C# Programming Study #2

  • readonly (C# Reference)

    • readonly  关键字是可以在字段上使用的修饰符。  当字段声明包括 readonly 修饰符时,该声明引入的字段赋值只能作为声明的一部分出现,或者出现在同一类的构造函数中
    • class Age
          {
              readonly int _year;
              Age(int year)
              {
                  _year = year;
              }
              void ChangeYear()
              {
                  //_year = 1967; // Compile error if uncommented.
              }
          }
      
    • readonly 关键字与 const 关键字不同。
    • const   字段只能在该字段的声明中初始化。
    • readonly   字段可以在声明或构造函数中初始化。 因此,根据所使用的构造函数,readonly 字段可能具有不同的值。 另外,const 字段为编译时常数,而 readonly 字段可用于运行时常数
时间: 2024-11-09 06:12:44

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