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Exam : Microsoft 70-551VB
Title : Upgrade: MCAD Skills to MCPD Dvlpr by Using the MS.NET Frmwk


1. You create a class library that contains the class hierarchy defined in the following code segment. (Line numbers are included for reference only.)
01 Public Class Group
02 Public Employees As Employee()
03 End Class
04
05 Public Class Employee
06 Public Name As String
07 End Class
08
09 Public Class Manager
10 Inherits Employee
11 Public Level As Integer
12 End Class
You create an instance of the Group class. You populate the fields of the instance. When you attempt to serialize the instance by using the Serialize method of the XmlSerializer class, you receive InvalidOperationException. You also receive the following error message: "There was an error generating the XML document." You need to modify the code segment so that you can successfully serialize instances of the Group class by using the XmlSerializer class. You also need to ensure that the XML output contains an element for all public fields in the class hierarchy. What should you do?
A. Insert the following code between lines 1 and 2 of the code segment: <XmlArrayItem(Type:=GetType(Employee))> _ <XmlArrayItem(Type:=GetType(Manager))> _
B. Insert the following code between lines 1 and 2 of the code segment: <XmlElement(Type:=GetType(Employee))> _
C. Insert the following code between lines 1 and 2 of the code segment: <XmlArray(ElementName:="Employees")> _
D. Insert the following code between lines 5 and 6 of the code segment: <XmlElement(Type:=GetType(Employee))> andInsert the following code between lines 10 and 11 of the code segment: <XmlElement(Type:=GetType(Manager))>
Answer: A

2. You create an application for your business partners to submit purchase orders. The application deserializes XML documents sent by your partners into instances of an object named PurchaseOrder. You need to modify the application so that it collects details if the deserialization process encounters any XML content that fails to map to public members of the PurchaseOrder object. What should you do?
A. Define and implement an event handler for the XmlSerializer.UnknownNode event.
B. Define a class that inherits from XmlSerializer and overrides the XmlSerialize.FromMappings method.
C. Apply an XmlInclude attribute to the PurchaseOrder class definition.
D. Apply an XmlIgnore attribute to the PurchaseOrder class definition.
Answer: A

3. You are writing a method to compress an array of bytes. The array is passed to the method in a parameter named document. You need to compress the incoming array of bytes and return the result as an array of bytes. Which code segment should you use?
A. Dim objStream As New MemoryStream(document)Dim objDeflate As New DeflateStream(objStream, CompressionMode.Compress)Dim result(document.Length) As ByteobjDeflate.Write(result, 0, result.Length)Return result
B. Dim objStream As New MemoryStream(document)Dim objDeflate As New DeflateStream(objStream, CompressionMode.Compress)objDeflate.Write(document, 0, document.Length)objDeflate.Close()Return objStream.ToArray
C. Dim objStream As New MemoryStream()Dim objDeflate As New DeflateStream(objStream, CompressionMode.Compress)objDeflate.Write(document, 0, document.Length)objDeflate.Close()Return objStream.ToArray
D. Dim objStream As New MemoryStream()Dim objDeflate As New DeflateStream(objStream, CompressionMode.Compress)Dim outStream As New MemoryStreamDim b As IntegerWhile (b = objDeflate.ReadByte) outStream.WriteByte(CByte(b))End WhileReturn outStream.ToArray
Answer: C

4. You are writing a method to compress an array of bytes. The bytes to be compressed are passed to the method in a parameter named document. You need to compress the contents of the incoming parameter. Which code segment should you use?
A. Dim inStream As New MemoryStream(document)Dim zipStream As New GZipStream( _inStream, CompressionMode.Compress)Dim result(document.Length) As BytezipStream.Write(result, 0, result.Length)Return result
B. Dim objStream As New MemoryStream(document)Dim zipStream As New GZipStream( _ objStream, CompressionMode.Compress)zipStream.Write(document, 0, document.Length)zipStream.Close()Return objStream.ToArray
C. Dim outStream As New MemoryStreamDim zipStream As New GZipStream( _outStream, CompressionMode.Compress)zipStream.Write(document, 0, document.Length)zipStream.Close()Return outStream.ToArray
D. Dim objStream As New MemoryStream(document)Dim zipStream As New GZipStream( _objStream, CompressionMode.Compress)Dim outStream As New MemoryStreamDim b As IntegerWhile (b = zipStream.ReadByte)outStream.WriteByte(CByte(b))End WhileReturn outStream.ToArray
Answer: C

5. You are creating a class that performs complex financial calculations. The class contains a method named GetCurrentRate that retrieves the current interest rate and a variable named currRate that stores the current interest rate. You write serialized representations of the class. You need to write a code segment that updates the currRate variable with the current interest rate when an instance of the class is deserialized. Which code segment should you use?
A. <OnSerializing> _Friend Sub UpdateValue (ByVal context As StreamingContext) currRate = GetCurrentRate()End Sub
B. <OnSerializing> _ Friend Sub UpdateValue(ByVal info As SerializationInfo) info.AddValue("currentRate", GetCurrentRate())End Sub
C. <OnDeserializing> _ Friend Sub UpdateValue(ByVal info As SerializationInfo) info.AddValue("currentRate", GetCurrentRate())End Sub
D. <OnDeserialized> _Friend Sub UpdateValue (ByVal context As StreamingContext) currRate = GetCurrentRate()End Sub
Answer: D

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