C # language escape characters (\xhhhh and \UDDDD)

The C # language transit character is not the same as the escape characters of the C + + language, but some are generic. The escape characters in the C # language are as follows (perhaps less complete, this is a summary of personal practice, and many of the articles reproduced on the web are confusing with the escape characters in C + +.) ）
\ ' (single quotation mark 0x0027)
\ "(double quote 0x0022)
\ \ (backslash 0x005c)
(Null character 0x0000)
\a (Making a sound bell 0x0007)
\b (backspace 0x0008)
\ n (newline 0x000a)
\ r (carriage return 0x000d)
\xhhhh (HHHH is a hexadecimal encoding for characters, which can be up to 4 digits, not 4 digits, and the principle is 1-4 bits.) Most of the time, however, the characters following the \x will automatically take 4 digits between 0-9 or a-f/a-f. That is to say: (1) A character end escape with the first range not 0-9 or a-f/a-f is encountered, (2) a 4-digit end Escape is reached, (3) if the first character after \x does not meet 0-9 or a-f/a-f the compilation does not pass (VS2008).
\uhhhh (HHHH for hexadecimal Unicode character encoding, char in C # two bytes, hhhh must take 4 digits)