DbConflictType 列舉型別

定義在同步處理期間可能發生的衝突類型。

命名空間: Microsoft.Synchronization.Data
組件: Microsoft.Synchronization.Data (在 microsoft.synchronization.data.dll)

語法

'宣告
<SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase")> _
Public Enumeration DbConflictType
'用途
Dim instance As DbConflictType

[SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase")] 
public enum DbConflictType

[SuppressMessageAttribute(L"Microsoft.Naming", L"CA1706:ShortAcronymsShouldBeUppercase")] 
public enum class DbConflictType

/** @attribute SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase") */ 
public enum DbConflictType

SuppressMessageAttribute("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase") 
public enum DbConflictType

成員

	成員名稱	描述
	ErrorsOccurred	對等 (Peer) 資料庫在套用變更時擲回了例外狀況 (Exception)。
	LocalCleanedupDeleteRemoteUpdate	本機對等刪除了遠端對等所更新的資料列，而且已清除該資料列的中繼資料。
	LocalDeleteRemoteDelete	本機和遠端對等都刪除了相同的資料列。
	LocalDeleteRemoteUpdate	本機對等刪除了遠端對等更新的資料列。
	LocalInsertRemoteInsert	本機和遠端對等都插入了具有相同主索引鍵值的資料列，這會產生主索引鍵違規。
	LocalUpdateRemoteDelete	本機對等更新了遠端對等刪除的資料列。
	LocalUpdateRemoteUpdate	本機和遠端對等都更新了相同的資料列。

備註

在 Sync Framework 中，系統會在資料列層級偵測到衝突和錯誤。如果在同步處理之間有一個以上的節點中變更資料列，就會產生衝突。同步處理期間發生的錯誤基本上與條件約束違規有關，例如重複的主索引鍵。如需詳細資訊，請參閱 HOW TO：處理共同作業同步處理的資料衝突和錯誤 (SQL Server)。

範例

下列程式碼範例會示範如何在 ApplyChangeFailed 事件處理常式中處理更新與更新衝突。在範例中，衝突的資料列是顯示在主控台上，並有選項可指定衝突中哪個資料列應該優先處理。若要在完整範例的內容中檢視這段程式碼，請參閱 HOW TO：處理共同作業同步處理的資料衝突和錯誤 (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

請參閱

參考

Microsoft.Synchronization.Data 命名空間