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POEF DataContext selecting unsaved objects
 

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    <p>I am trying to implement an UnitOfWork type pattern where one DataContext is used over a short group of related methods and only at the end do I save the changes. However, I have found that entities added to the ObjectContext do seem to be available for reselection unless I SaveChanges, which is what I am trying to avoid. Can someone tell me if this is the expected behaviour? I have provided a psuedo test to illustrate:</p> <pre><code> [Test] public void ObjectContext_ShouldSelectBackUncommitedValuesWhenUsingTheSameContext() { //arrange var entityConnectionString = "MyEntityConnectionString"; var dataContext = new MyObjectContext(entityConnectionString); var personCount = dataContext.People.AsQueryable&lt;Person&gt;().Count(); var person = new Person() { Name = "Bob" }; //act dataContext.AddToPeople(person); //assert var actualPerson = dataContext.People.AsQueryable&lt;Person&gt;().Where(p =&gt; p.Name == "Bob").FirstOrDefault(); Assert.IsTrue(actualPerson != null,"Uncommitted Person should return when using same context"); var actualCount = dataContext.People.AsQueryable&lt;Person&gt;().Count(); Assert.IsTrue(actualCount == personCount + 1, String.Format("Expected {0} people but got {1} people", personCount + 1, actualCount)); //leave transaction to rollback } </code></pre> <p>This test fails with the actualPerson being null and the Count of the People set not incrementing. Forgive me if there are any typos as I have just simplified my own ObjectContext.</p> <p>FYI I am using EF 4.</p> <p>TIA.</p> <p>--EDIT-- Further by way of analogy, I was hoping to be able to work with uncommitted objects as I can in SQL eg:</p> <pre><code>CREATE TABLE Person (Name nvarchar(10)); INSERT INTO Person VALUES ('Francois') INSERT INTO Person VALUES ('Hans') SELECT COUNT(*) FROM Person BEGIN TRANSACTION INSERT INTO Person VALUES ('Bob') SELECT 'Bob Lives!' WHERE EXISTS(SELECT * FROM Person WHERE NAME='Bob') ROLLBACK TRANSACTION DROP TABLE Person </code></pre>
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