ashx获取请求体

public void ProcessRequest(HttpContext context)
{
    context.Response.ContentType = "text/plain";
    try
    {
        string action = context.Request.QueryString["action"];
        if (!string.IsNullOrEmpty(action))
        {
            switch (action)
            {
                case "RPA":
                    HandleRPA(context);
                    break;
                case "17track":
                    Handle17track(context);
                    break;
                case "51track":
                    Handle51track(context);
                    break;
                // 添加更多接口逻辑以处理其他操作参数
                default:
                    context.Response.StatusCode = 400; // Bad Request
                    context.Response.Write("Invalid action");
                    break;
            }
        }
        else
        {
            context.Response.StatusCode = 500;
            context.Response.Write("Action parameter missing");
            ExceptionlessManager.WriteExceptionLog("Service_TrackingMore", "Action parameter missing", null, AllProjectsKey.OrderDownLoad.ToString());
        }
    }
    catch (Exception ex)
    {
        ExceptionlessManager.WriteExceptionLog("Service_TrackingMore", $"异常：{ex}", null, AllProjectsKey.OrderDownLoad.ToString());
        context.Response.Write($"异常：{ex}");
    }
}