F# Positional Arguments in Attributes -


I am trying to create an attribute in F # with static arguments, but it has failed all the time. 

  Type ColumnAttribute (? Index: int,? Name: string) = Get Attribute () Mute Index = Index to Temporary Name = Name Member x.Index to get () = Index and Set Value = Index & lt; - get value member x name () = name and set value = with name & lt; - Value Type Substance = {[And Ltf; Column (index = 1) & gt;] name: string [& lt; Column (index = 0) & gt;] ID: int [and lieutenant; Columns (name = "sequence") & gt;] sequence: string}   
 I have tried many different ways but it is closest to me.  
 
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 There are two codes that I see with your code  
     
  1.  To make this work you need to define any-argument constructor for  ColumnAttribute .  
  2.   Index  and  names   integer options  and  string options  again ctively but you can Must be  int  and  string .   
     Try the following  
      Type column attribute (index: int option, name: string option) = attribute () to get the mutual index = index temp Give name = name new () = column attribute (none, none) member X With index (get) = match index Something I - & gt; I None - & gt; 0 and set value = index & lt; - Some value members x Get () = Some names with match names -> En | None - & gt; "" And set the value = name - some value types substance = {[[[& lt; Columns (index = 1) & gt;]: string [& lt; Column (index = 0) & gt;] ID: integer [& lt; Columns (name = "sequence") & gt;] sequence: string}

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