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我有以下代码，我试图通过 ReportViewer 以编程方式创建 xml 报告。

Dim outputPath As String = "C:\backup\test.xml"
Dim reportViewer As New ReportViewer()
Dim serverReport As ServerReport = reportViewer.ServerReport()

reportViewer.ServerReport.ReportPath = "/<path>/<report>"
reportViewer.ServerReport.ReportServerUrl = New Uri("http://<ip>/reportserver")
reportViewer.ProcessingMode = ProcessingMode.Local

reportViewer.ServerReport.ReportServerCredentials.NetworkCredentials = New System.Net.NetworkCredential("<user>", "<pwd>")

Dim parameters As New List(Of ReportParameter)

parameters.Add(New ReportParameter("LocationLocationParent", "[Location].[Location Parent].&[2]"))
parameters.Add(New ReportParameter("CalendarYear", "[Calendar].[Year].&[2014-01-01T00:00:00]"))
parameters.Add(New ReportParameter("StaffStaffName", "[Staff].[Staff Name].&[Bob Smith]"))

Try
    serverReport.SetParameters(parameters)

    Dim mimeType As String = ""
    Dim encoding As String = ""
    Dim extension As String = ""
    Dim streams As String() = Nothing
    Dim warnings As Warning() = Nothing

    Dim xmlBytes As Byte() = serverReport.Render("XML", String.Empty, mimeType, encoding, extension, streams, warnings)

    Using fs As FileStream = New FileStream(outputPath, FileMode.Create)
        fs.Write(xmlBytes, 0, xmlBytes.Length)
        fs.Close()
    End Using

Catch reportEx As ReportServerException
    Debug.Print(reportEx.Message)
End Try

在我为 LocationLocationParent 设置参数的地方，它不允许我按名称设置值，只能通过列表中每个值具有的某种类型的索引。SSRS 报告本身的下拉列表采用树状结构，如下所示：

Parent1
    Parent2
        Parent4
            Child1
            Child2
        Parent5
            Child3
            Child4
        Child5
    Parent3
        Child5
        Child6

这个列表不是一棵真正的树，只是看起来像一棵树。它是复选框项目的多选列表。例如，我无法将参数设置为值“Child3” - 仅通过其索引，但报告窗口的列表中有 100 个值。如果我这样设置：“[Location].[Location Parent].&[Child3]”我得到以下异常

此报告需要报告参数“LocationLocationParent”的默认值或用户定义值。要运行或订阅此报告，您必须提供参数值。(rsReportParameterValueNotSet)

请注意，StaffStaffName 参数不是以树状结构形成的，只是一个列表，因此我能够正确设置该参数。

如何为 LocationLocationParent 设置我想要的值的名称？

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