DataRowVersion Enum

Reference

Definition

Namespace:: System.Data

Assembly:: System.Data.Common.dll

Assembly:: System.Data.dll

Assembly:: netstandard.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Describes the version of a DataRow.

public enum class DataRowVersion

public enum DataRowVersion

type DataRowVersion =

Public Enum DataRowVersion

Inheritance: Object

ValueType

Enum
DataRowVersion

Fields

Name	Value	Description
Original	256	The row contains its original values.
Current	512	The row contains current values.
Proposed	1024	The row contains a proposed value.
Default	1536	The default version of DataRowState. For a `DataRowState` value of `Added`, `Modified` or `Deleted`, the default version is `Current`. For a DataRowState value of `Detached`, the version is `Proposed`.

Examples

The following example checks the DataRowVersion of a DataRow before invoking the AcceptChanges method.

private static void CheckVersionBeforeAccept()
{
    //Run a function to create a DataTable with one column.
    DataTable dataTable = MakeTable();

    DataRow dataRow = dataTable.NewRow();
    dataRow["FirstName"] = "Marcy";
    dataTable.Rows.Add(dataRow);

    dataRow.BeginEdit();
    // Edit data but keep the same value.
    dataRow[0] = "Marcy";
    // Uncomment the following line to add a new value.
    // dataRow(0) = "Richard"
    Console.WriteLine(string.Format("FirstName {0}", dataRow[0]));

    // Compare the proposed version with the current.
    if (dataRow.HasVersion(DataRowVersion.Proposed)) {
        if (object.ReferenceEquals(dataRow[0, DataRowVersion.Current], dataRow[0, DataRowVersion.Proposed])) {
            Console.WriteLine("The original and the proposed are the same.");
            dataRow.CancelEdit();
        } else {
            dataRow.AcceptChanges();
            Console.WriteLine("The original and the proposed are different.");
        }
    }
}

private static DataTable MakeTable()
{
    // Make a simple table with one column.
    DataTable dt = new DataTable("dataTable");
    DataColumn firstName = new DataColumn("FirstName", Type.GetType("System.String"));
    dt.Columns.Add(firstName);
    return dt;
}

Private Sub CheckVersionBeforeAccept()
    'Run a function to create a DataTable with one column.
    Dim dataTable As DataTable = MakeTable()

    Dim dataRow As DataRow = dataTable.NewRow()
    dataRow("FirstName") = "Marcy"
    dataTable.Rows.Add(dataRow)

    dataRow.BeginEdit()
    ' Edit data but keep the same value.
    dataRow(0) = "Marcy"
    ' Uncomment the following line to add a new value.
    ' dataRow(0) = "Richard"
    Console.WriteLine(String.Format("FirstName {0}", dataRow(0)))

    ' Compare the proposed version with the current.
    If dataRow.HasVersion(DataRowVersion.Proposed) Then
        If dataRow(0, DataRowVersion.Current) Is dataRow(0, DataRowVersion.Proposed) Then
            Console.WriteLine("The original and the proposed are the same.")
            dataRow.CancelEdit()
        Else
            dataRow.AcceptChanges()
            Console.WriteLine("The original and the proposed are different.")
        End If
    End If
End Sub

Private Function MakeTable() As DataTable
    ' Make a simple table with one column.
    Dim dt As New DataTable("dataTable")
    Dim firstName As New DataColumn("FirstName", _
       Type.GetType("System.String"))
    dt.Columns.Add(firstName)
    Return dt
End Function

Remarks

The DataRowVersion values are used when retrieving the value found in a DataRow using Item[] or the GetChildRows of the DataRow object.

The DataRowVersion informs you what version of a DataRow exists. Versions change under the following circumstances:

After calling the DataRow object's BeginEdit method, if you change the value, the Current and Proposed values become available.
After calling the DataRow object's CancelEdit method, the Proposed value is deleted.
After calling the DataRow object's EndEdit method, the Proposed value becomes the Current value.
After calling the DataRow object's AcceptChanges method, the Original value becomes identical to the Current value.
After calling the DataTable object's AcceptChanges method, the Original value becomes identical to the Current value.
After calling the DataRow object's RejectChanges method, the Proposed value is discarded, and the version becomes Current.

Applies to

Deila með