DataViewRowState Enum
Definition
Important
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Describes the version of data in a DataRow.
This enumeration supports a bitwise combination of its member values.
public enum class DataViewRowState
[System.Flags]
public enum DataViewRowState
[<System.Flags>]
type DataViewRowState =
Public Enum DataViewRowState
- Inheritance
- Attributes
Fields
Added | 4 | A new row. |
CurrentRows | 22 | Current rows including unchanged, new, and modified rows. By default, DataViewRowState is set to CurrentRows. |
Deleted | 8 | A deleted row. |
ModifiedCurrent | 16 | A current version of original data that has been modified (see |
ModifiedOriginal | 32 | The original version of the data that was modified. (Although the data has since been modified, it is available as |
None | 0 | None. |
OriginalRows | 42 | Original rows including unchanged and deleted rows. |
Unchanged | 2 | An unchanged row. |
Examples
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.
static private void DemonstrateRowState()
{
// Create a DataTable with one column.
DataTable dataTable = new DataTable("dataTable");
DataColumn dataColumn = new DataColumn("dataColumn");
dataTable.Columns.Add(dataColumn);
// Add ten rows.
DataRow dataRow;
for (int i = 0; i < 10; i++)
{
dataRow = dataTable.NewRow();
dataRow["dataColumn"] = "item " + i;
dataTable.Rows.Add(dataRow);
}
dataTable.AcceptChanges();
// Create a DataView with the table.
DataView dataView = 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
| 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");
}
static private void PrintView(DataView dataView, string label)
{
Console.WriteLine("\n" + label);
for (int i = 0; i < dataView.Count; i++)
{
Console.WriteLine(dataView[i]["dataColumn"]);
}
}
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
Remarks
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.
The DataTable uses DataViewRowState in the Select method.