C# 错误的编译常量值
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Bad Compile constant value
提问by PositiveGuy
I get "Bad Compile constant value" on this statement.
我在这条语句上得到“错误的编译常量值”。
Regex objCheckNumber = new Regex("^(\d){4}$");
I simply want to set this up to check another string to see if the value entered is 4 digits.
我只是想设置它来检查另一个字符串以查看输入的值是否为 4 位数字。
采纳答案by Mark Rushakoff
C# is trying to interpret \das an escape sequence, and \dis nota valid escape sequence (but \nand \tare, for example). You can either double up the backslashes to escape it ("^(\\d){4}$"), or you can prefix the constant string with an at-sign: @"^(\d){4}$".
C＃试图解释\d为转义序列，以及\d是不是一个有效的转义序列（但\n并\t是，例如）。您可以将反斜杠加倍以将其转义 ( "^(\\d){4}$")，或者您可以在常量字符串前添加 at 符号：@"^(\d){4}$"。
回答by Jason Kresowaty
C# uses \ as an escape character. You need to double up the \to \\.
C# 使用 \ 作为转义字符。你需要加倍的\来\\。
Alternatively, place a @ character before the double-quote:
或者，在双引号之前放置一个 @ 字符：
new Regex(@"^(\d){4}$")
