOffset to mix-and-match text of different positions in the one box.

No, you'll have to write your own control.

Just create a new user control within your project and add two labels to it. Then add some server side properties for getting/setting the label values.

Then just add the user control to the page.

If anyone's bothered, I ended up writing my own...

using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Windows.Forms;

namespace XXX.UI.Custom
{
/// <summary>
/// A label which is capable of subscript.
/// 
/// Version: 1.
/// Author: XXX.
/// Date: 15/10/2009.
/// Changes: Initial version.
/// </summary>
public class SubscriptLabel : Label
{
    #region Vars

    // Vars.
    private char _subMark = '`';
    private SolidBrush _brush = new SolidBrush(Color.Black);
    private StringFormat _stringFormat = new StringFormat(StringFormat.GenericTypographic);

    #endregion

    #region Properties

    /// <summary>
    /// Gets or sets the subscript marker.
    /// </summary>
    /// <value>The subscript marker.</value>
    [Description("Marker for start/end of subscript text."),
    Category("Appearance"),
    Browsable(true)]
    public char SubscriptMarker
    {
        get
        {
            return _subMark;
        }
        set
        {
            _subMark = value;
            Invalidate();
        }
    }

    #endregion

    #region Methods

    #region Public

    /// <summary>
    /// Initializes a new instance of the <see cref="SubscriptLabel"/> class.
    /// </summary>
    public SubscriptLabel()
    {
        // Setup text mode.
        _stringFormat.Alignment = StringAlignment.Near;
        _stringFormat.HotkeyPrefix = HotkeyPrefix.Show;
        _stringFormat.LineAlignment = StringAlignment.Near;
        _stringFormat.Trimming = StringTrimming.EllipsisCharacter;
        _stringFormat.FormatFlags = StringFormatFlags.MeasureTrailingSpaces | StringFormatFlags.DisplayFormatControl
            | StringFormatFlags.NoClip | StringFormatFlags.NoFontFallback
            | StringFormatFlags.NoWrap;
    }

    #endregion

    #region Private

    /// <summary>
    /// Measures the Y DSW.
    /// </summary>
    /// <param name="graphics">The graphics.</param>
    /// <param name="text">The text.</param>
    /// <param name="font">The font.</param>
    /// <returns>The size.</returns>
    private SizeF MeasureDSW(Graphics graphics, string text,
        Font font)
    {
        // Init.
        graphics.TextRenderingHint = TextRenderingHint.AntiAlias;

        // Vars.
        StringFormat stringFormat = new StringFormat(StringFormat.GenericTypographic);
        SizeF size = new SizeF();

        // Init.
        stringFormat.Alignment = StringAlignment.Near;
        stringFormat.HotkeyPrefix = HotkeyPrefix.Show;
        stringFormat.LineAlignment = StringAlignment.Near;
        stringFormat.Trimming = StringTrimming.None;
        stringFormat.HotkeyPrefix = HotkeyPrefix.None;
        stringFormat.FormatFlags = StringFormatFlags.MeasureTrailingSpaces | StringFormatFlags.NoClip
            | StringFormatFlags.NoWrap;

        // The string size.
        size = graphics.MeasureString(text, Font,
            Width, stringFormat);

        // Init.
        graphics.TextRenderingHint = TextRenderingHint.SystemDefault;

        return size;
    }

    /// <summary>
    /// The pain method.
    /// </summary>
    /// <param name="e">A <see cref="T:System.Windows.Forms.PaintEventArgs"/> that contains the event data.</param>
    protected override void OnPaint(PaintEventArgs e)
    {
        // Ensure that we have some text to draw.
        if (!string.IsNullOrEmpty(Text))
        {
            // Init.
            float currentX = 0f;
            float currentY = 0f;
            string[] splittedText = Text.Split(SubscriptMarker);

            // Setup graphics.
            e.Graphics.CompositingQuality = CompositingQuality.Default;
            e.Graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            e.Graphics.SmoothingMode = SmoothingMode.Default;
            e.Graphics.TextRenderingHint = TextRenderingHint.SystemDefault;
            e.Graphics.CompositingMode = CompositingMode.SourceOver;

            // Loop around the splitted text.
            for (int i = 0; i < splittedText.Length; i++)
            {
                // Vars.
                int drawSubscript = i % 2;

                // Are we to draw the subscript?
                if (drawSubscript > 0)
                {
                    DrawText(e.Graphics, ref currentX,
                        ref currentY, splittedText,
                        i, true);
                }
                else // Don't draw the subscript?
                {
                    DrawText(e.Graphics, ref currentX,
                        ref currentY, splittedText,
                        i, false);
                }
            }
        }
    }

    /// <summary>
    /// Draws the text onto the control.
    /// </summary>
    /// <param name="graphics">The graphics.</param>
    /// <param name="currentX">The current X.</param>
    /// <param name="currentY">The current Y.</param>
    /// <param name="splittedText">The splitted text.</param>
    /// <param name="i">The current text array position.</param>
    /// <param name="isSubScript">if set to <c>true</c> [is sub script].</param>
    private void DrawText(Graphics graphics, ref float currentX,
        ref float currentY, string[] splittedText,
        int i, bool isSubScript)
    {
        // Vars.
        string[] words = splittedText[i].Split(' ');

        // Loop around all the words.
        foreach (string word in words)
        {
            // Vars.
            string newWord = word + " ";
            float nextPosWord = MeasureDSW(graphics, newWord,
                Font).Width;

            // Are we on the final element?
            if (word == words[words.Length-1] && !isSubScript)
            {
                // Remove the space.
                newWord = newWord.Trim();

                // Re-measure to remove the space.
                nextPosWord = MeasureDSW(graphics, newWord,
                    Font).Width;
            }

            // Are we over the end of the label?
            if ((currentX + nextPosWord) > Width)
            {
                // Add the Y coords.
                currentY += MeasureDSW(graphics, newWord,
                    Font).Height;

                // Reset the X coords.
                currentX = 0;
            }

            // Vars.
            float newCurrentY = currentY;

            // Is this for the sub script characters?
            if (isSubScript)
            {
                // Add offsets.
                newCurrentY += 5 * graphics.DpiY / 96; ;
            }

            // Draw onto the control.
            graphics.DrawString(newWord, Font,
                _brush, currentX, 
                newCurrentY);

            // Add the size onto the X coords.
            currentX += nextPosWord;
        }
    }

    #endregion

    #endregion
}
}

Somebody has mentioned using "character map" tool in this post. Quickest if your labels have static text.

Goto Start->Programs->Accessories->System tools->Character Map. Now select this Character ² from the Characters listed. Click "Select", Click "Copy", Then try to change the text of any control by pasting this Character. It should work.

Button1.Text = "mm²"