这个问题似乎是没有页面上下文建立,因此调用RenderControl()在Sublayout的GetCacheKey()方法中抛出一个空引用错误.

有人意识到以编程方式渲染Sublayout或XSLT渲染的方法吗？

这是我到目前为止

private string GetPlaceholderContent(Item item,string placeHolder)
{
    StringWriter sw = new StringWriter();
    using (HtmlTextWriter writer = new HtmlTextWriter(sw))
    {
        foreach (RenderingReference renderingReference in item.Visualization.GetRenderings(Sitecore.Context.Device,false))
        {
            if (renderingReference.Placeholder == placeHolder)
            {
                // This ensures we're only dealing with Sublayouts
                if (renderingReference.RenderingItem.InnerItem.IsOfType(Sitecore.TemplateIDs.Sublayout))
                {
                    var control = renderingReference.GetControl();
                    control.RenderControl(writer); // Throws null reference error in GetCacheKey()
                }
            }
        }
    }
 
    return sw.ToString();
}