使用 DataContract 反序列化为枚举时如何优化 ServiceStack.Text 性能

Question

在将枚举值反序列化为具有 DataContract and EnumMember 属性集的 .Net 枚举时，是否有优化 ServiceStack.Text（版本 5.4.0）性能的方法？我想使用 EnumMember 属性来定义序列化名称，但不幸的是 ServiceStack.Text 似乎需要大约三倍的时间来使用此方法进行反序列化，而不是基于普通枚举成员名称进行反序列化。

例如，考虑这个简单的 C# 测试程序：

using ServiceStack;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.Serialization;
using System.Text;

namespace ServiceStackPerformance
{
    public class Program
    {
        [DataContract]
        enum DataContractEnum
        {
            [EnumMember(Value = "first")]
            First = 0,
            [EnumMember(Value = "second")]
            Second = 1,
        }

        enum PlainEnum
        {
            first = 0,
            second = 1,
        }

        [DataContract]
        class DataContractEnumList
        {
            [DataMember(Name = "values")]
            public List<DataContractEnum> Values { get; set; }
        }

        [DataContract]
        class PlainEnumList
        {
            [DataMember(Name = "values")]
            public List<PlainEnum> Values { get; set; }
        }

        static void Main(string[] args)
        {
            int size = 100000;
            string test = GenerateTestString(size);
            var stopwatch = new Stopwatch();

            stopwatch.Start();
            var dataContractEnumList = test.FromJson<DataContractEnumList>();
            var dataContractMs = stopwatch.ElapsedMilliseconds;

            stopwatch.Restart();
            var plainType = test.FromJson<PlainEnumList>();
            var plainMs = stopwatch.ElapsedMilliseconds;

            Console.WriteLine($"Deserializing input of size {2*size+1} to data contract enum took {dataContractMs} ms.");
            Console.WriteLine($"Deserializing input of size {2*size+1} to simple enum took {plainMs} ms.");
        }

        private static string GenerateTestString(int size)
        {
            var builder = new StringBuilder(10*size);
            builder.Append("{\"values\":[");
            for ( int i = 0; i < size; i++)
            {
                builder.Append("\"first\",\"second\",");
            }
            builder.Append("\"first\"]}");

            return builder.ToString();
        }
    }
}

输出如下：

Deserializing input of size 200001 to data contract enum took 3520 ms.
Deserializing input of size 200001 to simple enum took 1131 ms.

是否可以启用任何缓存或其他性能优化来避免减速？

Answer 1

使用缓存枚举信息的 this commit and deserialization of Enums in this commit 应该改进 [EnumMember] 枚举的性能。

此更改适用于现在 available on MyGet 的 v5.4.1。

使用 DataContract 反序列化为枚举时如何优化 ServiceStack.Text 性能

How to optimize ServiceStack.Text performance when deserializing to enums with DataContract

.net

datacontract

servicestack

servicestack-text