[Free] 2018(June) Dumps4cert Microsoft 77-884 Dumps with VCE and PDF Download 21-30

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Programming in C#

Question No: 21 – (Topic 1)

You are creating an application that manages information about zoo animals. The application includes a class named Animal and a method named Save.

The Save() method must be strongly typed. It must allow only types inherited from the Animal class that uses a constructor that accepts no parameters.

You need to implement the Save() method. Which code segment should you use?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: C Explanation:

When you define a generic class, you can apply restrictions to the kinds of types that client code can use for type arguments when it instantiates your class. If client code tries to instantiate your class by using a type that is not allowed by a constraint, the result is a compile-time error. These restrictions are called constraints. Constraints are specified by using the where contextual keyword.

http://msdn.microsoft.com/en-us/library/d5x73970.aspx

Question No: 22 – (Topic 1)

You are creating an application that manages information about your company#39;s products. The application includes a class named Product and a method named Save.

The Save() method must be strongly typed. It must allow only types inherited from the Product class that use a constructor that accepts no parameters.

You need to implement the Save() method. Which code segment should you use?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: D Explanation:

When you define a generic class, you can apply restrictions to the kinds of types that client code can use for type arguments when it instantiates your class. If client code tries to instantiate your class by using a type that is not allowed by a constraint, the result is a compile-time error. These restrictions are called constraints.

Constraints are specified by using the where contextual keyword. http://msdn.microsoft.com/en-us/library/d5x73970.aspx

Question No: 23 – (Topic 1)

An application receives JSON data in the following format:

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The application includes the following code segment. (Line numbers are included for reference only.)

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You need to ensure that the ConvertToName() method returns the JSON input string as a Name object.

Which code segment should you insert at line 10?

  1. Return ser.Desenalize (json, typeof(Name));

  2. Return ser.ConvertToTypelt;Namegt;(json);

  3. Return ser.Deserializelt;Namegt;(json);

  4. Return ser.ConvertToType (json, typeof (Name));

Answer: C

Question No: 24 – (Topic 1)

You are developing an application that uses several objects. The application includes the

following code segment. (Line numbers are included for reference only.)

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You need to evaluate whether an object is null. Which code segment should you insert at line 03?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: D

Explanation: Use the == operator to compare values and in this case also use the null literal.

Question No: 25 DRAG DROP – (Topic 1)

You are developing an application by using C#. The application includes an array of decimal values named loanAmounts. You are developing a LINQ query to return the values from the array.

The query must return decimal values that are evenly divisible by two. The values must be sorted from the lowest value to the highest value.

You need to ensure that the query correctly returns the decimal values.

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.)

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Answer:

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Explanation:

Box 1: from

Box 2: where

Box 3: orderby Box 4: ascending

Box 5: select

Note: In a query expression, the orderby clause causes the returned sequence or subsequence (group) to be sorted in either ascending or descending order.

Examples:

// Query for ascending sort. IEnumerablelt;stringgt; sortAscendingQuery = from fruit in fruits

orderby fruit //quot;ascendingquot; is default select fruit;

// Query for descending sort. IEnumerablelt;stringgt; sortDescendingQuery = from w in fruits

orderby w descending select w;

Question No: 26 DRAG DROP – (Topic 1)

You are developing a custom collection named LoanCollection for a class named Loan class.

You need to ensure that you can process each Loan object in the LoanCollection collection

by using a foreach loop.

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.)

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Answer:

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Question No: 27 HOTSPOT – (Topic 1)

You are developing an application in C#.

The application will display the temperature and the time at which the temperature was recorded. You have the following method (line numbers are included for reference only):

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You need to ensure that the message displayed in the lblMessage object shows the time formatted according to the following requirements:

-> The time must be formatted as hour:minute AM/PM, for example 2:00 PM.

-> The date must be formatted as month/day/year, for example 04/21/2013.

-> The temperature must be formatted to have two decimal places, for example 23- 45.

Which code should you insert at line 04? (To answer, select the appropriate options in the answer area.)

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Answer:

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Question No: 28 – (Topic 1)

You are developing an application. The application includes a method named ReadFile that reads data from a file.

The ReadFile() method must meet the following requirements:

-> It must not make changes to the data file.

-> It must allow other processes to access the data file.

-> It must not throw an exception if the application attempts to open a data file that does not exist.

You need to implement the ReadFile() method. Which code segment should you use?

  1. var fs = File.Open(Filename, FileMode.OpenOrCreate, FileAccess.Read, FileShare.ReadWrite);

  2. var fs = File.Open(Filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

  3. var fs = File.Open(Filename, FileMode.OpenOrCreate, FileAccess.Read, FileShare.Write);

  4. var fs = File.ReadAllLines(Filename);

  5. var fs = File.ReadAllBytes(Filename);

Answer: A Explanation:

FileMode.OpenOrCreate – Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. If the file is opened with FileAccess.Read, FileIOPermissionAccess.Read permission is required. If the file access is FileAccess.Write, FileIOPermissionAccess.Write permission is required. If the file is opened with FileAccess.ReadWrite, both FileIOPermissionAccess.Read and FileIOPermissionAccess.Write permissions are required.

http://msdn.microsoft.com/en-us/library/system.io.filemode.aspx

FileShare.ReadWrite – Allows subsequent opening of the file for reading or writing.If this flag is not specified, any request to open the file for reading or writing (by this process or another process) will fail until the file is closed.However, even if this flag is specified, additional permissions might still be needed to access the file. http://msdn.microsoft.com/pl-pl/library/system.io.fileshare.aspx

Question No: 29 – (Topic 1)

You are implementing a method named FloorTemperature that performs conversions between value types and reference types. The following code segment implements the method. (Line numbers are included for reference only.)

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You need to ensure that the application does not throw exceptions on invalid conversions. Which code segment should you insert at line 04?

  1. int result = (int)degreesRef;

  2. int result = (int)(double)degreesRef;

  3. int result = degreesRef;

  4. int result = (int)(float)degreesRef;

Answer: D

Question No: 30 – (Topic 1)

You are developing an application that includes the following code segment. (Line numbers are included for reference only.)

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You need to ensure that the application accepts only integer input and prompts the user each time non-integer input is entered.

Which code segment should you add at line 19?

  1. If (!int.TryParse(sLine, out number))

  2. If ((number = Int32.Parse(sLine)) == Single.NaN)

  3. If ((number = int.Parse(sLine)) gt; Int32.MaxValue)

  4. If (Int32.TryParse(sLine, out number))

Answer: A Explanation:

B and C will throw exception when user enters non-integer value. D is exactly the opposite what we want to achieve.

Int32.TryParse – Converts the string representation of a number to its 32-bit signed integer equivalent. A return value indicates whether the conversion succeeded. http://msdn.microsoft.com/en-us/library/f02979c7.aspx

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