MemberChangeConflict Class

Reference

Definition

Namespace:: System.Data.Linq

Assembly:: System.Data.Linq.dll

Important

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Represents a situation in which an attempted update fails because member values have been updated since the client last read them.

public ref class MemberChangeConflict sealed

public sealed class MemberChangeConflict

type MemberChangeConflict = class

Public NotInheritable Class MemberChangeConflict

Inheritance: Object
MemberChangeConflict

Examples

// 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();
        }
    }
}

' 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

Remarks

The following example shows how to retrieve information about members in conflict.

Properties

CurrentValue	Gets the current value of the member in conflict.
DatabaseValue	Gets the database value of the member in conflict.
IsModified	Gets a value that indicates whether the member data has been changed since the last database read or refresh.
IsResolved	Gets a value that indicates whether the conflict has been resolved.
Member	Gets metadata information about the member in conflict.
OriginalValue	Gets the original value of the member in conflict.

Methods

Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
Resolve(Object)	Specifies the value to set as the current value for the member in conflict.
Resolve(RefreshMode)	Uses a RefreshMode parameter to automatically specify the value to set as the current value for the member in conflict.
ToString()	Returns a string that represents the current object. (Inherited from Object)

Applies to