C# 9.0 记录 - ToString 不继承

考虑：

// the ratioale for Wrapper is that it has a Json serializer that  
// serialize through Field (not included in this example)
record Wrapper<T> where T : notnull {
  protected Wrapper(T field) => Field = field; 
  protected Wrapper(Wrapper<T> wrapper) => Field = wrapper.Field;
  protected readonly T Field;
  public override string ToString() => Field.ToString() ?? "";
}

record MyRec : Wrapper<string> {
    public MyRec(string s) : base(s) {}
}

public static class Program {
  public static void Main(string[] args) {
      var r = new MyRec("hello");
      Console.WriteLine(r.ToString());
  }
}

sharplab https://sharplab.io/#v2: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

看起来像基地ToString不是继承的，编译器仍然自动生成派生的Tostring

这是为什么 ？有什么好的办法吗？

有一条评论为我解决了这个问题。肖恩说如果你添加sealed该方法阻止编译器合成ToString方法见下：

public sealed override string ToString() => Value;

请注意，密封覆盖的能力ToString was 在 C# 10 中引入。 https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10#record-types-can-seal-tostring