ChangeConflicts Property

In This Topic

Returns a collection of objects that caused concurrency conflicts when SubmitChanges was called.

Syntax

Visual Basic
C#

'Declaration
 
Public ReadOnly Property ChangeConflicts As ChangeConflictCollection

public ChangeConflictCollection ChangeConflicts {get;}

Property Value

A collection of objects that caused concurrency conflicts when SubmitChanges was called.

Remarks

Can be used only if the SubmitChanges(ConflictMode) with ContinueOnConflict as the failureMode was called.

Example

The following example shows how the collection can be iterated over to retrieve conflict information.

Optimistic Concurrency: Overview

csharp

Northwnd db = new Northwnd("...");

try
{
    db.SubmitChanges(ConflictMode.ContinueOnConflict);
}

catch (ChangeConflictException e)
{
    Console.WriteLine("Optimistic concurrency error.");
    Console.WriteLine(e.Message);
    foreach (ObjectChangeConflict occ in db.ChangeConflicts)
    {
MetaTable metatable = db.Mapping.GetTable(occ.Object.GetType());
Customer entityInConflict = (Customer)occ.Object;
        Console.WriteLine("Table name: {0}", metatable.TableName);
        Console.Write("Customer ID: ");
        Console.WriteLine(entityInConflict.CustomerID);
        Console.ReadLine();
    }
}

Visual Basic

Dim db As New Northwnd("...")

Try
    db.SubmitChanges(ConflictMode.ContinueOnConflict)

Catch ex As ChangeConflictException
    Console.WriteLine("Optimistic concurrency error.")
    Console.WriteLine(ex.Message)
For Each occ As ObjectChangeConflict In db.ChangeConflicts
Dim metatable As MetaTable = db.Mapping.GetTable(occ.Object.GetType())
Dim entityInConflict = occ.Object

        Console.WriteLine("Table name: " & metatable.TableName)
        Console.Write("Customer ID: ")
        Console.WriteLine(entityInConflict.CustomerID)
        Console.ReadLine()
    Next
End Try

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

DataContext Class
DataContext Members

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