The difference between the Char.isdigit and Char.isnumber of "C # relic"

The original: The difference between the Char.isdigit and Char.isnumber of "C # relic"

The two methods of isdigit and isnumber in char are used to determine if a character is a number, so what's the difference between them?

The isdigit judge is the decimal number, is ' 0 '. ' 9 '.
Isnumber determines the number category, including the decimal number ' 0 '. ' 9 ', also a number represented by a letter, such as the letter ' V ' representing the Roman numeral 5, and a character representing another number, such as a character representing "1/2".

The difference between the Char.isdigit and Char.isnumber of "C # relic"