DataRowView.RowVersion-Eigenschaft
Ruft die aktuelle Versionsbeschreibung der DataRow ab.
Namespace: System.Data
Assembly: System.Data (in system.data.dll)
Syntax
'Declaration
Public ReadOnly Property RowVersion As DataRowVersion
'Usage
Dim instance As DataRowView
Dim value As DataRowVersion
value = instance.RowVersion
public DataRowVersion RowVersion { get; }
public:
property DataRowVersion RowVersion {
DataRowVersion get ();
}
/** @property */
public DataRowVersion get_RowVersion ()
public function get RowVersion () : DataRowVersion
Eigenschaftenwert
Einer der DataRowVersion-Werte. Mögliche Werte für die RowVersion-Eigenschaft sind Default, Original, Current und Proposed.
Hinweise
Mit der RowStateFilter-Eigenschaft wird sowohl die DataRowState-Einstellung als auch DataRowVersion-Einstellung angegeben. Weitere Informationen finden Sie unter DataRowState, DataRowVersion und DataViewRowState.
Beispiel
Im folgenden Beispiel wird mithilfe der RowVersion-Eigenschaft der Zustand einer Zeile in der DataRowView bestimmt.
Private Sub DemonstrateRowVersion()
Dim i As Integer
' Create a DataTable with one column.
Dim table As New DataTable("Table")
Dim column As New DataColumn("Column")
table.Columns.Add(column)
' Add ten rows.
Dim row As DataRow
For i = 0 To 9
row = table.NewRow()
row("Column") = "item " + i.ToString()
table.Rows.Add(row)
Next i
table.AcceptChanges()
' Create a DataView with the table.
Dim view As New DataView(table)
' Change one row's value:
table.Rows(1)("Column") = "Hello"
' Add one row:
row = table.NewRow()
row("Column") = "World"
table.Rows.Add(row)
' Set the RowStateFilter to display only added and modified rows.
view.RowStateFilter = _
DataViewRowState.Added Or DataViewRowState.ModifiedCurrent
' Print those rows. Output includes "Hello" and "World".
PrintView(view, "ModifiedCurrent and Added")
' Set filter to display only originals of modified rows.
view.RowStateFilter = DataViewRowState.ModifiedOriginal
PrintView(view, "ModifiedOriginal")
' Delete three rows.
table.Rows(1).Delete()
table.Rows(2).Delete()
table.Rows(3).Delete()
' Set the RowStateFilter to display only deleted rows.
view.RowStateFilter = DataViewRowState.Deleted
PrintView(view, "Deleted")
' Set filter to display only current rows.
view.RowStateFilter = DataViewRowState.CurrentRows
PrintView(view, "Current")
' Set filter to display only unchanged rows.
view.RowStateFilter = DataViewRowState.Unchanged
PrintView(view, "Unchanged")
' Set filter to display only original rows.
' Current values of unmodified rows are also returned.
view.RowStateFilter = DataViewRowState.OriginalRows
PrintView(view, "OriginalRows")
End Sub
Private Sub PrintView(ByVal view As DataView, ByVal label As String)
Console.WriteLine(ControlChars.Cr + label)
Dim i As Integer
For i = 0 To view.Count - 1
Console.WriteLine(view(i)("Column"))
Console.WriteLine("DataRowView.RowVersion: {0}", _
view(i).RowVersion)
Next i
End Sub
private static void DemonstrateRowVersion()
{
// Create a DataTable with one column.
DataTable table = new DataTable("Table");
DataColumn column = new DataColumn("Column");
table.Columns.Add(column);
// Add ten rows.
DataRow row;
for (int i = 0; i < 10; i++)
{
row = table.NewRow();
row["Column"] = "item " + i;
table.Rows.Add(row);
}
table.AcceptChanges();
// Create a DataView with the table.
DataView view = new DataView(table);
// Change one row's value:
table.Rows[1]["Column"] = "Hello";
// Add one row:
row = table.NewRow();
row["Column"] = "World";
table.Rows.Add(row);
// Set the RowStateFilter to display only added
// and modified rows.
view.RowStateFilter = DataViewRowState.Added |
DataViewRowState.ModifiedCurrent;
// Print those rows. Output includes "Hello" and "World".
PrintView(view, "ModifiedCurrent and Added");
// Set filter to display only originals of modified rows.
view.RowStateFilter = DataViewRowState.ModifiedOriginal;
PrintView(view, "ModifiedOriginal");
// Delete three rows.
table.Rows[1].Delete();
table.Rows[2].Delete();
table.Rows[3].Delete();
// Set the RowStateFilter to display only deleted rows.
view.RowStateFilter = DataViewRowState.Deleted;
PrintView(view, "Deleted");
// Set filter to display only current rows.
view.RowStateFilter = DataViewRowState.CurrentRows;
PrintView(view, "Current");
// Set filter to display only unchanged rows.
view.RowStateFilter = DataViewRowState.Unchanged;
PrintView(view, "Unchanged");
// Set filter to display only original rows.
// Current values of unmodified rows are also returned.
view.RowStateFilter = DataViewRowState.OriginalRows;
PrintView(view, "OriginalRows");
}
private static void PrintView(DataView view, string label)
{
Console.WriteLine("\n" + label);
for (int i = 0; i < view.Count; i++)
{
Console.WriteLine(view[i]["Column"]);
Console.WriteLine("DataViewRow.RowVersion: {0}",
view[i].RowVersion);
}
}
Plattformen
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
.NET Compact Framework
Unterstützt in: 2.0, 1.0
Siehe auch
Referenz
DataRowView-Klasse
DataRowView-Member
System.Data-Namespace
AcceptChanges
BeginEdit
DataRowVersion-Enumeration
EndEdit