Entity Framework Extensions Ignore OnMergeMatched AndCondition Expression

Description

The IgnoreOnMergeMatchedAndConditionExpression is the inverse of MergeMatchedAndConditionExpression.

• The MergeMatchedAndConditionExpression allows you to perform only the UPDATE in the BulkMerge if the specified property value is equal to the database value.
• So by default, all columns are included in IgnoreOnMergeMatchedAndConditionExpression 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 ignores the specified properties in IgnoreOnMergeMatchedAndConditionExpression 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.BulkMerge(customers, options => 
    {
        options.IgnoreOnMergeMatchedAndConditionExpression = c => new 
        {
            c.Name, 
            c.Description, 
            c.ModifiedDate, 
            c.IsActive 
        };
    });
}

Try it: EF Core | EF6

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