为什么没有 ReadOnlyList C# 的 System.Collections 库中的类？

发布于 2024-09-25 17:39:16 字数 1013 浏览 10 评论 0 原文

通过阅读有关在 C# 中创建只读原始向量的问题（基本上，您不能这样做），

public readonly int[] Vector = new int[]{ 1, 2, 3, 4, 5 }; // You can still changes values

我了解了 ReadOnlyCollectionBase。这是对象容器的基类，允许访问但不能修改其位置。甚至在Microsoft Docs中也有一个示例。

ReadOnlyCollectionBase 类 - Microsoft Docs

我稍微修改了示例使用任何类型：

public class ReadOnlyList<T> : ReadOnlyCollectionBase {
    public ReadOnlyList(IList sourceList)  {
      InnerList.AddRange( sourceList );
    }

    public T this[int index]  {
      get  {
         return( (T) InnerList[ index ] );
      }
    }

    public int IndexOf(T value)  {
      return( InnerList.IndexOf( value ) );
    }



    public bool Contains(T value)  {
      return( InnerList.Contains( value ) );
    }

}

...并且它有效。我的问题是，为什么 C# 标准库中不存在这个类，可能在 System.Collections.Generic 中？我错过了吗？它在哪里？谢谢。

原文

Reading about the problem of creating a read only primitive vector in C# (basically, you cannot do that),

public readonly int[] Vector = new int[]{ 1, 2, 3, 4, 5 }; // You can still changes values

I learnt about ReadOnlyCollectionBase. This is a base class for containers of objects that let their positions be accessed but not modified. Even there is an example in Microsoft Docs.

ReadOnlyCollectionBase Class - Microsoft Docs

I slightly modified the example to use any type:

public class ReadOnlyList<T> : ReadOnlyCollectionBase {
    public ReadOnlyList(IList sourceList)  {
      InnerList.AddRange( sourceList );
    }

    public T this[int index]  {
      get  {
         return( (T) InnerList[ index ] );
      }
    }

    public int IndexOf(T value)  {
      return( InnerList.IndexOf( value ) );
    }



    public bool Contains(T value)  {
      return( InnerList.Contains( value ) );
    }

}

... and it works. My question is, why does not exist this class in the standard library of C#, probably in System.Collections.Generic? Am I missing it? Where is it?
Thank you.