Newtonsoft.Json/Linq/JsonPath/FieldFilter.cs

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using System.Collections.Generic;
using System.Globalization;
using Newtonsoft.Json.Utilities;

namespace Newtonsoft.Json.Linq.JsonPath
{
    internal class FieldFilter : PathFilter
    {
        public string Name { get; set; }

        public override IEnumerable<JToken> ExecuteFilter(IEnumerable<JToken> current, bool errorWhenNoMatch)
        {
            foreach (JToken t in current)
            {
                JObject o = t as JObject;
                if (o != null)
                {
                    if (Name != null)
                    {
                        JToken v = o[Name];

                        if (v != null)
                            yield return v;
                        else if (errorWhenNoMatch)
                            throw new JsonException("Property '{0}' does not exist on JObject.".FormatWith(CultureInfo.InvariantCulture, Name));
                    }
                    else
                    {
                        foreach (KeyValuePair<string, JToken> p in o)
                        {
                            yield return p.Value;
                        }
                    }
                }
                else
                {
                    if (errorWhenNoMatch)
                        throw new JsonException("Property '{0}' not valid on {1}.".FormatWith(CultureInfo.InvariantCulture, Name ?? "*", t.GetType().Name));
                }
            }
        }
    }
}