调用的目标发生了异常。 - 专家坐堂 - 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!

Dim e As RequestEventArgs = args(0)

Dim wb As New weui

Dim sb As New StringBuilder

Dim jo As JObject = JObject.Parse(e.PlainText) '解析JSON数据

Dim cmd As New SQLCommand

Dim dt As DataTable

Dim dt1 As DataTable

cmd.C

Dim openid As String = jo("openid").ToString

cmd.CommandText = " sel ect * from 员工点餐表 where openid = '" & openid & "' and 点餐日期>='" & Date.Today.AddDays( - 3) & "' order by 点餐日期 desc,时间 desc "

dt1 = cmd.ExecuteReader()

Dim txt As String

With wb.AddPanelGroup("page5", "page5pg1", "点餐清单")

If dt1.DataRows.Count > 0 Then

For Each dr5 As DataRow In dt1.DataRows

txt = "菜品:" & dr5("菜品") & " 数量:" & dr5("数量") & " 单价:" & dr5("单价") & " 金额:" & dr5("数量") * dr5("单价")

.Add(dr5("单据内码"), dr5("用餐日期") & dr5("时间") , txt, dr5("图片"), "") '超链接

Next ''

End If

End With

With wb.AddButtonGroup("page5", "page5btngrp1", False)

.Add("page5btn1", "返回", "").Attribute = """

End With

txt = wb.BuildHTML("page5pg1")

txt = txt & wb.BuildHTML("page5btngrp1")

e.WriteString(txt)

以上是源代码

下边是错误提示

.NET Framework 版本：4.0.30319.42000

Foxtable 版本：2022.8.18.1

错误所在事件：自定义函数,ydqdcx

详细错误信息：

调用的目标发生了异常。

值不能为 null。

参数名: s

这个是什么原因？

主题：调用的目标发生了异常。