如何在jsonConverter中注入/访问httpContext?

你可以注入服务 IHttpContextAccessor 转换程序的构造函数。

如下所示:

public class MyJsonConverter : JsonConverter
{
    private readonly IHttpContextAccessor httpContextAccessor;

    public MyJsonConverter(IHttpContextAccessor httpContextAccessor)
    {
        this.httpContextAccessor = httpContextAccessor;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        var context = httpContextAccessor.HttpContext;

        //...
    }

    //...
}

然后你可以通过 HttpContextAccessor 在中注册转换器时的服务 ConfigureServices 在内部 启动.cs

var httpContextAccessor = new HttpContextAccessor();
services.AddSingleton<IHttpContextAccessor>(httpContextAccessor);
services.AddJsonOptions(options => {
    options.SerializerSettings.Converters.Add(new MyJsonConverter(httpContextAccessor));
});

请注意,您不应尝试访问 HttpContext 在转换器的构造函数中。在写入或读取方法中访问它,因为在已经填充了上下文的请求期间很可能会调用该方法。