[SOLVED] How does Entity Framework Extended batch Update method deal with default values?

How does Entity Framework Extended batch Update method deal with default values?

I'm using Entity Framework Extended to perform a batch update just like the example below from its official documentation (https://github.com/loresoft/EntityFramework.Extended/wiki/Batch-Update-and-Delete):

//update all tasks with status of 1 to status of 2
context.Tasks
.Where(t => t.StatusId == 1)
.Update(t => new Task { StatusId = 2 });

It works, but I'd like to know the inner workings. How does it deal with the default values of the Task object. Let's say it has a property called MyProperty which is an int that defaults to 0. When a Task object is initialized, it's MyProperty value will have the default value of 0. How does Entity Framework Extended distinguish between MyProperty having the default value of 0, or if I'm trying to set MyProperty of all matched objects to their default value of 0, e.g. new Task { StatusId = 2 , MyProperty = 0} as the created Task object will be exactly the same in each case?

Solution

When you pass this:

.Update(t => new Task { StatusId = 2 });

You are not creating a Task object at all. You are passing in an expression which the batch updater is parsing (and not executing at all). The new Task { StatusId = 2 } is never executed.