Editing Constructor (object-oriented programming) (section)

==== C# static constructor ====
In [[C Sharp (programming language)|C#]], a ''static constructor'' is a static data initializer.<ref name="Albahari">{{cite book |last=Albahari |first=Joseph |title= C# 10 in a Nutshell |publisher= O'Reilly |isbn= 978-1-098-12195-2}}</ref>{{rp|111-112}}  Static constructors are also called ''class constructors''. Since the actual method generated has the name ''.cctor'' they are often also called "cctors".<ref>{{cite web|url=http://ericlippert.com/2013/02/06/static-constructors-part-one/ |title=Fabulous Adventures in Coding |publisher=Eric Lippert |date=2013-02-06|access-date=2014-04-05}}</ref><ref>{{cite book|url=https://books.google.com/books?id=oAcCRKd6EZgC&pg=PA222 |title=Expert .NET 2.0 IL Assembler |publisher=APress |date=2006-01-01|isbn=9781430202233 |access-date=2014-04-05}}</ref>

Static constructors allow complex static variable initialization.<ref>{{Cite web|url=https://www.microsoft.com/en-us/download/details.aspx?id=55984|title=Download Visual Studio 2005 Retired documentation from Official Microsoft Download Center|website=Microsoft Store - Download Center}}</ref>
Static constructors are called implicitly when the class is first accessed. Any call to a class (static or constructor call), triggers the static constructor execution.
Static constructors are [[thread safe]] and implement a [[singleton pattern]]. When used in a [[generic programming]] class, static constructors are called at every new generic instantiation one per type.<ref name=Skeet>{{cite book |last=Skeet|first=Jon|title= C# in Depth |date=23 March 2019 |publisher= Manning |isbn= 978-1617294532}}</ref>{{rp|38}}<ref name="Albahari"/>{{rp|111}} Static variables are instantiated as well.

<syntaxhighlight lang="csharp">
public class MyClass
{
    private static int _A;

    // Normal constructor
    static MyClass()
    {
        _A = 32;
    }

    // Standard default constructor
    public MyClass()
    {

    }
}
</syntaxhighlight>

<syntaxhighlight lang="csharp">
// Code somewhere
// Instantiating an object with the constructor above
// right before the instantiation
// The variable static constructor is executed and _A is 32
MyClass c = new MyClass();
</syntaxhighlight>