F＃不区分大小写的字符串比较

Question

是否有一种语法更清晰的方法来在F＃中执行不区分大小写的字符串比较，而不是以下

System.String.Equals("test", "TeSt", System.StringComparison.CurrentCultureIgnoreCase)

Answer 1

此外，您可以使用F# type extensions机制：

> type System.String with
-   member s1.icompare(s2: string) =
-     System.String.Equals(s1, s2, System.StringComparison.CurrentCultureIgnoreCase);;
> "test".icompare "tEst";;
val it : bool = true

Answer 2

如何编写扩展方法以缩短它。

Answer 3

对于任何感兴趣的，部分活动模式：

let (|InvariantEqualI|_|) (str:string) arg = 
  if String.Compare(str, arg, StringComparison.InvariantCultureIgnoreCase) = 0
  then Some() else None
let (|OrdinalEqualI|_|) (str:string) arg = 
  if String.Compare(str, arg, StringComparison.OrdinalIgnoreCase) = 0
  then Some() else None

Answer 4

// Contains substring
(str1.ToUpper()).Contains (str2.ToUpper())
// Equality
(str1.ToUpper()).Contains (str2.ToUpper())