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70-483 Exam

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Q111. DRAG DROP - (Topic 1)

You are implementing a method that creates an instance of a class named User. The User class contains a public event named Renamed. The following code segment defines the Renamed event:

Public event EventHandler<RenameEventArgs> Renamed;

You need to create an event handler for the Renamed event by using a lambda expression.

How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment 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.)

Answer:

Q112. - (Topic 2)

You are implementing a new method named ProcessData. The ProcessData() method calls a third-party component that performs a long-running operation.

The third-party component uses the IAsyncResult pattern to signal completion of the long-running operation.

You need to ensure that the calling code handles the long-running operation as a System.Threading.Tasks.Task object.

Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A. Call the component by using the TaskFactory.FromAsync() method.

B. Create a TaskCompletionSource<T> object.

C. Apply the async modifier to the method signature.

D. Apply the following attribute to the method signature: [MethodImpl(MethodImplOptions.Synchronized)]

Answer: A,B

Explanation: A: TaskFactory.FromAsync Method

Creates a Task that represents a pair of begin and end methods that conform to the

Asynchronous Programming Model pattern. Overloaded.

Example:

TaskFactory.FromAsync Method (IAsyncResult, Action<IAsyncResult>)

Creates a Task that executes an end method action when a specified IAsyncResult

completes.

B: In many scenarios, it is useful to enable a Task<TResult> to represent an external asynchronous operation. TaskCompletionSource<TResult> is provided for this purpose. It enables the creation of a task that can be handed out to consumers, and those consumers can use the members of the task as they would any other. However, unlike most tasks, the state of a task created by a TaskCompletionSource is controlled explicitly by the methods on TaskCompletionSource. This enables the completion of the external asynchronous operation to be propagated to the underlying Task. The separation also ensures that consumers are not able to transition the state without access to the corresponding TaskCompletionSource.

Note:

* System.Threading.Tasks.Task Represents an asynchronous operation.

Q113. - (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?

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

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

C. Add the AssemblySignatureKeyAttribute attribute the assembly.

D. Add the AssemblyDelaySignAttribute attribute to the assembly.

Answer: D

Q114. DRAG DROP - (Topic 2)

An application serializes and deserializes XML from streams. The XML streams are in the following format:

The application reads the XML streams by using a DataContractSerializer object that is declared by the following code segment:

You need to ensure that the application preserves the element ordering as provided in the XML stream.

You have the following code:

Which attributes should you include in Target 1, Target 2 and Target 3 to complete the code? (To answer, drag the appropriate attributes to the correct targets in the answer area. Each attribute 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.)

Answer:

Q115. - (Topic 1)

You are adding a public method named UpdateGrade to a public class named ReportCard.

The code region that updates the grade field must meet the following requirements: . It must be accessed by only one thread at a time. . It must not be vulnerable to a deadlock situation. You need to implement the UpdateGrade() method.

What should you do?

A. Option A

B. Option B

C. Option C

D. Option D

Answer: A

Q116. - (Topic 2)

You are creating a console application named App1.

App1 will validate user input for order entries.

You are developing the following code segment (line numbers are included for reference only):

You need to complete the code segment.

The solution must ensure that prices are positive and have two decimal places.

Which code should you insert at line 03?

A. Option A

B. Option B

C. Option C

D. Option D

Answer: B

Explanation: * Regex.IsMatch Method (String, String)

Indicates whether the specified regular expression finds a match in the specified input string.

Syntax:

public static bool IsMatch(

string input,

string pattern

)

Q117. - (Topic 2)

You are creating a console application named Appl.

App1 retrieves data from the Internet by using JavaScript Object Notation (JSON).

You are developing the following code segment (line numbers are included for reference only):

You need to ensure that the code validates the JSON string. Which code should you insert at line 03?

A. Option A

B. Option B

C. Option C

D. Option D

Answer: B

Explanation: JavaScriptSerializer().Deserialize

Converts the specified JSON string to an object of type T.

Example:

string json = File.ReadAllText(Environment.CurrentDirectory + @"\JSON.txt");

Company company = new

System.Web.Script.Serialization.JavaScriptSerializer().Deserialize<Company>(

Reference: C# - serialize object to JSON format using JavaScriptSerializer

http://matijabozicevic.com/blog/csharp-net-development/csharp-serialize-object-to-json-format-using-javascriptserialization

Q118. - (Topic 2)

You write the following method (line numbers are included for reference only):

You need to ensure that the method extracts a list of URLs that match the following pattern: @http://(www\.)?([^\.]+)\.com;

Which code should you insert at line 07?

A. Option A

B. Option B

C. Option C

D. Option D

Answer: D

Explanation: * MatchCollection Represents the set of successful matches found by iteratively applying a regular expression pattern to the input string. The collection is immutable (read-only) and has no public constructor. The Regex.Matches method returns a MatchCollection object.

* List<T>.Add Method Adds an object to the end of the List<T>. Incorrect: Not A: ICollection.SyncRoot Property For collections whose underlying store is not publicly available, the expected implementation is to return the current instance. Note that the pointer to the current instance might not be sufficient for collections that wrap other collections; those should return the underlying collection's SyncRoot property.

Q119. - (Topic 2)

An application is throwing unhandled NullReferenceException and FormatException errors. The stack trace shows that the exceptions occur in the GetWebResult() method.

The application includes the following code to parse XML data retrieved from a web service. (Line numbers are included for reference only.)

You need to handle the exceptions without interfering with the existing error-handling infrastructure.

Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A. Option A

B. Option B

C. Option C

D. Option D

Answer: A,C

Explanation: A: The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails. It eliminates the need to use exception handling to test for a FormatException in the event that s is invalid and cannot be successfully parsed.

C: UnhandledException event handler If the UnhandledException event is handled in the default application domain, it is raised there for any unhandled exception in any thread, no matter what application domain the thread started in. If the thread started in an application domain that has an event handler for UnhandledException, the event is raised in that application domain.

Q120. - (Topic 2)

You have the following code (line numbers are included for reference only):

You need to ensure that new instances of Connection can be created only by other classes by calling the Create method. The solution must allow classes to inherit from Connection.

What should you do?

A. Option A

B. Option B

C. Option C

D. Option D

Answer: B

Explanation: The following list provides the main features of a static class:

* Contains only static members.

* Cannot be instantiated.

* Is sealed.

* Cannot contain Instance Constructors.

Creating a static class is therefore basically the same as creating a class that contains only static members and a private constructor. A private constructor prevents the class from being instantiated.

Reference: Static Classes and Static Class Members (C# Programming Guide)

https://msdn.microsoft.com/en-us/library/79b3xss3.aspx