DbApplyChangeFailedEventArgs.Conflict 属性

获取一个 DbSyncConflict 对象，其中包含要应用的行以及数据库中导致失败的现有行的数据和元数据。

命名空间: Microsoft.Synchronization.Data
程序集: Microsoft.Synchronization.Data（在 microsoft.synchronization.data.dll 中）

语法

声明
Public ReadOnly Property Conflict As DbSyncConflict
用法
Dim instance As DbApplyChangeFailedEventArgs
Dim value As DbSyncConflict

value = instance.Conflict

public DbSyncConflict Conflict { get; }

public:
property DbSyncConflict^ Conflict {
    DbSyncConflict^ get ();
}

/** @property */
public DbSyncConflict get_Conflict ()

public function get Conflict () : DbSyncConflict

属性值

一个包含冲突数据和元数据的 DbSyncConflict 对象。

备注

如果在同步期间无法应用某行，则会引发 ApplyChangeFailed 事件。DbApplyChangeFailedEventArgs 对象提供有关导致失败的错误或冲突的信息。在事件处理程序中，可以用多种方式来响应事件，包括指定同步提供程序是否应该重新尝试应用该行。有关更多信息，请参见如何处理协作同步中的数据冲突和错误 (SQL Server)。

如果应用程序在同步期间必须更改数据值，则使用 DbSyncContext 对象（可通过 Context 属性获得），而不使用 DbSyncConflict 对象。DbSyncConflict 对象包含每个对等方的行的副本。在同步过程中，对于这些副本的变更在每个对等方不会持久保留。

示例

下面的代码示例说明如何在 ApplyChangeFailed 事件处理程序中处理“更新-更新”冲突。在本例中，冲突行显示在控制台中，同时有一个选项指定哪一行应在冲突中入选。若要在完整示例上下文中查看此代码，请参见如何处理协作同步中的数据冲突和错误 (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

请参阅

参考

DbApplyChangeFailedEventArgs 类
DbApplyChangeFailedEventArgs 成员
Microsoft.Synchronization.Data 命名空间