F#访问控制

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久闻大明

访问控制指定代码的可访问性。通过使用这些，您可以指定数据、方法、类等的作用域。

F#中有3种类型的访问控制：

Public or Default
Private
Internal

F# Public示例

公共访问控制，也称为默认访问控制。它对所有人都是可访问的。如果您没有在代码中显式指定任何访问控制，则默认情况下它遵循公共访问控制。

type AccessControl() = 
 member public x.a = 10 
 member public x.display() = 
  printfn "This is public method"


let ac = new AccessControl()    
ac.display()
printfn "a = %d" ac.a

This is public method
a = 10

F# Private示例

私有访问控制受到的限制最多，范围也有限。F#提供private关键字来声明类或类型中的私有成员。私有的范围仅限于申报的当地挡路。

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type AccessControl() = 
 member private x.a = 10
 member private x.display() = 
  printf "This is private method"

let ac = new AccessControl()
ac.display()         //display method is private so can't be accessable ouside the type
printf "a= %d" ac.a  //variable is private.

error FS0491: The member or object constructor 'display' is not accessible. 
Private members may only be accessed from within the declaring type.

F# Internel 示例

内部访问控制只能从同一程序集访问。程序集是编译器在编译F#代码后自动生成的文件。它可以是动态链接库(DLL)或可执行文件(Exe)。

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type AccessControlIN() = 
 member internal x.a = 10
 member internal x.display() = 
  printfn "This is internal method"
  
let aci = new AccessControlIN()
aci.display()
printfn "a= %d" aci.a

This is internal method
a= 10

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