标题：检测 identify列

'datatables2json

Dim names() As String = {"id", "cp", "kh", "gy", "sl", "dj", "zk", "je", "rq"}

Dim caps() As String = {"_identify", "产品", "客户", "雇员", "数量", "单价", "折扣", "金额", "日期"}

Dim zd As New Dictionary(Of String, String)

For i As Integer = 0 To names.Length - 1

    zd.Add(names(i), caps(i))

Next

'生成json数据

Dim t As DataTable = DataTables("订单")

Dim arr As New JArray '数据记录数组

For i As Integer = 0 To t.DataRows.Count - 1 '遍历datatable记录

    arr.Add(New jobject) '每遍历一条记录就增加一个对象，以保存记录数据

    Dim r As DataRow = t.DataRows(i)

    For Each key As String In zd.Keys

        If key = "id" Then

            arr(i)("id") = val(r(zd(key)))

        Else If t.DataCols(zd(key)).IsString Then

        If r.isnull(zd(key)) Then

            arr(i)(key) = ""

        Else

            arr(i)(key) = CStr(r(zd(key)))

        End If 

        Else If t.DataCols(zd(key)).IsNumeric Then

        If r.isnull(zd(key)) Then

            arr(i)(key) = 0

        Else

            arr(i)(key) = val(r(zd(key)))

        End If

        Else If t.DataCols(zd(key)).IsBoolean Then

        arr(i)(key) = CBool(r(zd(key)))

        Else If t.DataCols(zd(key)).IsDate Then

            If r.isnull(zd(key)) Then

                arr(i)(key) = ""

            Else

                arr(i)(key) = CStr(r(zd(key)))

            End If

        End If

    Next

Next

Dim obj As New JObject '创建一个新对象obj

obj("total") = t.DataRows.Count '在obj中以total保存记录总数

Output.Show(arr.ToString)