//從文件流中讀取傳遞測參數
      using (var ms = new MemoryStream())
      {
        context.HttpContext.Request.Body.Seek(0, 0);//將讀取指針迻到開始位置
        context.HttpContext.Request.Body.CopyTo(ms);
        var b = ms.ToArray();
        var postParamsString = Encoding.UTF8.GetString(b);
      }

public class SignValidateAttribute : ActionFilterAttribute
  {
    #region
    /// <summary>
    ///
    /// </summary>
    /// <param name="context"></param>
    /// <param name="next"></param>
    /// <returns></returns>
    public async override Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
    {
      //從文件流中讀取傳遞測參數
      using (var ms = new MemoryStream())
      {
        context.HttpContext.Request.Body.Seek(0, 0);
        context.HttpContext.Request.Body.CopyTo(ms);
        var b = ms.ToArray();
        var postParamsString = Encoding.UTF8.GetString(b);
        await next();
      }
    }
 
    /// <summary>
    ///
    /// </summary>
    /// <param name="context"></param>
    /// <param name="next"></param>
    /// <returns></returns>
    public override Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
    {
      //string dataJson = GetContextJson(context.);
      return base.OnResultExecutionAsync(context, next);
    }
    #endregion
 
  }