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如何判斷DataContext有修改：

EF6的

using (var db = new Model1()) {if (db.ChangeTracker.HasChanges()){Console.WriteLine("Something has changed");} }

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EF5中：

public bool HasUnsavedChanges(){return this.ChangeTracker.Entries().Any(e => e.State == EntityState.Added|| e.State == EntityState.Modified|| e.State == EntityState.Deleted);}

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EF4中為：

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public Boolean HasUnsavedChanges(){return (this.ObjectContext().ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Modified | EntityState.Deleted).Any());}

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DataContext如何放棄修改的建議：

this is not supposed way to use context. Context is unit of work - do changes you really want to do and then save them. If you find that you don't want to save changes dispose the context and create a new one. The best practice is using context for one single logical operation. Sharing context or using static context is a bad practice and because of that there is no build in method to "reset" context - you must do it yourselves by exploring ObjectStateManager and reverting all changes (it can be quite complex task).

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參考

Entity Framework 5 - DbContext Has Changes

Entity Framework 6.1 is context dirty

轉載于:https://www.cnblogs.com/HQFZ/p/4159100.html

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