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PONotifying Entity Framework context about changes at later time rather then at object's properties change
 

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    <p>I have simple <code>ObjectListView</code> which displays some columns from <code>EntityFramework</code> of objects called <code>Person</code> (to simplify things). I load it with Entity Framework to <code>ObjectListview</code>and then <code>deatch</code> it from Context. The person has multiple fields (like Name, Surname, File, ...). </p> <p>Considering that some files are 5mb-50mb I don't want to load/save them to database without need. Now when someone double clicks in <code>ObjectListView</code> the selected <code>Person</code> is loaded into TextBox fields. When editing any of the fields I check if <code>Person</code> Name or SurName changed and if it did I updated the context like in the code below.</p> <pre><code> private void test (Person person){ using (var context = new EntityBazaCRM(Settings.sqlDataConnectionDetailsCRM)) { context.Persons.Attach(dokument); if (person.Name != nameTextBox.Text) { person.Name = nameTextBox.Text; context.ObjectStateManager.GetObjectStateEntry(person).SetModifiedProperty("Name"); } if (person.SurName != surNameTextBox.Text) { person.SurName = surNameTextBox.Text; context.ObjectStateManager.GetObjectStateEntry(person).SetModifiedProperty("SurName"); } context.SaveChanges(); } } </code></pre> <p>This works.. but what I would like to do is actually not save the changes straight away after users changes it but in the end when he presses BIG button <code>SAVE ALL</code> so then it would go thru all ObjectListView items and update them as needed in database. The problem is I can't update context and do it later since the Context wouldn't be used then but in the end when saving everything. </p> <p>So what are my options? I was pointed to use <a href="https://stackoverflow.com/questions/9104553/how-to-find-out-if-an-entity-framework-object-has-changed">INotifyPropertyChanged</a> but as much as I looked at the code I don't think it's good for this type of situation or I simply don't know how to use it.</p> <p>The other option was to actually create bool value per each <code>Column</code> from the database like</p> <pre><code>public partial class Person { public bool NameChanged {get;set; } public bool SurnameChanged { get; set; } } </code></pre> <p>And when saving I would be checking if bool changed and if yes do the ObjectStateManager magic on the context prior to save. </p> <p>Any other way to do this? </p>
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