c# - 为什么 resharper 建议只读字段

Question

为什么 ReSharper 在下面的示例中为“设置”建议只读字段？

如果我理解正确的话，如果你只在构造函数中更改这个字段，你应该使用 readonly 修饰符，但在我的示例中，我也在同一个类的另一个方法中更改它。

我错过了什么？

public partial class OptionsForm : Form
{
    private Settings settings;

    public OptionsForm(Settings s)
    {
        settings = s;
    }

    private void SaveData()
    {
        settings.ProjectName = TextBoxProject.Text;
    }
}

Answer 1

当引用类型被声明为只读时，指针是不可变的，但它指向的对象不是。这意味着:

• a reference type data member can be initialized in order to point to an instance of a class, but once this is done it's not possible to make it point to another instance of a class outside of constructors
• the readonly modifier has no effect on the object the readonly data member points to.

阅读关于此的详细文章

Mark a C# class data member as readonly when it’s read only