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= [https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/record#immutability Immutability] = | |||
Immutability means the data of the record don't change after its creation.<br> | |||
It is useful when you need thread-safe data-centric types or expect hash codes remaining the sames. | |||
= [https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/record#value-equality Value equality] = | |||
Two record objects are equal if they are of the same type and store the same values. | |||
Version du 9 août 2024 à 13:41
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Definition
Built-in functionality for encapsulating immutable data.
C# 10 allows the record class syntax as a synonym to clarify a reference type, and record struct to define a value type.
Primary constructor
When you declare a primary constructor on a record, the compiler generates public properties for the primary constructor parameters.
|
public record Person(string FirstName, string LastName);
// with the generated properties it is equivalent to
public record Person
{
public required string FirstName { get; init; }
public required string LastName { get; init; }
};
// record struct value type with immutable properties
public readonly record struct Point(double X, double Y);
// equivalent to
public record struct Point
{
public double X { get; init; }
public double Y { get; init; }
}
// record struct value type with mutable properties
public record struct Point(double X, double Y);
// equivalent to
public record struct Point
{
public double X { get; set; }
public double Y { get; set; }
}
|
Immutability
Immutability means the data of the record don't change after its creation.
It is useful when you need thread-safe data-centric types or expect hash codes remaining the sames.
Value equality
Two record objects are equal if they are of the same type and store the same values.
