FileExOpenDialog 方法

public static bool OpenDialog(
	ref string filename,
	string filter = "",
	string defaultExt = ""
)

Public Shared Function OpenDialog ( 
	ByRef filename As String,
	Optional filter As String = "",
	Optional defaultExt As String = ""
) As Boolean

static member OpenDialog : 
        filename : string byref * 
        ?filter : string * 
        ?defaultExt : string 
(* Defaults:
        let _filter = defaultArg filter ""
        let _defaultExt = defaultArg defaultExt ""
*)
-> bool