XML提供程序無法識別標簽

Question

我正在使用XML提供程序來處理xml文件，或者正在嘗試使用它。 看下面的代碼：

open System
open System.IO
open System.Xml.Linq
open FSharp.Data
open System.Net

type InputXml = XmlProvider<"C:\Temp\sample.xml">

[<EntryPoint>]
let main argv =

    let input = InputXml.Load("C:\Temp\sample.xml")

    for customer in input.GetCustomers() do
        for order in customer.GetOrders() do
            for line in order.GetOrderLines() do
                printfn "Customer: %s, Order: %s, Item: %s, Quantity: %d" customer.Name order.Number line.Item line.Quantity

    Console.ReadLine() |> ignore
    0 // return an integer exit code

我有編譯器錯誤

Lookup on object of indeterminate type based on information prior to this program point. A type annotation may be needed prior to this program point to constrain the type of the object. This may allow the lookup to be resolved.
Lookup on object of indeterminate type based on information prior to this program point. A type annotation may be needed prior to this program point to constrain the type of the object. This may allow the lookup to be resolved.
Lookup on object of indeterminate type based on information prior to this program point. A type annotation may be needed prior to this program point to constrain the type of the object. This may allow the lookup to be resolved.
Lookup on object of indeterminate type based on information prior to this program point. A type annotation may be needed prior to this program point to constrain the type of the object. This may allow the lookup to be resolved.
Lookup on object of indeterminate type based on information prior to this program point. A type annotation may be needed prior to this program point to constrain the type of the object. This may allow the lookup to be resolved.
Lookup on object of indeterminate type based on information prior to this program point. A type annotation may be needed prior to this program point to constrain the type of the object. This may allow the lookup to be resolved.
The field, constructor or member 'GetCustomers' is not defined  D:\f#\samples\Program.fs    16  27  samples

xml文件結構如下所示：

<?xml version="1.0" encoding="utf-8" ?>
<Customers>
  <Customer name="ACME">
    <Order Number="A012345">
      <OrderLine Item="widget" Quantity="1"/>
    </Order>
    <Order Number="A012346">
      <OrderLine Item="trinket" Quantity="2"/>
    </Order>
  </Customer>
  <Customer name="Southwind">
    <Order Number="A012347">
      <OrderLine Item="skyhook" Quantity="3"/>
      <OrderLine Item="gizmo" Quantity="4"/>
    </Order>
  </Customer>
</Customers>

我究竟做錯了什么？

Answer 1

您使用哪個版本的軟件包？

如果我從NuGet引用當前的2.1.1 ，則XmlProvider就像一個XmlProvider一樣工作，並將節點顯示為屬性。

open System
open FSharp.Data

type InputXml = XmlProvider<"C:\Temp\sample.xml">

[<EntryPoint>]
let main argv =

    let input = InputXml.Load("C:\Temp\sample.xml")

    for customer in input.Customers do
        for order in customer.Orders do
            for line in order.OrderLines do
                printfn "Customer: %s, Order: %s, Item: %s, Quantity: %d" customer.Name order.Number line.Item line.Quantity

    Console.ReadLine() |> ignore
    0 // return an integer exit code