Dim para1 As New Oracle.DataAccess.Client.OracleParameter
            Dim para2 As New Oracle.DataAccess.Client.OracleParameter
            Dim rdr As Oracle.DataAccess.Client.OracleDataReader

            With cmd
                .Parameters.Clear()
                .Parameters.Add("procDate", Oracle.DataAccess.Client.OracleDbType.Varchar2) _
                .Value = procDate
                .Parameters.Add("objCur", Oracle.DataAccess.Client.OracleDbType.RefCursor) _
                .Direction = ParameterDirection.Output
            End With

           Dim ds As DataSet = New DataSet
            Dim oraDa As Oracle.DataAccess.Client.OracleDataAdapter = _ 
            New Oracle.DataAccess.Client.OracleDataAdapter(cmd)
            Dim dt As DataTable
            oraDa.Fill(ds)

            dt = ds.Tables(0)
            Dim dtList As New ArrayList
            If Not dt Is Nothing AndAlso dt.Rows.Count > 0 Then
                Dim iCount As Integer
                For iCount = 0 To dt.Rows.Count - 1
                    dtList.Add(CStr(dt.Rows(iCount).Item(0)) & " " & CStr(dt.Rows(iCount).Item(1)))
                Next
            End If
            Return dtList
        Catch ex As Exception
            MsgBox(ex.ToString)
        End Try

    End Function 


需要注意的是，用到的CONNECTION和COMMAND对象的声明，现在用的是
Dim conn As New Oracle.DataAccess.Client.OracleConnection
Dim cmd As New Oracle.DataAccess.Client.OracleCommand

项目中一直用的是：
Dim cmd As IDbCommand = Nothing
Dim con As IDbConnection 
这样给存储过程传入的参数中，没有RefCursor类型，最后还是搞定了，呵呵。
可惜领导认为这样和其他的功能在DB访问上不太一样，最后还是没有使用，
不管怎样算是了解了一点VB.NET中调用存储过程的方法。