有沒有辦法在F＃中封裝一個模式？

Question

有沒有辦法在F＃中封裝一個模式？

例如，而不是寫這個...

let stringToMatch = "example1" 

match stringToMatch with 
| "example1" | "example2" | "example3" -> ... 
| "example4" | "example5" | "example6" -> ... 
| _ -> ... 

是否有某種方式來完成這些方針的東西...

let match1to3 = | "example1" | "example2" | "example3" 
let match4to6 = | "example4" | "example5" | "example6" 

match stringToMatch with 
| match1to3 -> ... 
| match4to6 -> ... 
| _ -> ... 

Answer 1

你可以用活動模式做到這一點：

let (|Match1to3|_|) text = 
    match text with 
    | "example1" | "example2" | "example3" -> Some text 
    | _ -> None 

let (|Match4to6|_|) text = 
    match text with 
    | "example4" | "example5" | "example6" -> Some text 
    | _ -> None 

match stringToMatch with 
| Match1to3 text -> .... 
| Match4to6 text -> .... 
| _ -> ...