Chapter 8

Question 1

1. You are given an assignment to create a code generator to automate the task of creating repetitive code. Which namespace contains the types needed to generate code?
   a. System.Reflection
   b. CodeDom
   c. Reflection
   d. System.CodeDom

Answer 1

d. System.CodeDom

Question 2

2. Which code can create a lambda expression?
   a. delegate x = x => 5 + 5;
   b. delegate MySub(double x);
   MySub ms = delegate(double y) {
   y * y;
   }
   c. x => x * x;
   d. delegate MySub();
   MySub ms = x * x;

Answer 2

c. x => x * x;

Question 3

3. You are consulting for a company called Contoso and are taking over an application that was built by a third-party software company. There is an executable that is currently not working because it is missing a DLL that is referenced. How can you figure out which DLLs the application references?
   a. Create an instance of the Assembly class, load the assembly, and iterate through the ReferencedAssemblies property.
   b. Create an instance of the Assembly class, load the assembly, and call the GetReferencedAssemblies method.
   c. Create an instance of the Assembly class, load the assembly, and iterate through the Modules property.
   d. Create an instance of the Assembly class, load the assembly, and call the GetModulesReferenced method.

Answer 3

b. Create an instance of the Assembly class, load the assembly, and call the GetReferencedAssemblies method.

Question 4

4. You are a developer for a finance department and are building a method that uses reflection to get a reference to the type of object that was passed as a parameter. Which syntax can be used to determine an object’s type?
   a. Type myType = typeof(myParameter);
   b. Object myObject =
   myParameter.GetType(object);
   c. Object myObject = typeof(myParameter);
   d. Type myType = myParameter.GetType();

Answer 4

d. Type myType = myParameter.GetType();

Question 5

5. You are asked to create a custom attribute that has a single property, called Version, that allows the caller to determine the version of a method. Which code can create the attribute?
   a. class MyCustomAttribute :
   System.Reflection.Attribute
   {
   public string Version { get; set; }
   }
   b. class MyCustomAttribute : System.Attribute
   {
   public string Version { get; set; }
   }
   c. class MyCustomAttribute :
   System.AttributeUsage
   {
   public string Version { get; set; }
   }
   d. class MyCustomAttribute :
   System.ClassAttribute
   {
   public string Version { get; set; }
   }

Answer 5

b.	class MyCustomAttribute : System.Attribute
    {
        public string Version { get; set; }
    }

Question 6

6. Which class in the System.Reflection namespace would you use if you want to determine all the classes contained in a DLL file?
   a. FileInfo
   b. Assembly
   c. Type
   d. Module

Answer 6

b. Assembly

Question 7

7. Which method of the Assembly class allows you to get all the public types defined in the Assembly?
   a. DefinedTypes
   b. Types
   c. GetExportedTypes
   d. GetModules

Answer 7

c. GetExportedTypes

Question 8

8. Which property of the Assembly class returns the name of the assembly?
   a. Name
   b. FullyQualifiedName
   c. Location
   d. FullName

Answer 8

d. FullName

Question 9

9. Which method of the Assembly class returns an instance of the current assembly?
   a. GetExecutingAssembly
   b. GetAssembly
   c. GetCurrentAssembly
   d. Assembly

Answer 9

a. GetExecutingAssembly

Question 10

10. Which syntax will Load an Assembly? (Choose all that apply)
    a. Assembly.Load(“System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089”);
    b. Assembly.LoadFrom(@”c:\MyProject\
    Project1.dll”);
    c. Assembly.LoadFile(@”c:\MyProject\
    Project1.dll”);
    d. Assembly.ReflectionOnlyLoad((“System.Data,
    Version=4.0.0.0, Culture=neutral,
    PublicKeyToken=b77a5c561934e089”);

Answer 10

a. Assembly.Load(“System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089”);
b. Assembly.LoadFrom(@”c:\MyProject\
Project1.dll”);
c. Assembly.LoadFile(@”c:\MyProject\
Project1.dll”);
d. Assembly.ReflectionOnlyLoad((“System.Data,
Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089”);

Question 11

11. Which method should you call if you want the .NET Framework to look in the load-context to load an Assembly?
    a. ReflectionOnlyLoad
    b. LoadFrom
    c. Load
    d. LoadFromContext

Answer 11

c. Load

Question 12

12. Which method should you call if you want the .NET Framework to look in the load-from context?
    a. ReflectionOnlyLoad
    b. LoadFrom
    c. Load
    d. LoadFromContext

