C# 在视图中使用HTML.action时出现MVC HTML压缩筛选器异常

代码取自

当在主视图中使用Html.action呈现局部视图时，它会在response.Filter上为我提供值不能为null的异常

滤器 看法 例外情况 Response.Filter=值不能为null

当我注释掉时，过滤器工作

@Html.Action("GetAccountCompanies", "Account")

---

为每个操作调用CompressAttribute，因此我们需要确保不压缩childactions，（response.filter==null）

<div>
   @Html.Action("GetAccountCompanies", "Account")
</div>

[HttpGet]
[ChildActionOnly]
public PartialViewResult GetAccountCompanies()
{
     return PartialView("~/Views/Shared/_AccountCompanies.cshtml");
}

response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);

@Html.Action("GetAccountCompanies", "Account")

public class CompressAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var response = filterContext.HttpContext.Response;

        if (response.Filter != null)
        {
            var encodingsAccepted = filterContext.HttpContext.Request.Headers["Accept-Encoding"];
            if (string.IsNullOrEmpty(encodingsAccepted)) return;

            encodingsAccepted = encodingsAccepted.ToLowerInvariant();

            if (encodingsAccepted.Contains("deflate"))
            {
                response.AppendHeader("Content-encoding", "deflate");
                response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
            }
            else if (encodingsAccepted.Contains("gzip"))
            {
                response.AppendHeader("Content-encoding", "gzip");
                response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
            }
        }
    }
}