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DbApplyChangeFailedEventArgs.Conflict Property

Gets a DbSyncConflict object that contains data and metadata for the row being applied and for the existing row in the database that caused the failure.

Namespace:  Microsoft.Synchronization.Data
Assembly:  Microsoft.Synchronization.Data (in Microsoft.Synchronization.Data.dll)

public DbSyncConflict Conflict { get; }

Property Value

Type: Microsoft.Synchronization.Data.DbSyncConflict
A DbSyncConflict object that contains conflict data and metadata.

If a row cannot be applied during synchronization, the ApplyChangeFailed event is raised. The DbApplyChangeFailedEventArgs object provides information about the error or conflict that caused the failure. In a handler for the event, you can respond to the event in several ways, including specifying whether the synchronization provider should try to apply the row again. For more information, see How to: Handle Data Conflicts and Errors for Database Synchronization (SQL Server).

If an application must change data values during synchronization, use the DbSyncContext object that is available through the Context property, instead of the DbSyncConflict object. The DbSyncConflict object contains copies of the rows at each peer. Changes to these copies are not persisted at each peer during synchronization.

The following code examples show how update-update conflicts can be processed in an ApplyChangeFailed event handler. In the example, the conflicting rows are displayed to the console with an option to specify which row should win the conflict. To view this code in the context of a complete example, see How to: Handle Data Conflicts and Errors for Database Synchronization (SQL Server).

localProvider.ApplyChangeFailed += new EventHandler<DbApplyChangeFailedEventArgs>(dbProvider_ApplyChangeFailed);
remoteProvider.ApplyChangeFailed += new EventHandler<DbApplyChangeFailedEventArgs>(dbProvider_ApplyChangeFailed);


if (e.Conflict.Type == DbConflictType.LocalUpdateRemoteUpdate)
{

    //Get the conflicting changes from the Conflict object
    //and display them. The Conflict object holds a copy
    //of the changes; updates to this object will not be 
    //applied. To make changes, use the Context object.
    DataTable conflictingRemoteChange = e.Conflict.RemoteChange;
    DataTable conflictingLocalChange = e.Conflict.LocalChange;
    int remoteColumnCount = conflictingRemoteChange.Columns.Count;
    int localColumnCount = conflictingLocalChange.Columns.Count;

    Console.WriteLine(String.Empty);
    Console.WriteLine(String.Empty);
    Console.WriteLine("Row from database " + DbConflictDetected);
    Console.Write(" | ");

    //Display the local row. As mentioned above, this is the row
    //from the database at which the conflict was detected.
    for (int i = 0; i < localColumnCount; i++)
    {
        Console.Write(conflictingLocalChange.Rows[0][i] + " | ");
    }

    Console.WriteLine(String.Empty);
    Console.WriteLine(String.Empty);
    Console.WriteLine(String.Empty);
    Console.WriteLine("Row from database " + DbOther);
    Console.Write(" | ");

    //Display the remote row.
    for (int i = 0; i < remoteColumnCount; i++)
    {
        Console.Write(conflictingRemoteChange.Rows[0][i] + " | ");
    }

    //Ask for a conflict resolution option.
    Console.WriteLine(String.Empty);
    Console.WriteLine(String.Empty);
    Console.WriteLine("Enter a resolution option for this conflict:");
    Console.WriteLine("A = change from " + DbConflictDetected + " wins.");
    Console.WriteLine("B = change from " + DbOther + " wins.");

    string conflictResolution = Console.ReadLine();
    conflictResolution.ToUpper();

    if (conflictResolution == "A")
    {
        e.Action = ApplyAction.Continue;
    }

    else if (conflictResolution == "B")
    {
        e.Action = ApplyAction.RetryWithForceWrite;
    }

    else
    {
        Console.WriteLine(String.Empty);
        Console.WriteLine("Not a valid resolution option.");
    }
}


AddHandler localProvider.ApplyChangeFailed, AddressOf dbProvider_ApplyChangeFailed
AddHandler remoteProvider.ApplyChangeFailed, AddressOf dbProvider_ApplyChangeFailed


If e.Conflict.Type = DbConflictType.LocalUpdateRemoteUpdate Then

    'Get the conflicting changes from the Conflict object
    'and display them. The Conflict object holds a copy
    'of the changes; updates to this object will not be 
    'applied. To make changes, use the Context object.
    Dim conflictingRemoteChange As DataTable = e.Conflict.RemoteChange
    Dim conflictingLocalChange As DataTable = e.Conflict.LocalChange
    Dim remoteColumnCount As Integer = conflictingRemoteChange.Columns.Count
    Dim localColumnCount As Integer = conflictingLocalChange.Columns.Count

    Console.WriteLine(String.Empty)
    Console.WriteLine(String.Empty)
    Console.WriteLine("Row from database " & DbConflictDetected)
    Console.Write(" | ")

    'Display the local row. As mentioned above, this is the row
    'from the database at which the conflict was detected.
    Dim i As Integer
    For i = 0 To localColumnCount - 1
        Console.Write(conflictingLocalChange.Rows(0)(i).ToString & " | ")
    Next i

    Console.WriteLine(String.Empty)
    Console.WriteLine(String.Empty)
    Console.WriteLine(String.Empty)
    Console.WriteLine("Row from database " & DbOther)
    Console.Write(" | ")

    'Display the remote row.
    For i = 0 To remoteColumnCount - 1
        Console.Write(conflictingRemoteChange.Rows(0)(i).ToString & " | ")
    Next i

    'Ask for a conflict resolution option.
    Console.WriteLine(String.Empty)
    Console.WriteLine(String.Empty)
    Console.WriteLine("Enter a resolution option for this conflict:")
    Console.WriteLine("A = change from " & DbConflictDetected & " wins.")
    Console.WriteLine("B = change from " & DbOther & " wins.")

    Dim conflictResolution As String = Console.ReadLine()
    conflictResolution.ToUpper()

    If conflictResolution = "A" Then
        e.Action = ApplyAction.Continue

    ElseIf conflictResolution = "B" Then
        e.Action = ApplyAction.RetryWithForceWrite

    Else
        Console.WriteLine(String.Empty)
        Console.WriteLine("Not a valid resolution option.")
    End If


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