using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
/// <summary>
/// The author :it jin
/// Function: c# The difference between read-only fields and constants, and the use of static constructors
/// </summary>
class Program
{
static void Main(string[] args)
{
Console.WriteLine(test.a);
Console.WriteLine(test.b);
Console.Read();
}
}
public class test
{
public static readonly int b;// Read-only fields are available static The keyword , Read-only fields can be assigned without initialization, and read-only fields can only be assigned when constructors or variables are initialized
public const int a=1;// Constants cannot be used static The keyword , Constants must be initialized and assigned at the time of definition
static test()// Static constructor, called before class instantiation , And only perform 1 time
{
b = 2;// Because it is a read-only field, it can only be initialized in the constructor and changed to a read-only field static Type, so you need to assign it in the static constructor
}
void aa()
{
//a = 1; error
//b=1; error
}
}
}