Vb.net 如何使用联接表创建RDLC报告？

我正在尝试创建一个报告，该报告将显示我的表，该表包含来自不同表的连接，看起来像这样

select * from tblproduct As p inner join tblbrand As b On p.bid = b.brandid inner Join tblclassification As c On p.cid = c.classid inner Join tblformulation As f On p.fid = f.formid inner Join tblgeneric As g On p.gid = g.genericid inner Join tbltype As t On p.tid = t.typeid

我的表由8列组成，其中4列是用于联接的列id。当我尝试显示到datagridview时，我可以成功地使用该查询，但当我在reportviewer中尝试此操作时，它不起作用，并给出错误：

“对象引用未发送到对象实例”

。这就是我试过的

Public Class frmInventoryReport

    Public Property strReport2 As String
    Private Sub frmInventoryReport_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        Me.tblproductTableAdapter.Fill(Me.groceryDataSet.tblproduct)
        Me.ReportViewer1.RefreshReport()

        Dim rptDataSource As New ReportDataSource

        Try
            With Me.ReportViewer1.LocalReport
                .ReportPath = "D:\VisualBasic\EELPOS - Copy\EELPOS\Report3.rdlc"
                .DataSources.Clear()
            End With

            Select Case strReport2
                Case "Report3"

                    Dim i As Integer = 0
                    Dim sqlQuery As String = "select * from tblproduct As p inner join tblbrand As b On p.bid = b.brandid inner Join tblclassification As c On p.cid = c.classid inner Join tblformulation As f On p.fid = f.formid inner Join tblgeneric As g On p.gid = g.genericid inner Join tbltype As t On p.tid = t.typeid"
                    Dim da As New MySqlDataAdapter(sqlQuery, cn)
                    Dim dt As DataTable = New DataTable()
                    While dr.Read
                        dt.Rows.Add(i, dr.Item("barcode").ToString, dr.Item("generic").ToString, dr.Item("classification").ToString, dr.Item("type").ToString, dr.Item("formulation").ToString, dr.Item("price").ToString, dr.Item("qty").ToString)
                    End While
                    da.Fill(dt)

                    rptDataSource = New ReportDataSource("inventory", dt)

            End Select

            Me.ReportViewer1.LocalReport.DataSources.Add(rptDataSource)

        Catch ex As Exception
            MessageBox.Show(ex.Message, My.Application.Info.Title, MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try

        Me.ReportViewer1.RefreshReport()

    End Sub
End Class

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正确的方法是什么？

您应该做的一个更正是显式命名字段。避免在生产代码中选择*。另一件事是编辑您的帖子以识别引发异常的行。除了使用Select*（坏习惯）之外，您能提供更多详细信息吗？您需要检查输出窗口以了解更详细的错误。甚至不清楚这是一份报告给了你一个错误。