Question

在将枚举值反序列化为设置了DataContract和EnumMember属性的.Net枚举时，是否有一种方法可以优化ServiceStack.Text（版本5.4.0）性能？我想使用EnumMember属性定义序列化的名称，但是不幸的是，与基于普通枚举成员名称的反序列化相比，ServiceStack.Text似乎需要大约三倍的时间才能使用此方法进行反序列化。

例如，考虑以下简单的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.

我可以启用任何缓存或其他性能优化来避免速度减慢吗？

Answer 1

使用this commit可以改善使用[EnumMember]的枚举的性能，并可以利用缓存的枚举信息对this commit中的枚举进行反序列化。

此更改可从v5.4.1（现在为available on MyGet）中获得。

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

1 个答案: