字节跳动请教 MongoDB 驱动中的一段继承代码含义

程序员面试经验

hjahgdthab750：

using MongoDB.Driver; using System;  /// <summary> /// The result of a delete operation. /// </summary> public abstract class DeleteResult { 	/// <summary> 	/// The result of an acknowledged delete operation. 	/// </summary> 	public class Acknowledged : DeleteResult 	{ 		private readonly long _deletedCount;  		/// <inheritdoc /> 		public override long DeletedCount => _deletedCount;  		/// <inheritdoc /> 		public override bool IsAcknowledged => true;  		/// <summary> 		/// Initializes a new instance of the <see cref="T:MongoDB.Driver.DeleteResult.Acknowledged" /> class. 		/// </summary> 		/// <param name="deletedCount">The deleted count.</param> 		public Acknowledged (long deletedCount); 	}  	/// <summary> 	/// The result of an unacknowledged delete operation. 	/// </summary> 	public class Unacknowledged : DeleteResult 	{ 		private static Unacknowledged __instance = new Unacknowledged ();  		/// <summary> 		/// Gets the instance. 		/// </summary> 		public static Unacknowledged Instance => __instance;  		/// <inheritdoc /> 		public override long DeletedCount { 			get; 		}  		/// <inheritdoc /> 		public override bool IsAcknowledged => false;  		private Unacknowledged (); 	}  	/// <summary> 	/// Gets the deleted count. If IsAcknowledged is false, this will throw an exception. 	/// </summary> 	public abstract long DeletedCount { 		get; 	}  	/// <summary> 	/// Gets a value indicating whether the result is acknowledged. 	/// </summary> 	public abstract bool IsAcknowledged { 		get; 	}  	internal static DeleteResult FromCore (BulkWriteResult result); }  

上面的 Acknowleged 继承于 DeleteResult
可以是为啥要写到 DeleteResult 之中？岂不是造成循环了？

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