What's the Difference Between `const` and `readonly` in C#?

The differences between the const and readonly in C#

and

are two keywords in C#. They play different roles in defining constant and only reading fields.

const readonly and

The difference:

const readonly Value:

The value must be assigned during the declaration, and the

value can be dynamically assigned before the constructor executes.
• Static features: const The field is hidden as a static field, and the readonly field can be an instance field or a static field.
• Reference method: The field is accessed by const, and the readonly field uses field reference access.
• Example and explanation: const ClassName.ConstantName Considering the following C# code: readonly

In this example,

cannot be changed after the statement, and can be assigned any other part of the class before the constructor or the constructor exits.

When to use Const or readonly:

<code class="language-csharp">public class ConstReadonlyExample
{
  public const int CONST_VALUE = 2; // 常量值必须立即赋值
  public readonly int RO_VALUE; // 只读值可以在运行时赋值
}</code>

When the value is known and does not change it during the program execution, CONST_VALUE is used. RO_VALUE

When the value may be changed at a certain time point,

can be used when it is at a certain time point.

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