Entity Framework Extensions Ignore OnMergeUpdate Expression

Description

The IgnoreOnMergeUpdateExpression allows you to ignore some columns when the BulkMerge method executes the update statement, and these columns will only be used in the insert statement.

The following example ignores the Name and IsActive properties while updating the records and will be considered during insertion.

using (var context = new EntityContext())
{
    var list = context.Customers.ToList();
    list.ForEach(x => 
    { 
        x.IsActive = false; 
	x.Name += "_NotMerge"; 
	x.Description += "_Merge"; 
	x.IsActive = false; 
    });
			
    context.BulkMerge(list, options => 
    {
        options.IgnoreOnMergeUpdateExpression = customer => new 
	{
	    customer.CustomerID, 
	    customer.IsActive, 
	    customer.Name
	};
    });
}

Try it: EF Core | EF6

Last updated: 2025-06-24
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