You are developing an application that uses the Microsoft ADO.NET Entity Framework to retrieve
order information from a Microsoft SQL Server database. The application includes the following
code. (Line numbers are included for reference only.)
The application must meet the following requirements:
Return only orders that have an OrderDate value other than null.
Return only orders that were placed in the year specified in the OrderDate property or in a later
year.
You need to ensure that the application meets the requirements.
Which code segment should you insert at line 08?
A.
Where order.OrderDate.Value != null && order.OrderDate.Value.Year > = year
B.
Where order.OrderDate.Value = = null && order.OrderDate.Value.Year = = year
C.
Where order.OrderDate.HasValue && order.OrderDate.Value.Year = = year
D.
Where order.OrderDate.Value.Year = = year
Explanation:
*For the requirement to use an OrderDate value other than null use:
OrderDate.Value != null
*For the requirement to use an OrderDate value for this year or a later year use:
OrderDate.Value>= year
At run time if orderdate is null all the code throw exception.
The only option which not throw any exception is:
Where order.OrderDate.HasValue && order.OrderDate.Value.Year = = year
but the second condition would be order.OrderDate.Value.Year >= year
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C, they forgot a >= at the end. This is the only one with a “has value”. Accessing DateTime?.Value even if it is null throws an “invalid operations exception”.
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there is no correct answer
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It must be C … OrderDate is set to be Nullable (DateTime?) which will cause exception when using OrderDate.Value if OrderDate is Null.
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