专家坐堂-将新地址组合成新的值写入材料附件字段提示System.InvalidCastException: 无法将类型为“System.String”的对象强制转换为类型“Newtonsoft.Json.Linq.JToken”Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

以文本方式查看主题

-  Foxtable(狐表)  (http://foxtable.net/bbs/index.asp)
--  专家坐堂  (http://foxtable.net/bbs/list.asp?boardid=2)
----  将新地址组合成新的值写入材料附件字段提示System.InvalidCastException: 无法将类型为“System.String”的对象强制转换为类型“Newtonsoft.Json.Linq.JToken”  (http://foxtable.net/bbs/dispbbs.asp?boardid=2&id=189167)

--  作者：cnsjroom
--  发布时间：2023/11/14 17:25:00
--  将新地址组合成新的值写入材料附件字段提示System.InvalidCastException: 无法将类型为“System.String”的对象强制转换为类型“Newtonsoft.Json.Linq.JToken”
材料附件值为：
[{"url":"/Abspath/9b6a93cc-d27c-4e93-a4ba-c0092627274b/9b6a93cc-d27c-4e93-a4ba-c0092627274b.pdf", "name":"EventCode.pdf"}]

代码：实现文件数据的抽取后，将新地址组合成新的值写入材料附件字段
红色部分报错
Dim cmd As New SQLCommand
cmd.Co nne ction Name = "主数据源" \'记得设置数据源名称
cmd.CommandText = "S el ect * From {评查活动案件卷宗材料}"
Dim dt1 As DataTable = cmd.ExecuteReader
Dim ja1 As New JArray
Dim drs1 As List(Of DataRow) = dt1.Select("")
For Each dr1 As DataRow In drs1
Dim json As String = dr1("材料附件").ToString
Dim jsonObjects As JArray = JArray.Parse(json)
Dim firstJsonObject As JObject = jsonObjects(0)
Dim urlValue As String = firstJsonObject("url")
Dim Values() As String
Values = urlValue.split("/")
For Index As Integer = 0 To Values.Length - 1
\' If FileSys.DirectoryExists("D:\\12+3\\myfile\\" & Values(2)) Then
\' If FileSys.FileExists("D: \\ 12 + 3 \\ myfile \\ " & Values(2) & " \\ " & Values(3)) Then
\' Else
\' Output.Show("D:\\12+3\\myfile\\" & Values(2) & "\\" & Values(3))
\' If FileSys.DirectoryExists("C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(2)) Then \'如果目录C:\\MyFolder存在
\' If FileSys.FileExists("C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(2) & "\\" & Values(3)) Then
\' output.Show( Values(3) & "文件已经存在！")
\' Else
\' output.Show( Values(3) & "文件不存在或删除！")
\' FileSys.CopyFile("D:\\12+3\\myfile\\" & Values(2) & "\\" & Values(3), "C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(2) & "\\" & Values(3), True)
\' End If
\' Else
\' FileSys.CreateDirectory("C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id"))
\' If FileSys.FileExists("C:\\MyFolder1\\" & dr1("活动id") & "" & dr1("案件id") & "\\" & Values(2) & "\\" & Values(3)) Then
\' output.Show( Values(3) & "文件已经存在！")
\' Else
\' output.Show( Values(3) & "文件不存在或删除！")
\' FileSys.CopyFile("D:\\12+3\\myfile\\" & Values(2) & "\\" & Values(3), "C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(2) & "\\" & Values(3), True)

\' End If
\' End If
Dim dt As DataTable = cmd.ExecuteReader
Dim drs As List(Of DataRow) = dt1.Select("")
Dim j As New JObject
Dim ja As New JArray
For Each dr As DataRow In drs
Dim jo As New JObject
jo("url") = "C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(2) & "\\"
jo("name") = Values(3)
ja.Add(jo)
Output.show(ja.ToString)
Next
\' End if
\' Else
\' End If
Next
Next

运行提示：
---------------------------
版本:2022.8.18.1
---------------------------
代码执行出错，错误信息：
System.InvalidCastException: 无法将类型为“System.String”的对象强制转换为类型“Newtonsoft.Json.Linq.JToken”。
在 UserCode.Test()
---------------------------
确定
---------------------------

--  作者：有点蓝
--  发布时间：2023/11/14 17:27:00
--
Dim urlValue As String = firstJsonObject("url").tostring()

--  作者：cnsjroom
--  发布时间：2023/11/14 17:52:00
--  回复：（有点蓝）Dim urlValue As String = firstJson...

老师现在能够进行值的josn了但是红色部分会循环四*四也就是每条数据会有重复的十六条产生，有没有办法去重呢？

Dim cmd As New SQLCommand
cmd.Connecti \'记得设置数据源名称
cmd.Com mandText = "Se lect * From {评查活动案件卷宗材料}"
Dim dt1 As DataTable = cmd.ExecuteReader
Dim ja1 As New JArray
Dim drs1 As List(Of DataRow) = dt1.Select("")
For Each dr1 As DataRow In drs1
Dim json As String = dr1("材料附件").ToString
Dim jsonObjects As JArray = JArray.Parse(json)
Dim firstJsonObject As JObject = jsonObjects(0)
Dim urlValue As String = firstJsonObject("url").tostring()
Dim Values() As String
Values = urlValue.split("/")
For Index As Integer = 0 To Values.Length - 1
output.show(Values.Length)
Output.Show(Values(0))
Output.Show(Values(1))
Output.Show(Values(2))
Output.Show(Values(3))
If Values(3) <> "" Then
If FileSys.DirectoryExists("D:\\12+3\\myfile\\" & Values(2)) Then
If FileSys.FileExists("D: \\ 12 + 3 \\ myfile \\ " & Values(2) & " \\ " & Values(3)) Then
Else
If FileSys.DirectoryExists("C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(2)) Then \'如果目录C:\\MyFolder存在
If FileSys.FileExists("C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(2) & "\\" & Values(3)) Then
Else
output.Show( Values(3) & "文件不存在或删除！")
FileSys.CopyFile("D:\\12+3\\myfile\\" & Values(2) & "\\" & Values(3), "C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(2) & "\\" & Values(3), True)
End If
Else
FileSys.CreateDirectory("C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id"))
If FileSys.FileExists("C:\\MyFolder1\\" & dr1("活动id") & "" & dr1("案件id") & "\\" & Values(2) & "\\" & Values(3)) Then
Else
output.Show( Values(3) & "文件不存在或删除！")
FileSys.CopyFile("D:\\12+3\\myfile\\" & Values(2) & "\\" & Values(3), "C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(2) & "\\" & Values(3), True)
End If
End If
Dim j As New JObject
Dim ja As New JArray
Dim jo As New JObject
Dim ss As String = "C:\\MyFolder1\\" & dr1("活动id") & "\\" & dr1("案件id") & "\\" & Values(3)
SS = SS.Replace("\\", "/")
jo("url") = ss
jo("name") = Values(3)
ja.Add(jo)
Output.show(ja.ToString)
End If
Else
End If
End If
Next
Next

--  作者：有点蓝
--  发布时间：2023/11/14 20:11:00
--
既然循环多了，那就去掉一个循环啊，第2个for循环的目的是什么？