在实现IEnumerable的类上序列化自定义属性

目前，JSON.NET忽略了实现IEnumerable的类的所有其他属性并序列化了数组。

如何告诉JSON.NET序列化自定义属性？ 我正在尝试序列化下面的PagedList实现：

 public interface IPagedList : IEnumerable { int PageIndex { get; } int PageSize { get; } int TotalCount { get; } int TotalPages { get; } bool HasPreviousPage { get; } bool HasNextPage { get; } } public interface IPagedList : IPagedList, IList { } /// 
 /// A tried and tested PagedList implementation /// 
 public class PagedList : List, IPagedList { public PagedList(IEnumerable source, int pageIndex, int pageSize) : this(source.GetPage(pageIndex, pageSize), pageIndex, pageSize, source.Count()) { } public PagedList(IEnumerable source, int pageIndex, int pageSize, int totalCount) { Ensure.Argument.NotNull(source, "source"); this.TotalCount = totalCount; this.TotalPages = totalCount / pageSize; if (totalCount % pageSize > 0) TotalPages++; this.PageSize = pageSize; this.PageIndex = pageIndex; this.AddRange(source.ToList()); } public int PageIndex { get; private set; } public int PageSize { get; private set; } public int TotalCount { get; private set; } public int TotalPages { get; private set; } public bool HasPreviousPage { get { return (PageIndex > 0); } } public bool HasNextPage { get { return (PageIndex + 1 < TotalPages); } } } 

Answer 1

我有同样的问题，最后不得不使用自定义转换器来做到这一点。 我的转换器采用一个类型名称列表来操作，而不是全局工作。 我上了你的课，编写了一个小型控制台应用程序，它将通过转换器运行你的类。 神奇的是在JsonSerializerSettings的设置中使用EnumerableConverter类。 完成设置后，必须使用SerializeObject调用中的settings对象。

 using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Text; using Newtonsoft.Json; namespace ConsoleApplication2 { class Program { static void Main(string[] args) { var pagedList = new PagedList( new MyObject[] { new MyObject { Foo = "Bar" }, new MyObject { Foo = "Baz" } }, 0, 2, 2); Debug.WriteLine(JsonConvert.SerializeObject(pagedList)); // Outputs: [{"Foo":"Bar"},{"Foo":"Baz"}] var settings = new JsonSerializerSettings { Converters = new List( new[]{ new EnumerableConverter( new []{"ConsoleApplication2.PagedList"}, false) }) }; Debug.WriteLine(JsonConvert.SerializeObject(pagedList, settings)); // Outputs: //{ // "PageIndex":0, // "PageSize":2, // "TotalCount":2, // "TotalPages":1, // "HasPreviousPage":false, // "HasNextPage":false, // "Capacity":4, // "Count":2, // "Items":[ // { // "Foo":"Bar" // }, // { // "Foo":"Baz" // } // ] //} } } public class MyObject { public string Foo { get; set; } } public interface IPagedList : IEnumerable { int PageIndex { get; } int PageSize { get; } int TotalCount { get; } int TotalPages { get; } bool HasPreviousPage { get; } bool HasNextPage { get; } } public interface IPagedList : IPagedList, IList { } /// 
 /// A tried and tested PagedList implementation /// 
 public class PagedList : List, IPagedList { //public PagedList(IEnumerable source, int pageIndex, int pageSize) : // this(source.GetPage(pageIndex, pageSize), pageIndex, pageSize, source.Count()) { } public PagedList(IEnumerable source, int pageIndex, int pageSize, int totalCount) { //Ensure.Argument.NotNull(source, "source"); this.TotalCount = totalCount; this.TotalPages = totalCount / pageSize; if (totalCount % pageSize > 0) TotalPages++; this.PageSize = pageSize; this.PageIndex = pageIndex; this.AddRange(source.ToList()); } public int PageIndex { get; private set; } public int PageSize { get; private set; } public int TotalCount { get; private set; } public int TotalPages { get; private set; } public bool HasPreviousPage { get { return (PageIndex > 0); } } public bool HasNextPage { get { return (PageIndex + 1 < TotalPages); } } } public class EnumerableConverter : Newtonsoft.Json.JsonConverter { private IEnumerable Types { get; set; } private bool IsCamelCase { get; set; } public EnumerableConverter(IEnumerable types) : this(types, true) { } public EnumerableConverter(IEnumerable types, bool isCamelCase) { if (types == null) throw new ArgumentNullException("types"); Types = types; IsCamelCase = isCamelCase; } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { writer.WriteStartObject(); var foundInnerEnumerable = false; foreach (var property in value.GetType().GetProperties()) { try { var propVal = property.GetValue(value, null); foundInnerEnumerable |= propVal is IEnumerable; writer.WritePropertyName(NameFor(property.Name)); serializer.Serialize(writer, propVal); } catch (System.Reflection.TargetParameterCountException) { // Ignore properties such as Item on List } } if (!foundInnerEnumerable) { writer.WritePropertyName(NameFor("Items")); writer.WriteStartArray(); foreach (var item in (IEnumerable)value) { serializer.Serialize(writer, item); } writer.WriteEndArray(); } writer.WriteEndObject(); } private string NameFor(string value) { if (!IsCamelCase) return value; return value[0].ToString().ToLowerInvariant() + value.Substring(1); } public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) { throw new NotImplementedException(); } public override bool CanConvert(Type objectType) { return Types.Any(t => objectType.FullName.StartsWith(t)); } } }