RelationalSyncProvider.ApplyChangeFailed Event
Occurs during uploading, after failing to apply a row at a node.
Assembly: Microsoft.Synchronization.Data (in Microsoft.Synchronization.Data.dll)
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).
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).
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."); } }
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. For i As Integer = 0 To localColumnCount - 1 Console.Write(conflictingLocalChange.Rows(0)(i).ToString() & " | ") Next 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 As Integer = 0 To remoteColumnCount - 1 Console.Write(conflictingRemoteChange.Rows(0)(i).ToString() & " | ") Next '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