ASP.NET Core 3 中是否有使用蛇形命名法作为 JSON 命名策略的内置方法？

我设法使用以下代码让它工作：

.AddNewtonsoftJson(options => {
    options.SerializerSettings.ContractResolver = new DefaultContractResolver
    {
        NamingStrategy = new SnakeCaseNamingStrategy()
    };
});

然而这使得 MVC 使用Newtonsoft而不是System.Text.JSON它更快、异步且内置。

查看命名策略选项System.Text.JSON我只能找到驼峰命名法。是否有对蛇案的本地支持？实现蛇形 JSON 命名风格的更好方法是什么？

Update

.Net 8 已经发布，并且内置了对不同命名的支持policies https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/customize-properties?pivots=dotnet-8-0#customize-individual-property-names.

var serializeOptions = new JsonSerializerOptions
{
    // This can be changed to other naming policies like SnakeCaseLower, KebabCaseLower
    PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
    WriteIndented = true
};
jsonString = JsonSerializer.Serialize(weatherForecast, serializeOptions);

旧答案

只需稍加修改即可pfx删除依赖的代码Newtonsoft Json.Net.

String将给定字符串转换为的扩展方法SnakeCase.

public static class StringUtils
{
    public static string ToSnakeCase(this string str)
    {
        return string.Concat(str.Select((x, i) => i > 0 && char.IsUpper(x) ? "_" + x.ToString() : x.ToString())).ToLower();
    }
}

然后在我们的SnakeCaseNamingPolicy我们可以做的

public class SnakeCaseNamingPolicy : JsonNamingPolicy
{
    public static SnakeCaseNamingPolicy Instance { get; } = new SnakeCaseNamingPolicy();

    public override string ConvertName(string name)
    {
        // Conversion to other naming convention goes here. Like SnakeCase, KebabCase etc.
        return name.ToSnakeCase();
    }
}

最后一步是在中注册我们的命名策略Startup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddControllers()            
        .AddJsonOptions(
            options => { 
                options.JsonSerializerOptions.PropertyNamingPolicy = 
                    SnakeCaseNamingPolicy.Instance;
            });
}

使用模型：

public class WeatherForecast
{
    public DateTime Date { get; set; }

    public int TemperatureCelcius { get; set; }

    public int TemperatureFahrenheit { get; set; }

    public string Summary { get; set; }
}

Json output:

{
  "date": "2019-10-28T08:26:14.878444+05:00",
  "temperature_celcius": 4,
  "temperature_fahrenheit": 0,
  "summary": "Scorching"
}