Exam 70-483 topic 2 question 147 discussion

Actual exam question from Microsoft's 70-483

Question #: 147
Topic #: 2

You are troubleshooting an application that uses a class named FullName. The class is decorated with the DataContractAttribute attribute. The application includes the following code. Line numbers are included for reference only.

You need to ensure that the entire FullName object is serialized to the memory stream object.
Which code segment should you insert at line 09?

A. binary.WriteEndElement();
B. binary.WriteEndDocument();
C. binary.WriteEndElementAsync();
D. binary.Flush();

Show Suggested Answer

Suggested Answer: B 🗳️
✑ DataContractSerializer.WriteEndObject Method (XmlDictionaryWriter)
Writes the closing XML element using an XmlDictionaryWriter.
✑ Note on line 07: DataContractSerializer.WriteObject Method
Writes all the object data (starting XML element, content, and closing element) to an XML document or stream.
XmlDictionaryWriter

by Bio at July 4, 2019, 12:58 p.m.

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Bio

Highly Voted 5 years, 10 months ago

D: https://docs.microsoft.com/en-us/dotnet/framework/wcf/samples/datacontractserializer-sample

upvoted 28 times

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sscooter1010

Highly Voted 5 years, 3 months ago

// code static MemoryStream WriteName(Name name) { var ms = new MemoryStream(); var binary = XmlDictionaryWriter.CreateBinaryWriter(ms); var ser = new DataContractSerializer(typeof(Name)); ser.WriteObject(binary, name); binary.WriteEndDocument(); Console.WriteLine("After binary.WritenEndDocument: Binary stream is {0} bytes long", ms.Length); binary.Flush(); Console.WriteLine("After binary.Flush(), Binary stream is {0} bytes long", ms.Length); return ms; } // output // After binary.WritenEndDocument: Binary stream is 0 bytes long // After binary.Flush(), Binary stream is 131 bytes long

upvoted 7 times

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nichlas

Most Recent 4 years, 4 months ago

This really confuses me.. Everytime this question shows up the "correct answer" is "WriteEndDocument" but all the users in the discussion says it must be "flush"

upvoted 2 times

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noussa

4 years, 4 months ago

D is the correct answer

upvoted 3 times

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xman

5 years, 2 months ago

Answer: B Explanation Example: MemoryStream stream2 = new MemoryStream(); XmlDictionaryWriter binaryDictionaryWriter = XmlDictionaryWriter.CreateBinaryWriter(stream2); serializer.WriteObject(binaryDictionaryWriter, record1); binaryDictionaryWriter.Flush(); Incorrect: Not A: throws InvalidOperationException. Reference: https://msdn.microsoft.com/en-us/library/ms752244(v=vs.110).aspx

upvoted 2 times

xman

5 years, 2 months ago

Sorry D not B

upvoted 9 times

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