asp.net – 输出缓存使用BOTH varybyparam和varybycustom

但是当查询字符串为空时,缓存元素似乎都不起作用 – 该页面就是最后一个选定组的版本.我的缓存指令如下所示：

<%@ OutputCache Duration="300" VaryByCustom="currentAtomId" VaryByParam="documentId;folderId;sectionId;renderMode;typeId" %>

我的varyByCustom代码如下所示：

public override string GetVaryByCustomString(HttpContext context,string custom)
{
    switch (custom)
    {
        case "currentAtomId":
            var currentAtomId = SecurityManifold.Create().CurrentAtomId;

            var returnString = currentAtomId == null ? Guid.NewGuid().ToString() : currentAtomId.ToString();

            return returnString;

        default:
            throw new ArgumentException(string.Format("Argument '{0}' is not a valid cache argument.",custom));
    }
}

对CurrentAtomId的调用归结为：

public static int? GetCurrentAtomIdFromContext(HttpContext context)
{
    int entityId;

    if (context.Session == null)
    {
        throw new InvalidOperationException("Session is null");
    }

    var sessionEntityId = context.Session["CurrentEntityId"];

    if (sessionEntityId == null || string.IsNullOrEmpty(sessionEntityId.ToString()))
    {
        return null;
    }

    if (!int.TryParse(sessionEntityId.ToString(),out entityId))
    {
        return null;
    }

    return entityId;
}

最后,指定CurrentEntityId的代码是这样的：

var selectedEntityId = this.lstSecurityEntities.SelectedValue;

    if (string.IsNullOrEmpty(selectedEntityId))
    {
        return;
    }

    Session["CurrentEntityId"] = selectedEntityId;

    var possibleQueryString = Request.QueryString.ToString();

    if (!string.IsNullOrEmpty(possibleQueryString))
    {
        possibleQueryString = "?" + possibleQueryString;
    }

    Response.Redirect("default.aspx" + possibleQueryString);

我很困惑.任何想法将不胜感激.