FIX: MSHFLexGrid Does Not Display More Than 2048 Rows

Symptoms

The Hierarchical FlexGrid control always displays a maximum of 2048 rows regardless of the number of records in the data source.

Resolution

Although the record-count of the mshflexgrid is correct, only the first 2048 records are displayed. If you need to display more than 2048, you need to open the recordset and populate the grid using the GetString method of ADO and the Clip property of the MSHFlexGrid.


The code below can be used in place of the code in the Command1_Click event in the MORE INFORMATION section to work around this behavior:

   Dim cn As New ADODB.Connection
Dim rs As New ADODB.Recordset
Dim rsVar As Variant
Dim i As Integer
cn.Open "Testing" '<-- Your DSN

rs.Open "select * from Cies", cn, adOpenStatic, adLockOptimistic
rs.MoveLast

rs.MoveFirst
' Assuming that rs is your ADO recordset
MSHFlexGrid1.Rows = rs.RecordCount + 1

rsVar = rs.GetString(adClipString, rs.RecordCount)

MSHFlexGrid1.Cols = rs.Fields.Count

' Set column names in the grid
For i = 0 To rs.Fields.Count - 1

MSHFlexGrid1.TextMatrix(0, i) = rs.Fields(i).Name

Next

MSHFlexGrid1.Row = 1
MSHFlexGrid1.Col = 0

' Set range of cells in the grid
MSHFlexGrid1.RowSel = MSHFlexGrid1.Rows - 1
MSHFlexGrid1.ColSel = MSHFlexGrid1.Cols - 1
MSHFlexGrid1.Clip = rsVar

' Reset the grid's selected range of cells
MSHFlexGrid1.RowSel = MSHFlexGrid1.Row
MSHFlexGrid1.ColSel = MSHFlexGrid1.Col

rs.Close
Set rs = Nothing
cn.Close
Set cn = Nothing

Status

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3.

For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base:

194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

More Information

This behavior of the MSHFlexGrid can be demonstrated against various back- ends including SQL Server, Access, etc.

Steps to Reproduce Behavior

Test Table

  1. Create a simple table with the following fields:

    Name Data Type (SQL Server) Data Type(Access)
    ------------------------------------------------------------------

    PartID Integer Integer
    PartName VarChar (10) Text (10)
  2. Insert about 3000 - 10000 rows in your table. For simplicity, you can create a loop and insert the same record in a counter of 3000 to 10000.
  3. Save your table as "Test."

    NOTE: You can choose any other back-end to perform the test.

Visual Basic Client

  1. Start a new Standard EXE project in Visual Basic. Form1 is created by default.
  2. Select "Components" on the Project menu, and choose the following components:
    • Microsoft ADO Data Control 6.0 (OLE DB).
    • Microsoft Hierarchical FlexGrid Control 6.0.

  3. Select References on the Project menu, and click "Microsoft ActiveX Data Objects 2.0 Library."
  4. Place the following objects on the form:

    Control Name Caption
    -------------------------------------------------------------------

    CommandButton Command1 Using ADO Recordset
    CommandButton Command2 Using ADODC
    CommandButton Command3 Free MSHFlexGrid
    MSHFlexGrid MSHFlexGrid1 Testing MSHFlexGrid Display
    ADODC Adodc1
  5. Bind ADODC via your DSN or via your native OLEDB provider (if it exists). In the RecordSource property, write: Select * From Test.
  6. Place the following code in the General Declaration section of Form1:
           Option Explicit

    Private Sub Command1_Click()

    Dim cn As New ADODB.Connection
    Dim rs As New ADODB.Recordset

    cn.Open "Testing" '<-- Your DSN

    rs.Open "select * from Test", cn, adOpenStatic, adLockOptimistic
    rs.MoveLast

    ' Check the number records in your ADO recordset
    ' The RecordCount property of the ADO recordset reflects the
    ' actual number of records

    Debug.Print "ADO recordset record-count: " & vbTab & _
    rs.RecordCount

    Form1.Caption = "Loading grid... please wait..."

    Set MSHFlexGrid1.Recordset = rs

    ' Check the number of rows that the Hierarchical FlexGrid
    ' contains The RecordCount property of the Hierarchical
    ' FlexGrid also reflects the actual number of records

    Debug.Print "MSHFlexGrid1 Recordset record-count: " & vbTab & _
    MSHFlexGrid1.Recordset.RecordCount

    Form1.Caption = "MSHFlexGrid Display Sample"

    ' Free resources
    rs.Close
    Set rs = Nothing
    cn.Close
    Set cn = Nothing

    End Sub

    Private Sub Command2_Click()

    Form1.Caption = "Loading data... please wait..."

    ' Set the Grid's source to be ADODC
    Set MSHFlexGrid1.DataSource = Adodc1

    ' Check the number of records in ADODC recordset
    Debug.Print "ADO data control record-count: " & vbTab & _
    Adodc1.Recordset.RecordCount
    Form1.Caption = "MSHFlexGrid Display Sample"
    End Sub

    Private Sub Command3_Click()
    MSHFlexGrid1.Clear
    Form1.Caption = "Grid is clear now..."
    End Sub
  7. Press the F5 key to run the code, and note that only 2048 records are displayed in the MSHFlexGrid.

    NOTE: Connecting to the data source using the OLEDB Provider for ODBC or using the native OLEDB Provider has no effect on the Hierarchical FlexGrid behavior.
Propiedades

Id. de artículo: 194653 - Última revisión: 06/22/2014 - Revisión: 1

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