Entity Framework Extensions MergeMatched AndCondition Expression

The MergeMatchedAndConditionExpression allows you to perform only the UPDATE in the BulkMerge if the specified property value is equal to the database value.

The following example updates all those records in which CreatedDate value is equal to the database value.

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.MergeMatchedAndConditionExpression = c => new {c.CustomerID, c.CreatedDate };
    });
}

Try it online

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