Answer 12

b. LoadFrom

Question 13

13. Which line creates an instance of a DataTable using reflection?
    a. myAssembly.CreateInstance
    (“System.Data.DataTable”);
    b. DataTable.GetType();
    c. typeof(“System.Data.DataTable”);
    d. myType.CreateInstance
    (“System.Data.DataTable”);

Answer 13

a. myAssembly.CreateInstance

(“System.Data.DataTable”);

Question 14

14. Which class would you create if you wanted to determine all the properties contained in a class using reflection?
    a. Assembly
    b. Class
    c. Property
    d. Type

Answer 14

d. Type

Question 15

15. How can you determine if a class is public or private?
    a. Create an instance of the Type class using the typeof keyword and then examine the IsPublic property of the Type variable.
    b. Create an instance of the Type class using the typeof keyword and then examine the IsPrivate property of the Type variable.
    c. Create an instance of the class within a try catch block and catch the exception if you cannot create an instance of the class.
    d. Create an instance of the class and check the IsPublic property.

Answer 15

a. Create an instance of the Type class using the typeof keyword and then examine the IsPublic property of the Type variable.

Question 16

16. Which class in the System.Reflection namespace is used to represent a field defined in a class?
    a. PropertyInfo
    b. FieldInfo
    c. Type
    d. EventInfo

Answer 16

b. FieldInfo

Question 17

17. Which property of the Type class can you use to determine the number of dimension for an array?
    a. GetDimension
    b. GetRank
    c. GetDimensions
    d. GetArrayRank

Answer 17

d. GetArrayRank

Question 18

18. Which statement will returns a private, instance field called “myPrivateField” using reflection? Assume the myClass variable is an instance of a class.
    a. myClass.GetType().GetField
    (“myPrivateField”, BindingFlags.NonPublic |
    BindingFlags.Instance)
    b. myClass.myPrivateField
    c. myClass.GetType().GetField
    (“myPrivateField”)
    d. myClass. GetType().GetField(“myPrivateField”,
    BindingFlags.NonPublic &
    BindingFlags.Instance)

Answer 18

a. myClass.GetType().GetField
(“myPrivateField”, BindingFlags.NonPublic |
BindingFlags.Instance)

Question 19

19. Which method of the MethodInfo class can be used to execute the method?
    a. Execute
    b. Invoke
    c. Call
    d. Load

Answer 19

b. Invoke

Question 20

20.	Which statement uses reflection to execute the method and passes in two parameters given the following code block? 
MyClass myClass = new MyClass();
MethodInfo myMethod = typeof(MyClass).GetMethod(“Multiply”);
a.	myMethod.Execute(myClass, new object[] { 4, 
5 });
b.	myMethod.Execute(MyClass, new object[] { 4, 
5 });
c.	myMethod.Invoke(myClass, new object[] { 4, 
5 });
d.	myMethod.Invoke(MyClass, new object[] { 4, 
5 });

Answer 20

c. myMethod.Invoke(myClass, new object[] { 4,

5 });

Question 21

E1. Which class name follows the standard naming convention for a custom attribute class?

a. AttributeMyCustom
b. MyCustomAttribute
c. MyCustom
d. MyCustom_Attribute

Answer 21

b. MyCustomAttribute

Question 22

E2. How can you limit the scope of a custom attribute that you are creating so that it can be used only by a class?
a. Set the custom attribute’s TargetLevel property to Class.
b. Add the following attribute above the custom attribute’s class declaration:
[System.AttributeUsage(AttributeTargets.Class)]
c. Set the custom attribute’s TargetLevel attribute to Class.
d. Set the custom attribute’s Scope property to Class.

Answer 22

b. Add the following attribute above the custom attribute’s class declaration:

Question 23

E3.	If you have created a custom attribute class called DataMappingAttribute and have used it in a class called Person, which statement will return all the DataMappingAttributes that have been applied to the Person class?
a.	typeof(DataMappingAttribute).
GetCusomAttributes(typeof(Person),
 false);
b.	typeof(Person).GetAttributes(typeof
(DataMappingAttribute), false);
c.	typeof(DataMappingAttribute).
GetAttributes(typeof(Person), false);
d.	typeof(Person).GetCusomAttributes
(typeof(DataMappingAttribute), false);

Answer 23

d. typeof(Person).GetCusomAttributes

(typeof(DataMappingAttribute), false);

Question 24

E4. Which class in the CodeDOM is the top-level class that is the container for all other objects within the class?

