单项选择题
You are implementing an ASP.NET application. You add the following code segment.
You need to add code to return a list of all Person objects except those with a UserId that is contained in the secretUsers list. The resulting list must not contain duplicates. Which code segment should you use？（）
A.var secretPeople = （from p in allPeople from u in secretUsers where p.UserId == u select p）.Distinct（）； return allPeople.Except（secretPeople）；
B.return from p in allPeople from u in secretUsers where p.UserId != u select p；
C.return （from p in allPeople from u in secretUsers where p.UserId != u select p）.Distinct（）；
D.List
相关考题
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单项选择题
You are implementing an ASP.NET application that uses LINQ to Entities to access and update the database.The application includes the following method to update a detached entity of type Person. You need to implement the UpdatePerson method to update the database row that corresponds to the personToEdit object. Which code segment should you use？（）
A._entities.People.Attach（personToEdit）； _entities.ObjectStateManager.ChangeObjectState（personToEdit， EntityState.Modified）； _entities.SaveChanges（）；
B._entities.ObjectStateManager.ChangeObjectState（personToEdit， EntityState.Added）；_entities.SaveChanges（）；
C._entities.People.ApplyCurrentValues（personToEdit）； _entities.SaveChanges（）；
D._entities.People.Attach（new Person（） { Id = personToEdit.Id }）；_entities.ObjectStateManager.ChangeObjectState（personToEdit， EntityState.Modified）；_entities.SaveChanges（）； -
单项选择题
You are implementing an ASP.NET page. Client-side script requires data. Your application includes a class named Person with a Name property of type string. The code-behind file of the page includes the following code segment. You need to use the JavaScriptSerializer class to serialize only the Name property of each item in the people list. Which code segment should you use？（）
A.JsonValue = json.Serialize（people.Select（p => p.Name））；
B.var names = from person in people select person； JsonValue = "{" + json.Serialize（names） + "}"；
C.JsonValue = json.Serialize（people.SelectMany（ p =>Name.AsEnumerable（）））；
D.var names = from person in people select person； JsonValue = json.Serialize（names）； -
单项选择题
You are implementing an ASP.NET page. You add and configure the following ObjectDataSource. The page will be called with a query string field named pid. You need to configure the ObjectDataSource control to pass the value of the pid field to GetProductsByProductId method. What should you do? （）
A.Replace the asp：QueryStringParameter with the following declaration.
B.Replace the asp：QueryStringParameter with the following declaration.
C.Add the following event handler to the Selecting event of the ObjectDataSource control.
D.Add the following code segment to the page’s code-behind.
