value Keyword
This page was last reviewed on Mar 22, 2023.
Dot Net Perls
Value. This is a keyword—it is used in properties. In properties in C#, we enjoy a clear and easy-to-read syntax form—and "value" is a part of this.
With parameters in a property, we can use the special keyword "value." This way we do not need to specify the type. The type is determined by the enclosing property type.
An example. In this program, each property has a set accessor that uses the value parameter. We see 2 properties, PropertyInt and PropertyString.
Start In the PropertyInt set accessor, the value parameter is written to the console.
int, uint
Next For PropertyString, the value is a string. It is checked for a valid state. The program writes the values.
Tip You can assign the "value" parameter to a new value. We can change a "value" of null to an empty string literal.
using System; class Program { int PropertyInt { get { return 1; } set { Console.WriteLine(value); } } string _backing; string PropertyString { get { return this._backing; } set { if (value == null) { throw new ArgumentNullException("value"); } this._backing = value; } } static void Main() { Program program = new Program(); // Use PropertyInt. program.PropertyInt = 5; Console.WriteLine(program.PropertyInt); // Use PropertyString. program.PropertyString = "test"; Console.WriteLine(program.PropertyString); } }
5 1 test
A discussion. The C# specification refers to "value" in its description of Accessors in Properties. On page 481, it states "The implicit parameter of a set accessor" is always value.
Also It might help with understanding how the C# language works to investigate how "value" is implemented here.
Detail These are actually compiled into methods such as Set_PropertyInt and Get_PropertyInt.
Intermediate Language
Then The set method has a regular formal parameter list. The formal parameter has the identifier "value."
A summary. We examined the value parameter in properties and referenced the language specification. We then discovered the underlying implementation of the value parameter in properties.
Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.
Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
This page was last updated on Mar 22, 2023 (edit).
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