Événement ApplyChangeFailed
Se produit pendant le téléchargement ascendant, après l'échec d'application d'une ligne au niveau d'un nœud.
Espace de noms : Microsoft.Synchronization.Data
Assembly : Microsoft.Synchronization.Data (dans Microsoft.Synchronization.Data.dll)
Syntaxe
'Déclaration
Public Event ApplyChangeFailed As EventHandler(Of DbApplyChangeFailedEventArgs)
'Utilisation
Dim instance As RelationalSyncProvider
Dim handler As EventHandler(Of DbApplyChangeFailedEventArgs)
AddHandler instance.ApplyChangeFailed, handler
public event EventHandler<DbApplyChangeFailedEventArgs> ApplyChangeFailed
public:
event EventHandler<DbApplyChangeFailedEventArgs^>^ ApplyChangeFailed {
void add (EventHandler<DbApplyChangeFailedEventArgs^>^ value);
void remove (EventHandler<DbApplyChangeFailedEventArgs^>^ value);
}
member ApplyChangeFailed : IEvent<EventHandler<DbApplyChangeFailedEventArgs>,
DbApplyChangeFailedEventArgs>
Notes
S'il est impossible d'appliquer une ligne durant la synchronisation, l'événement ApplyChangeFailed est déclenché. L'objet DbApplyChangeFailedEventArgs fournit des informations sur l'erreur ou le conflit à l'origine de l'échec. Dans un gestionnaire pour l'événement, vous pouvez répondre à l'événement de différentes façons, notamment en indiquant si le fournisseur de synchronisation doit essayer d'appliquer à nouveau la ligne. Pour plus d'informations, consultez Procédure : gérer les conflits de données et les erreurs pour la synchronisation de bases de données (SQL Server).
Exemples
Les exemples de code suivants montrent comment les conflits de mise à jour-mise à jour peuvent être traités dans un gestionnaire d'événements ApplyChangeFailed. Dans l'exemple, les lignes en conflit sont affichées sur la console avec une option pour spécifier la ligne doit gagner le conflit. Pour afficher ce code dans le contexte d'un exemple complet, consultez Procédure : gérer les conflits de données et les erreurs pour la synchronisation de bases de données (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