f＃type provider使用简单的groupby和count

Question

为什么不编译

open System
open System.Data
open System.Data.Linq
open System.Linq
open Microsoft.FSharp.Data.TypeProviders
open Microsoft.FSharp.Linq
open Microsoft.FSharp.Linq.RuntimeHelpers

type dbSchema = SqlDataConnection<"Data Source=.;Initial Catalog=MyDatabase;Integrated Security=SSPI;">
let db = dbSchema.GetDataContext()

query {
    for row in db.Table1 do
    groupBy row.Id into gr
    select( gr.Key (gr.Count()))
    }
 |> Seq.iter (fun row -> printfn "Found row: %d" row.Count)

我在行

中遇到编译错误

select( gr.Key (gr.Count()))

有错误错误：此值不是函数且无法应用

Answer 1

我知道了，它丢失了，在密钥和计数之间