A static constructor is used to
initialize any static data, or to perform a particular action that needs to be performed
once only so in C# there are two types of the constructor.
1. Class constructor (static constructor).
2. Instance constructor (non-static constructor).
A static
constructor is used to initializing static data members as soon as the class is
referenced the first time, whereas an instance constructor is used to create an instance of that class with <new> keyword.
Example of Static
constructor:-
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using System;
namespace StaticConstructorExampleNameSpace
{
class StaticConstructorExampleClass
{
private static int Value;
//Static constructor, value of data member id is set
conditionally here.
//This type of initialization is not possible at the time
of declaration.
static StaticConstructorExampleClass()
{
if (StaticConstructorExampleClass.Value
< 10)
{
Value
= 30;
}
else
{
Value
= 200;
}
Console.WriteLine("Static<Class>
Constructor for Class StaticConstructorExampleClass Called..");
}
public static void StaticMethod_PrintVlaue()
{
Console.WriteLine("StaticConstructorExampleClass.id
= " + Value);
}
static void Main(string[] args)
{
//Print the value
StaticConstructorExampleClass.StaticMethod_PrintVlaue();
Console.ReadLine();
}
}
}
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Note:-
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1. A
static constructor does not take access modifiers or have parameters.
2. A
static constructor cannot be called directly.
3. The
user has no control over when the static constructor is executed in the
program.
4. A
typical use of static constructors is when the class is using a log file and
the constructor is used to write entries to this file.
5. A
static constructor is called automatically to initialize the class before the
first instance is created or any static members are referenced.
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