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1
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Framework Fundamentals
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4. Modify the Person.ToString method to also display the gender, as the following code sample demonstrates:
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' VB Public Overloads Overrides Function ToString() As String Return firstName + " " + lastName + " (" + gender.ToString() + "), age " + age.ToString End Function // C# public override string ToString() { return firstName + " " + lastName + " (" + gender + "), age " + age; }
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5. Modify your Main code to properly construct an instance of the Person class, as the following code sample demonstrates:
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' VB Sub Main() Dim p As Person = New Person("Tony", "Allen", 32, Person.Genders.Male) Console.WriteLine(p) End Sub // C# static void Main(string[] args) { Person p = new Person("Tony", "Allen", 32, Person.Genders.Male); Console.WriteLine(p.ToString()); }
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6. Run the console application to verify that it works correctly.
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Lesson Summary
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The .NET Framework includes a large number of built-in types that you can use directly or use to build your own custom types. Value types directly contain their data, offering excellent performance. However, value types are limited to types that store very small pieces of data. In the .NET Framework, all value types are 16 bytes or shorter. You can create user-defined types that store multiple values and methods. In object-oriented development environments, a large portion of your application logic will be stored in user-defined types. Enumerations improve code readability by providing symbols for a set of values.
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Lesson 1: Using Value Types
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Lesson Review
You can use the following questions to test your knowledge of the information in Lesson 1, Using Value Types. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. Which of the following are value types (Choose all that apply.) A. Decimal B. String C. System.Drawing.Point D. Integer 2. You pass a value-type variable into a procedure as an argument. The procedure changes the variable; however, when the procedure returns, the variable has not changed. What happened (Choose one.) A. The variable was not initialized before it was passed in. B. Passing a value type into a procedure creates a copy of the data. C. The variable was redeclared within the procedure level. D. The procedure handled the variable as a reference. 3. Which is the correct declaration for a nullable integer A.
' VB Dim i As Nullable<Of Integer> = Nothing // C# Nullable(int) i = null;
' VB Dim i As Nullable(Of Integer) = Nothing // C# Nullable<int> i = null;
1
Framework Fundamentals
' VB Dim i As Integer = Nothing // C# int i = null;
' VB Dim i As Integer(Nullable) = Nothing // C# int<Nullable> i = null;
4. You need to create a simple class or structure that contains only value types. You must create the class or structure so that it runs as efficiently as possible. You must be able to pass the class or structure to a procedure without concern that the procedure will modify it. Which of the following should you create A. A reference class B. A reference structure C. A value class D. A value structure
Lesson 2: Using Common Reference Types
Lesson 2: Using Common Reference Types
Most types in the .NET Framework are reference types. Reference types provide a great deal of flexibility, and they offer excellent performance when passing them to methods. The following sections introduce reference types by discussing common built-in classes. Lesson 4, Converting Between Types, covers creating classes, interfaces, and delegates.
After this lesson, you will be able to:
Explain the difference between value types and reference types. Describe how value types and reference types differ when assigning values. List the built-in reference types. Describe when you should use the StringBuilder type. Create and sort arrays. Open, read, write, and close files. Detect when exceptions occur and respond to the exception.
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