a. CodeNamespace
b. CodeCompileUnit
c. CodeConstructor
d. CodeDOMProvider

Answer 24

b. CodeCompileUnit

Question 25

``` E5. Which statement generates a namespace statement using the CodeDOM? a. Namespace namespace = new Namespace("MyNamespace"); b. string namespace = Namespace.Create("MyNamespace"); c. CodeNamespace codeNamespace = new CodeNamespace("MyNamespace"); d. string namespace = CodeNamespace.Create("MyNamespace"); ```

Answer 25

``` c. CodeNamespace codeNamespace = new CodeNamespace("MyNamespace"); ```

Question 26

E6. Which class in the CodeDOM is used to create a statement that declares a class? a. CodeClassDeclaration b. CodeCompileUnit c. CodeTypeDeclaration d. CodeClass

Answer 26

c. CodeTypeDeclaration

Question 27

``` E7. Which statement should be added to the following block of code to set a field’s type to a double using the CodeDOM? CodeMemberField xField = new CodeMemberField(); xField.Name = "x"; a. xField.Type = new CodeTypeReference(typeof(double)); b. xField.Type = double; c. xField.Type = typeof(double)); d. xField.Type = new double(); ```

Answer 27

a. xField.Type = new CodeTypeReference(typeof(double));

Question 28

E8. Which property of the CodeMemberProperty class should be set to true to tell the compiler to generate a set accessor using the CodeDOM? a. Set b. HasSet c. CreateSet d. GenerateSet

Answer 28

b. HasSet

Question 29

E9. Which class in the CodeDOM is used to represent either the this keyword in C# or the Me keyword in VB.NET? a. CodeMeReference b. CodeThisReference c. CodeMeReferenceExpression d. CodeThisReferenceExpression

Answer 29

d. CodeThisReferenceExpression

Question 30

E10. Which property of the CodeConditionStatement is used to add statements to the true path of logic using the CodeDOM? a. TrueConditions b. TrueStatements c. TrueCodeStatements d. TrueExpressions

Answer 30

b. TrueStatements

Question 31

E11. Which class in the CodeDOM is used to call a method? a. CodeMethodInvoke b. CodeMethodInvokeExpression c. CodeMethodCall d. CodeMethodCallExpression

Answer 31

b. CodeMethodInvokeExpression

Question 32

E12. Which class in the CodeDOM is used to generate a class file? a. CodeDOMProvider b. CodeDOMTextWriter c. CodeDOMClassWriter d. CodeDOMGenerator

Answer 32

a. CodeDOMProvider

Question 33

E13. You are looking at the output of a file generated using the CodeDOM. The file is in C# and you notice that the brackets for all your methods are not on separate lines. Which property of the CodeGeneratorOptions class can you use to force the brackets to be on separate lines, and what should the property be set to? a. BracketStyle = BracketStyle.Separate b. BracingStyle = BracingStyle.Separate c. BracingStyle = "C" d. BracketStyle = "C"

Answer 33

c. BracingStyle = "C"

Question 34

E14. Which statement is a valid expression lambda? a. x => x * y b. x => x * x c. x => { int y; y = x * x; } d. x => y

Answer 34

b. x => x * x | (Answer B is an expression lamba; answer C is a statement lambda)

Question 35

E15. Which statement should be on the left side of a goes to operator if you want to pass two parameters to a lambda expression? a. { x, y } b. ( x, y ) c. { x => y } d. ( x => y )

Answer 35

b. ( x, y )

Question 36

E16. What is the correct delegate declaration for the following method? void int Multiply(int x, int y) a. int MyDelegate(int a, int b) as delegate; b. delegate int MyDelegate(int a, int b); c. int Multiply(int x, int y); d. delegate void MyDelegate(void a, void b);

Answer 36

b. delegate int MyDelegate(int a, int b);

Question 37

E17. True or false? You can reference local variables that are not passed as parameters in an anonymous method. a. True b. False

Answer 37

a. True

Question 38

E18. Which method of the CodeDOMProvider generates a code file? a. GenerateCode b. GenerateCodeFileFromCompileUnit c. GenerateFileFromCompileUnit d. GenerateCodeFromCompileUnit

Answer 38

c. GenerateFileFromCompileUnit

Question 39

E19. Which class in the CodeDOM is used to create a method declaration statement? a. MethodDeclaration b. CodeMethodDeclaration c. CodeMemberMethod d. CodeMemberDeclaration

Answer 39

c. CodeMemberMethod

Question 40

E20. Which is the => syntax referred to as in a lambda expression? a. The parameter operator b. The goes to operator c. The lambda operator d. The expression operator

Answer 40

b. The goes to operator