Property definition syntax uses three contextual keywords You use the in C#

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Property definition syntax uses three contextual keywords You use the
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get and set keywords to identify either the retrieval or the assignment
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portion of the property, respectively In addition, the setter uses the value keyword to refer to the right side of the assignment operation When ProgramMain() calls employeeFirstName = "Inigo", therefore, value is set to "Inigo" inside the setter and can be used to assign _FirstName Listing 517 s property implementations are the most common When the getter is called (such as in ConsoleWriteLine(employee2FirstName)), the value from the field (_FirstName) is returned
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Automatically Implemented Properties In C# 30, property syntax includes a shorthand version Since a property with a single backing field that is assigned and retrieved by the get and set
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5: Classes
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accessors is so trivial and common (see the implementations of FirstName and LastName), the C# 30 compiler allows the declaration of a property without any accessor implementation or backing field declaration Listing 518 demonstrates the syntax, and Output 56 shows the results
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Listing 518: Automatically Implemented Properties
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class Program { static void Main() { Employee employee1 = new Employee(); Employee employee2 = new Employee(); // Call the FirstName property's setter employee1FirstName = "Inigo"; // Call the FirstName property's getter SystemConsoleWriteLine(employee1FirstName); // Assign an auto-implemented property employee2Title = "Computer Nerd"; employee1Manager = employee2; // Print employee1's manager's title SystemConsoleWriteLine(employee1ManagerTitle); } }
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class Employee { // FirstName property public string FirstName { get { return _FirstName; } set { _FirstName = value; } } private string _FirstName;
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// LastName property public string LastName { get { return _LastName; } set { _LastName = value; } } private string _LastName; // // Title property public string Title { get; set; } // Manager property public Employee Manager { get; set; } }
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OUTPUT 56:
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Inigo Computer Nerd
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Auto-implemented properties provide for a simpler way of writing properties in addition to reading them Furthermore, when it comes time to add something such as validation to the setter, any existing code that calls the property will not have to change even though the property declaration will have changed to include an implementation Throughout the remainder of the book, I will frequently use this C# 30 or later syntax without indicating that it is a C# 30 introduced feature
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Naming Conventions Because the property name is FirstName, the field name changed from earlier listings to _FirstName Other common naming conventions for the private field that backs a property are _firstName and m_FirstName
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(a holdover from C++ where the m stands for member variable), as well as the camel-case convention, just as with local variables3 Regardless of which naming pattern you use for private fields, the coding standard for public fields and properties is Pascal case Therefore, public properties should use the LastName and FirstName type patterns Similarly, if no encapsulating property is created around a public field, Pascal case should be used for the field
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Using Properties with Validation Notice in Listing 519 that the Initialize() method of Employee uses the property rather than the field for assignment as well Although not required, the result is that any validation within the property setter will be invoked both inside and outside the class Consider, for example, what would happen if you changed the LastName property so that it checked value for null or an empty string, before assigning it to _LastName
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Listing 519: Providing Property Validation
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class Employee { // public void Initialize( string newFirstName, string newLastName) { // Use property inside the Employee // class as well FirstName = newFirstName; LastName = newLastName; }
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// LastName property public string LastName { get { return _LastName; } set
3 I prefer _FirstName because the m in front of the name is unnecessary when compared with simply _, and by using the same casing as the property, it is possible to have only one string within the Visual Studio code template expansion tools, instead of having one for both the property name and the field name