在對非常高吞吐量的應用程序進行性能測試期間，我們發現 JSON.NET 的ContractResolver. 不幸的是，當您指定一個時ContractResolver，性能似乎變得難以忍受，包括DefaultContractResolver尋求其他專家的建議，以獲取有關如何獲得性能而不鎖定 CPU 并占用不合理時間的任何建議?，F在，由于這個問題，我們看到性能下降了 87%（有任何ContractResolver定義的每秒 80 個請求，沒有ContractResolver 定義的每秒 600 個請求。測試運行的輸出是：默認解析器： Time elapsed 3736 millisecondsNoOp 解析器： Time elapsed 4150 milliseconds無解析器： Time elapsed 8 milliseconds蛇盒： Time elapsed 4753 milliseconds第三方（SnakeCase.JsonNet）： Time elapsed 3881 milliseconds
1 回答
MMTTMM
TA貢獻1869條經驗 獲得超4個贊
看起來好像ContractResolver需要反射，并且如果堅持下去就會緩存對象類型。將 存儲ContractResolver在全局范圍內會大大改變時間：
默認解析器： Time elapsed 10 milliseconds
NoOp 解析器： Time elapsed 7 milliseconds
無解析器： Time elapsed 7 milliseconds
蛇盒： Time elapsed 178 milliseconds
第三方（SnakeCase.JsonNet）： Time elapsed 10 milliseconds
更新測試代碼：
using System;
using System.Collections.Generic;
using System.Diagnostics;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using SnakeCase.JsonNet;
namespace Anonymous.Public.Namespace
{
public class Person
{
public string Name { get; set; }
public DateTime DateOfBirth { get; set; }
public bool EatsMeat { get; set; }
public decimal YearlyHouseholdIncome { get; set; }
public List<Car> CarList { get; set; }
}
public class Car
{
public string Make { get; set; }
public string Model { get; set; }
public int Year { get; set; }
}
public class NoOpNamingStrategy : NamingStrategy
{
public NoOpNamingStrategy(bool processDictionaryKeys, bool overrideSpecifiedNames)
{
base.ProcessDictionaryKeys = processDictionaryKeys;
base.OverrideSpecifiedNames = overrideSpecifiedNames;
}
public NoOpNamingStrategy(bool processDictionaryKeys, bool overrideSpecifiedNames, bool processExtensionDataNames) : this(processDictionaryKeys, overrideSpecifiedNames)
{
base.ProcessExtensionDataNames = processExtensionDataNames;
}
public NoOpNamingStrategy()
{
}
protected override string ResolvePropertyName(string name)
{
return name;
}
}
[TestClass]
public class SerializationTest
{
public static Person p { get; set; } = new Person
{
Name = "Foo Bar",
DateOfBirth = new DateTime(1970, 01, 01),
EatsMeat = true,
YearlyHouseholdIncome = 47333M,
CarList = new List<Car>
{
new Car
{
Make = "Honda",
Model = "Civic",
Year = 2019
}
}
};
public static IContractResolver Default { get; set; } = new DefaultContractResolver();
public static IContractResolver NoOp { get; set; } = new DefaultContractResolver
{
NamingStrategy = new NoOpNamingStrategy()
};
public static IContractResolver SnakeCase { get; set; } = new DefaultContractResolver
{
NamingStrategy = new SnakeCaseNamingStrategy()
};
public static IContractResolver ThirdParty { get; set; } = new SnakeCaseContractResolver();
public const int ITERATIONS = 1000;
[TestMethod]
public void TestSnakeCase()
{
var sw = new Stopwatch();
sw.Start();
for (var i = 0; i < ITERATIONS; i++)
{
var str = JsonConvert.SerializeObject(p, new JsonSerializerSettings
{
ContractResolver = SnakeCase
});
}
sw.Stop();
var elapsed = sw.ElapsedMilliseconds;
Debug.WriteLine($"Time elapsed {elapsed} milliseconds");
}
[TestMethod]
public void TestNoResolver()
{
var sw = new Stopwatch();
sw.Start();
for (var i = 0; i < ITERATIONS; i++)
{
var str = JsonConvert.SerializeObject(p);
}
sw.Stop();
var elapsed = sw.ElapsedMilliseconds;
Debug.WriteLine($"Time elapsed {elapsed} milliseconds");
}
[TestMethod]
public void TestDefaultResolver()
{
var sw = new Stopwatch();
sw.Start();
for (var i = 0; i < ITERATIONS; i++)
{
var str = JsonConvert.SerializeObject(p, new JsonSerializerSettings
{
ContractResolver = Default
});
}
sw.Stop();
var elapsed = sw.ElapsedMilliseconds;
Debug.WriteLine($"Time elapsed {elapsed} milliseconds");
}
[TestMethod]
public void TestThirdPartySnakeResolver()
{
var sw = new Stopwatch();
sw.Start();
for (var i = 0; i < ITERATIONS; i++)
{
var str = JsonConvert.SerializeObject(p, new JsonSerializerSettings
{
ContractResolver = ThirdParty
});
}
sw.Stop();
var elapsed = sw.ElapsedMilliseconds;
Debug.WriteLine($"Time elapsed {elapsed} milliseconds");
}
[TestMethod]
public void TestNoOpResolver()
{
var sw = new Stopwatch();
sw.Start();
for (var i = 0; i < ITERATIONS; i++)
{
var str = JsonConvert.SerializeObject(p, new JsonSerializerSettings
{
ContractResolver = NoOp
});
}
sw.Stop();
var elapsed = sw.ElapsedMilliseconds;
Debug.WriteLine($"Time elapsed {elapsed} milliseconds");
}
}
}
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