How to: Retrieve Member Conflict Information (LINQ to SQL)
You can use the MemberChangeConflict class to retrieve information about individual members in conflict. In this same context you can provide for custom handling of the conflict for any member. For more information, see Optimistic Concurrency Overview (LINQ to SQL).
Example
The following code iterates through the ObjectChangeConflict objects. For each object, it then iterates through the MemberChangeConflict objects.
Note
Include System.Reflection in order to provide Member information.
' Add 'Imports System.Reflection' for this section.
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 As Object = occ.Object
Console.WriteLine("Table name: " & metatable.TableName)
Console.Write("Customer ID: ")
Console.WriteLine(entityInConflict.CustomerID)
For Each mcc As MemberChangeConflict In occ.MemberConflicts
Dim currVal = mcc.CurrentValue
Dim origVal = mcc.OriginalValue
Dim databaseVal = mcc.DatabaseValue
Dim mi As MemberInfo = mcc.Member
Console.WriteLine("Member: " & mi.Name)
Console.WriteLine("current value: " & currVal)
Console.WriteLine("original value: " & origVal)
Console.WriteLine("database value: " & databaseVal)
Console.ReadLine()
Next
Next
End Try
// Add 'using System.Reflection' for this section.
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);
foreach (MemberChangeConflict mcc in occ.MemberConflicts)
{
object currVal = mcc.CurrentValue;
object origVal = mcc.OriginalValue;
object databaseVal = mcc.DatabaseValue;
MemberInfo mi = mcc.Member;
Console.WriteLine("Member: {0}", mi.Name);
Console.WriteLine("current value: {0}", currVal);
Console.WriteLine("original value: {0}", origVal);
Console.WriteLine("database value: {0}", databaseVal);
Console.ReadLine();
}
}
}