Csharp C# 从 JSON 反序列化 KeyValuePair

这是this question(它的一个子集)绝对最简单的版本.

using System;
using System.Collections.Generic;
using System.Text.Json;


public class Program
{
    public class Subscription
    {
        public bool HasRead { get; set; } = true;
        public string TimeStamp { get; set; } = "";
    }



    public static void Main()
    {
        // this input format is a requirement. It cannot be changed.
        string json = @"
          {
            ""305FDF11-25E7-43DE-B09D-DFFC17C79599"": {
              ""hasRead"": true, // EDIT: Removed the double quotes around the boolean. That was not the core issue.
              ""Timestamp"": ""XXX""
            }
          }
        ";

        // I'm trying to find the correct deserialization type in C#
        var deser = JsonSerializer.Deserialize<KeyValuePair<string, Subscription>>(json,
            new JsonSerializerOptions(JsonSerializerDefaults.Web));

        // System.Text.Json.JsonException: 
        //'The JSON value could not be converted to 
        //System.Collections.Generic.KeyValuePair
    }
}

我不明白为什么它不能被反序列化.

注:我痴迷于KeyValuePair型，但可能与油田的shell 或其他明显的东西有关.

其他注意事项:当我将KeyValuePair<string, Subscription>更改为KeyValuePair<string, object>以使其更宽松时，它仍然失败.