DataViewRowState Enumeration
Describes the version of data in a DataRow.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Namespace: System.DataAssembly: System.Data (in System.Data.dll)
| Member name | Description | |
|---|---|---|
![]() ![]() | None | None. |
![]() ![]() | Unchanged | An unchanged row. |
![]() ![]() | Added | A new row. |
![]() ![]() | Deleted | A deleted row. |
![]() ![]() | ModifiedCurrent | A current version of original data that has been modified (see ModifiedOriginal). |
![]() ![]() | ModifiedOriginal | The original version of the data that was modified. (Although the data has since been modified, it is available as ModifiedCurrent). |
![]() ![]() | OriginalRows | Original rows including unchanged and deleted rows. |
![]() ![]() | CurrentRows | Current rows including unchanged, new, and modified rows. |
The DataViewRowState values are used either to retrieve a particular version of data from a DataRow, or to determine what versions exist.
Set the RowStateFilter property of the DataView to specify which version or versions of data you want to view.
You can use the Boolean operator Or with the values to get more than one version.
In the following example DataTable is created with a single column. The data is changed, and the RowStateFilter of the DataView is set to display different row sets, depending on the DataViewRowState.
Private Sub DemonstrateRowState() Dim i As Integer ' Create a DataTable with one column. Dim dataTable As New DataTable("dataTable") Dim dataColumn As New DataColumn("dataColumn") dataTable.Columns.Add(dataColumn) ' Add ten rows. Dim dataRow As DataRow For i = 0 To 9 dataRow = dataTable.NewRow() dataRow("dataColumn") = "item " + i.ToString() dataTable.Rows.Add(dataRow) Next i dataTable.AcceptChanges() ' Create a DataView with the table. Dim dataView As New DataView(dataTable) ' Change one row's value: dataTable.Rows(1)("dataColumn") = "Hello" ' Add one row: dataRow = dataTable.NewRow() dataRow("dataColumn") = "World" dataTable.Rows.Add(dataRow) ' Set the RowStateFilter to display only Added and modified rows. dataView.RowStateFilter = _ DataViewRowState.Added Or DataViewRowState.ModifiedCurrent ' Print those rows. Output = "Hello" "World"; PrintView(dataView, "ModifiedCurrent and Added") ' Set filter to display on originals of modified rows. dataView.RowStateFilter = DataViewRowState.ModifiedOriginal PrintView(dataView, "ModifiedOriginal") ' Delete three rows. dataTable.Rows(1).Delete() dataTable.Rows(2).Delete() dataTable.Rows(3).Delete() ' Set the RowStateFilter to display only Added and modified rows. dataView.RowStateFilter = DataViewRowState.Deleted PrintView(dataView, "Deleted") 'Set filter to display only current. dataView.RowStateFilter = DataViewRowState.CurrentRows PrintView(dataView, "Current") ' Set filter to display only unchanged rows. dataView.RowStateFilter = DataViewRowState.Unchanged PrintView(dataView, "Unchanged") ' Set filter to display only original rows. dataView.RowStateFilter = DataViewRowState.OriginalRows PrintView(dataView, "OriginalRows") End Sub Private Sub PrintView(ByVal dataView As DataView, ByVal label As String) Console.WriteLine(ControlChars.Cr + label) Dim i As Integer For i = 0 To dataView.Count - 1 Console.WriteLine(dataView(i)("dataColumn")) Next i End Sub
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The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
