SubScript and SuperScript in TextBlock

I'll try to give you a more complete answer for anyone googling this issue.

Silverlight_kid was right in saying that sub/superscript in Silverlight is limited due to not supporting "BaseLineAlignment", but not in saying that it is then only possible with positioning. 

You can achieve limited sub/superscript without positioning (limited to numbers and basic arithmetic) by using unicode letters. Hopefully, Silverlight will be updated in the near future to support this. Until then, I will be working on getting the positioning working correctly and easily. I have to for a project anyway and I might as well release the code if I can manage it.

Other Notes:

1. Silverlight (more accurately, the Portable User Interface font that Silverlight defaults to) only supports versions of Unicode through Unicode 2.1, not the latest version (5.2).

2. To construct a string with unicode characters, you need a backslash followed by an 'x' followed by the four digit hex code for that character. Only characters in the Basic Multilingual Plane (0000-FFFF) are supported. See examples.

string water = "H" + "\x2082" + "O"; // You can split the string up if you want. 

string ammonia = "NH\x2083"; // Or not split it.

string energy = "e=mc\x00B2"; // Most well-known, poorly understood equation.

string PythagoreanTheorem = "a\x00B2+b\x00B2=c\x00B2"; \\ Also well-known.

3. Character reference.

Superscript:

0 : U+2070

1 : U+00B9

2 : U+00B2

3 : U+00B3

4-9 : U+2074-2079

+ : U+207A

- : U+207B

= : U+207C

( : U+207D

) : U+207E

n : U+207F

Subscript

0-9 : U+2080-2089

+ : U+208A

-: U+208B

=: U+208C

(: U+208D

): U+208E

 

 

I know the question is a little old, but I thought I'd add a comment anyway. You can use unicode letters in xaml like you would use any other special characters in xml:

'>': > or b

"m³": "m³"

"H₂O": "H₂O"

"eⁿ": "eⁿ"

You probably get the drift.

I haven't tried all the codes posted by lordcheeto, but they should work.