Page 188 - CSharp/C#

Usage

Initializers must evaluate to static expressions, just like field initializers. If you need to reference
non-static members, you can either initialize properties in constructors like before, or use
expression-bodied properties. Non-static expressions, like the one below (commented out), will
generate a compiler error:

// public decimal X { get; set; } = InitMe(); // generates compiler error

decimal InitMe() { return 4m; }

But static methods can be used to initialize auto-properties:

public class Rectangle
{
public double Length { get; set; } = 1;
public double Width { get; set; } = 1;
public double Area { get; set; } = CalculateArea(1, 1);

public static double CalculateArea(double length, double width)
{
return length * width;
}
}

This method can also be applied to properties with different level of accessors:

public short Type { get; private set; } = 15;

The auto-property initializer allows assignment of properties directly within their declaration. For
read-only properties, it takes care of all the requirements required to ensure the property is
immutable. Consider, for example, the FingerPrint class in the following example:

public class FingerPrint
{
public DateTime TimeStamp { get; } = DateTime.UtcNow;

public string User { get; } =
System.Security.Principal.WindowsPrincipal.Current.Identity.Name;

public string Process { get; } =
System.Diagnostics.Process.GetCurrentProcess().ProcessName;
}

View Demo

Cautionary notes

https://riptutorial.com/ 134