70-536: TS:MS.NET Framework 2.0-Application Develop Foundation
1.You are writing a custom dictionary. The custom-dictionary class is named MyDictionary. You need to
ensure that the dictionary is type safe. Which code segment should you use?
A. class MyDictionary : Dictionary<string, string>
B. class MyDictionary : HashTable
C. class MyDictionary : IDictionary
D. class MyDictionary { … }
Dictionary<string, string> t = new Dictionary<string, string>();
MyDictionary dictionary = (MyDictionary)t;
Answer: A
2.You are creating a class named Age. You need to ensure that the Age class is written such that
collections of Age objects can be sorted. Which code segment should you use?
A. public class Age { public int Value;
public object CompareTo(object obj)
{ if (obj is Age)
{ Age _age = (Age) obj;
return Value.CompareTo(obj); }
throw new ArgumentException(”object not an Age”); } }
B. public class Age {
public int Value;
public object CompareTo(int iValue) {
try {
return Value.CompareTo(iValue); }
catch {
throw new ArgumentException (”object not an Age”); } } }
C. public class Age : IComparable {
public int Value;
public int CompareTo(object obj)
{ if (obj is Age) {
Age _age = (Age) obj;
return Value.CompareTo(_age.Value); }
throw new ArgumentException(”object not an Age”); } }
D. public class Age : IComparable {
public int Value;
public int CompareTo(object obj) {
try {
return Value.CompareTo(((Age) obj).Value); }
catch {
return -1; } } }
Answer: C
3.You are creating a class to compare a specially-formatted string. The default collation comparisons do
not apply. You need to implement the IComparable<string> interface. Which code segment should you
use?
A. public class Person : IComparable<string>{ public int CompareTo(string other){ … }}
B. public class Person : IComparable<string>{ public int CompareTo(object other){ … }}
C. public class Person : IComparable<string>{ public bool CompareTo(string other){ … }}
D. public class Person : IComparable<string>{ public bool CompareTo(object other){ … }}
Answer: A
4.You are developing a custom-collection class. You need to create a method in your class. You need to
ensure that the method you create in your class returns a type that is compatible with the Foreach
statement. Which criterion should the method meet?
A. The method must return a type of either IEnumerator or IEnumerable.
B. The method must return a type of IComparable.
C. The method must explicitly contain a collection.
D. The method must be the only iterator in the class.
Answer: A
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