Const and readonly usage of c #

1. Application Scenario Reproduction

A simple application solution is as follows:

The CSharpLib class library defines a simple SomeType class as follows:

1 namespace CSharpLib 2 { 3      public class SomeType 4      { 5          public const int ConstField = 50; 6          public static readonly int ReadonlyField = 50; 7      } 8 }

In the ConsoleApp of the console application, reference the class library CSharpLib and write the following code:

01 using System; 02   03 namespace ConsoleApp 04 { 05      using CSharpLib; 06   07      class Program 08      { 09          static void Main( string [] args) 10          { 11              Console.WriteLine( "Const field is {0}." , SomeType.ConstField); 12              Console.WriteLine( "Readonly field is {0}." , SomeType.ReadonlyField); 13              Console.ReadKey(); 14          } 15      } 16 }

In this way, the output of this console application is 50, and the result should be expected by every developer, without any suspicious points.

When we change the constants in the class library CSharpLib:

1 namespace