c＃我想知道字符串中的前3个字符是否是字母？

Question

I'm developing a license plate number recognition system. The plate numbers in our county has a string length of 6-7. The first 2 or 3 character are letters and the rest are numbers.

I want to check when my system detect a object and recognize it then if the output has the format of 3 letters and followed by numbers.

Answer 1

var input = "abc123";
var result = input.Take(3).All(char.IsLetter);

Answer 2

this will help a lot. I suggest that you also do validation not to allow charactors like *&&$%$^@)&(& as this will break your application. Good Luck!

http://www.dotnetperls.com/substring