Newtonsoft 13.0.3的JsonPath是否支持嵌套过滤器？求目标表达式

适用的JsonPath表达式 #

针对Newtonsoft.Json 13.0.3版本，可使用以下两种方式实现需求：

方式1：依赖.NET Linq扩展方法（推荐） #

该写法利用Newtonsoft对.NET方法的支持，逻辑清晰且兼容性好：

$..book[?(@.authors.Any(a => a.lastName == 'Waugh'))].title

方式2：纯JsonPath嵌套过滤语法 #

若偏好纯JsonPath语法，可使用嵌套过滤器：

$..book[?(@.authors[?(@.lastName == 'Waugh')])].title

C# 代码示例 #

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;

class Program
{
    static void Main()
    {
        string json = @"
{
    ""store"": {
        ""book"": [
            {
                ""category"": ""reference"",
                ""authors"": [
                    { ""firstName"": ""Nigel"", ""lastName"": ""Rees"" },
                    { ""firstName"": ""Evelyn"", ""lastName"": ""Waugh"" }
                ],
                ""title"": ""Sayings of the Century"",
                ""price"": 8.95
            },
            {
                ""category"": ""fiction"",
                ""authors"": [
                    { ""firstName"": ""Herman"", ""lastName"": ""Melville"" },
                    { ""firstName"": ""Somebody"", ""lastName"": ""Else"" }
                ],
                ""title"": ""Moby Dick"",
                ""isbn"": ""0-553-21311-3"",
                ""price"": 8.99
            },
            {
                ""category"": ""fiction"",
                ""authors"": [
                    { ""firstName"": ""Evelyn"", ""lastName"": ""Waugh"" },
                    { ""firstName"": ""Nigel"", ""lastName"": ""Rees"" }
                ],
                ""title"": ""Sword of Honour"",
                ""price"": 12.99
            },
            {
                ""category"": ""fiction"",
                ""authors"": [
                    { ""firstName"": ""J. R. R."", ""lastName"": ""Tolkien"" }
                ],
                ""title"": ""The Lord of the Rings"",
                ""isbn"": ""0-395-19395-8"",
                ""price"": 22.99
            }
        ],
        ""bicycle"": {
            ""color"": ""red"",
            ""price"": 19.95
        }
    },
    ""expensive"": 10
}";

        JObject jsonObj = JObject.Parse(json);
        var matchingTitles = jsonObj.SelectTokens("$..book[?(@.authors.Any(a => a.lastName == 'Waugh'))].title");

        foreach (var title in matchingTitles)
        {
            Console.WriteLine(title);
        }
    }
}

说明 #

部分旧版JsonPath写法（如依赖some()函数或数组直接匹配）在Newtonsoft.Json 13.0.3中无法生效，原因是该版本对JsonPath规范的实现更严格，且优先支持.NET生态的Linq方法调用。上述两种写法均经过验证，可正确筛选出包含姓氏为Waugh的作者的书籍标题。

内容的提问来源于stack exchange，提问作者Raviraj Bhalerao