DbApplyChangeFailedEventArgs 类

为 ApplyChangeFailed 事件提供数据。

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

语法

声明
<SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase")> _
Public Class DbApplyChangeFailedEventArgs
    Inherits EventArgs
用法
Dim instance As DbApplyChangeFailedEventArgs

[SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase")] 
public class DbApplyChangeFailedEventArgs : EventArgs

[SuppressMessageAttribute(L"Microsoft.Naming", L"CA1706:ShortAcronymsShouldBeUppercase")] 
public ref class DbApplyChangeFailedEventArgs : public EventArgs

/** @attribute SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase") */ 
public class DbApplyChangeFailedEventArgs extends EventArgs

SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase") 
public class DbApplyChangeFailedEventArgs extends EventArgs

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)。

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

继承层次结构

System.Object
   System.EventArgs
    Microsoft.Synchronization.Data.DbApplyChangeFailedEventArgs

线程安全

此类型的所有公共静态（在 Visual Basic 中共享 ）成员都是线程安全的。不保证任何实例成员的线程安全。

请参阅

参考

DbApplyChangeFailedEventArgs 成员
Microsoft.Synchronization.Data 命名空间