Entity Framework Extensions Ignore OnUpdateMatched AndOneNotCondition Expression

Description

The IgnoreOnUpdateMatchedAndOneNotConditionExpression is the inverse of MergeMatchedAndNotConditionExpression

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

The following example updates all those records in which the ModifiedDate property is not equal to a database value. It ignores the specified properties in IgnoreOnUpdateMatchedAndOneNotConditionExpression 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.IsActive = false; });
    customers.Take(2).ToList().ForEach(x => { x.ModifiedDate = DateTime.Now; });

    context.BulkUpdate(customers, options => 
    {
        options.IgnoreOnUpdateMatchedAndOneNotConditionExpression = c => new 
        {
            c.Name, 
            c.Description, 
            c.CreatedDate, 
            c.IsActive 
        };
    });
}

Try it: EF Core | EF6

• It will update all the records except for the last record.
• The ModifiedDate property is only updated for the first two records and not for the last record.