Entity Framework Extensions Ignore OnSynchronizeMatched AndCondition Expression

The IgnoreOnSynchronizeMatchedAndConditionExpression is the inverse of SynchronizeMatchedAndConditionExpression.

• The SynchronizeMatchedAndConditionExpression allows you to perform the bulk synchronize operation if the specified property value is not equal to the database value.
• So by default, all columns are included in IgnoreOnSynchronizeMatchedAndConditionExpression but not the one you choose to ignore.

The following example updates all those records in which the CreatedDate property is equal to database value and ignore the specified properties in IgnoreOnUpdateMatchedAndConditionExpression if their value is equal to the database or not.

using (var context = new EntityContext())
{
    var customers = context.Customers.ToList();
    customers.ForEach(x => 
    { 
        x.Name += "_Updated"; 
        x.Description += "_Updated"; 
        x.ModifiedDate = DateTime.Now; 
        x.IsActive = false; 
    });
    customers.Last().CreatedDate = DateTime.Now;

    context.BulkSynchronize(customers, options => 
    {
        options.IgnoreOnSynchronizeMatchedAndConditionExpression = c => new 
        {
            c.Name, 
            c.Description, 
            c.ModifiedDate, 
            c.IsActive 
        };
    });
}

Try it online

• It will update all the records except for the last record because the CreatedDate property is updated for the last record.