JsonSerializer.Serialize优化，重用 JsonSerializerOptions 实例

文章参考自微软官方文档

地址：https://docs.microsoft.com/zh-cn/dotnet/standard/serialization/system-text-json-configure-options?pivots=dotnet-6-0

测试代码

using System.Diagnostics;
using System.Text.Json;

static void Serialize(Forecast forecast, JsonSerializerOptions? options = null)
{
    _ = JsonSerializer.Serialize(
        forecast,
        options ?? new JsonSerializerOptions() { WriteIndented = true });
}

Forecast forecast = new(DateTime.Now, 40, "Hot");
JsonSerializerOptions options = new() { WriteIndented = true };
int iterations = 1000;

var watch = Stopwatch.StartNew();
for (var i = 0; i < iterations; i++)
{
    Serialize(forecast, options);
}

watch.Stop();
Console.WriteLine($"重复使用一个选项实例的运行时间：{watch.ElapsedMilliseconds}");

watch = Stopwatch.StartNew();
for (int i = 0; i < iterations; i++)
{
    Serialize(forecast);
}

watch.Stop();
Console.WriteLine($"创建新选项实例所用的时间：{watch.ElapsedMilliseconds}");

public record Forecast(DateTime Date, int TemperatureC, string Summary);

食用方法：NET6新建一个控制台项目 粘贴进去

结论

不要在每次使用时都创建新的 JsonSerializerOptions 实例。 对每个调用重复使用同一实例。