[Free] 2018(June) Dumps4cert Microsoft 77-884 Dumps with VCE and PDF Download 181-190

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Programming in C#

Question No: 181 – (Topic 2)

You are developing a class named Account that will be used by several applications.

The applications that will consume the Account class will make asynchronous calls to the Account class to execute several different methods.

You need to ensure that only one call to the methods is executed at a time.

Which keyword should you use?

  1. sealed

  2. protected

  3. checked

  4. lock

Answer: D

Question No: 182 – (Topic 2)

You are implementing a method named ProcessReports that performs a long-running task. The ProcessReports() method has the following method signature:

public void ProcessReports(Listlt;decimalgt; values,CancellationTokenSource cts, CancellationToken ct)

If the calling code requests cancellation, the method must perform the following actions:

-> Cancel the long-running task.

-> Set the task status to TaskStatus.Canceled.

You need to ensure that the ProcessReports() method performs the required actions. Which code segment should you use in the method body?

  1. if (ct.IsCancellationRequested) return;

  2. ct.ThrowIfCancellationRequested() ;

  3. cts.Cancel();

  4. throw new AggregateException();

Answer: B

Question No: 183 – (Topic 2)

You are developing an assembly.

You plan to sign the assembly when the assembly is developed. You need to reserve space in the assembly for the signature.

What should you do?

  1. Run the Assembly Linker tool from the Windows Software Development Kit (Windows SDK).

  2. Run the Strong Name tool from the Windows Software Development Kit (Windows SDK).

  3. Add the AssemblySignatureKeyAttribute attribute the assembly.

  4. Add the AssemblyDelaySignAttribute attribute to the assembly.

Answer: D

Question No: 184 – (Topic 2)

An application contains code that measures reaction times. The code runs the timer on a thread separate from the user interface. The application includes the following code. (Line numbers are included for reference only.)

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You need to ensure that the application cancels the timer when the user presses the Enter key.

Which code segment should you insert at line 14?

  1. tokenSource.Token.Register( () =gt; tokenSource.Cancel() );

  2. tokenSource.Cancel();

  3. tokenSource.IsCancellationRequested = true;

  4. tokenSource.Dispose();

Answer: B

Question No: 185 – (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.)

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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?

  1. binary.WriteEndDocument();

  2. binary.WriteEndDocumentAsync();

  3. binary.WriteEndElementAsync();

  4. binary.Flush();

Answer: A

Explanation: * 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

    Question No: 186 – (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.)

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    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?

    1. binary.WriteEndElement();

    2. binary.NriteEndDocument();

    3. ms.Close() ;

    4. binary.Flush();

    Answer: A

    Explanation: * 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

    Question No: 187 – (Topic 2)

    You are creating an application that processes a list of numbers.

    The application must define a method that queries the list and displays a subset of the numbers to the user. The method must not update the list.

    You need to create an extendable query by using LINQ. What should you do?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: C

    Question No: 188 – (Topic 2)

    You are creating a class library that will be used in a web application. You need to ensure that the class library assembly is strongly named. What should you do?

    1. Use the csc.exe /target:Library option when building the application.

    2. Use the AL.exe command-line tool.

    3. Use the aspnet_regiis.exe command-line tool.

    4. Use the EdmGen.exe command-line tool.

    Answer: B

    Explanation: The Windows Software Development Kit (SDK) provides several ways to sign an assembly with a strong name:

  • Using the Assembly Linker (Al.exe) provided by the Windows SDK.

  • Using assembly attributes to insert the strong name information in your code. You can use either the AssemblyKeyFileAttribute or the AssemblyKeyNameAttribute, depending on where the key file to be used is located.

  • Using compiler options such /keyfile or /delaysign in C# and Visual Basic, or the

    /KEYFILE or /DELAYSIGN linker option in C . (For information on delay signing, see Delay Signing an Assembly.)

    Note:

  • A strong name consists of the assembly#39;s identity-it’s simple text name, version number, and culture information (if provided)-plus a public key and a digital signature. It is generated from an assembly file (the file that contains the assembly manifest, which in turn contains the names and hashes of all the files that make up the assembly), using the corresponding private key. Microsoft庐 Visual Studio庐 .NET and other development tools provided in the .NET Framework SDK can assign strong names to an assembly.

Assemblies with the same strong name are expected to be identical.

Question No: 189 DRAG DROP – (Topic 2)

You have a class named Customer and a class named Order.

The customer class has a property named Orders that contains a list of Order objects. The Order class has a property named OrderDate that contains the date of the Order.

You need to create a LINQ query that returns all of the customers who had at least one order during the year 2005.

You write the following code.

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How should you complete the code? To answer, drag the appropriate code elements to the correct targets in the answer area. Each code element may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

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Answer:

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Explanation: Target 1 : Where Target 2 : Join Target 3 : =gt; Target 4 : ==

Question No: 190 – (Topic 2)

You develop an application by using C#. The application counts the number of times a specific word appears within a set of text files. The application includes the following code. (Line numbers are included for reference only.)

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You have the following requirements:

-> Populate the _wordCounts object with a list of words and the number of occurrences of each word.

-> Ensure that updates to the ConcurrentDictionary object can happen in parallel.

You need to complete the relevant code.

Which code segment should you insert at line 23?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: A

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