c# - 在功能停用时删除自定义母版页错误

Question

我有一项功能可以在激活时将自定义母版页部署到网站集中的所有网站，并希望在停用时删除自定义母版页的所有痕迹。停用时，将站点的母版页设置回 v4.master 后，尝试删除先前设置为默认的自定义母版页时会发生错误(无法删除文件“custom.master”。错误代码:158。)。该功能在错误发生后并未完全停用，但大部分文件已被删除，并且品牌已设置回 v4.master。当再次尝试停用该功能时，它会无误地删除最终文件 custom.master。

我不明白缺少什么。为什么 FeatureDeactivating() 必须先完成才能删除 custom.master？

public override void FeatureActivated(SPFeatureReceiverProperties properties)
{
    using (SPSite sitecollection = (SPSite)properties.Feature.Parent)
    {
        using (SPWeb web = sitecollection.RootWeb)
        {
            string WebAppRelativePath = sitecollection.ServerRelativeUrl;
            if (!WebAppRelativePath.EndsWith("/"))
            {
                WebAppRelativePath += "/";
            }

            foreach (SPWeb site in sitecollection.AllWebs)
            {
                site.CustomMasterUrl = WebAppRelativePath + "_catalogs/masterpage/custom.master";
                site.MasterUrl = WebAppRelativePath + "_catalogs/masterpage/custom.master";
                site.UIVersion = 4;
                site.Update();
            }
        }
    }
}

public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
{
    using (SPSite sitecollection = (SPSite)properties.Feature.Parent)
    {
        using (SPWeb web = sitecollection.RootWeb)
        {
            string WebAppRelativePath = sitecollection.ServerRelativeUrl;
            if (!WebAppRelativePath.EndsWith("/"))
            {
                WebAppRelativePath += "/";
            }

            foreach (SPWeb site in sitecollection.AllWebs)
            {
                site.CustomMasterUrl = WebAppRelativePath + "_catalogs/masterpage/v4.master";
                site.MasterUrl = WebAppRelativePath + "_catalogs/masterpage/v4.master";
                site.UIVersion = 4;
                site.Update();

                WebAppRelativePath = site.Url;
                if (!WebAppRelativePath.EndsWith("/"))
                {
                    WebAppRelativePath += "/";
                }
                SPFolder folder = web.GetFolder(site.Url + "_catalogs/masterpage/images/");
                if (folder.Exists)
                    folder.Delete();
                folder.Update();

                SPFile file = web.GetFile(site.Url + "_catalogs/masterpage/custom.css");
                if(file.Exists)
                    file.Delete();
                file.Update();

                file = web.GetFile(WebAppRelativePath + "_catalogs/masterpage/html5.master");
                if(file.Exists)
                    file.Delete();
                file.Update();

                file = web.GetFile(WebAppRelativePath + "_catalogs/masterpage/custom.master");
                if (file.Exists)
                {
                    file.Delete();  // ERROR HAPPENS HERE
                }
                file.Update();

                /*file = web.GetFile(WebAppRelativePath + "_catalogs/masterpage/minimal.master");
                if(file.Exists)
                    file.Delete();
                file = web.GetFile("/_layouts/minimal.master");
                if(file.Exists)
                    file.CopyTo(WebAppRelativePath + "_catalogs/masterpage/");

                file = web.GetFile(WebAppRelativePath + "_catalogs/masterpage/default.master");
                if(file.Exists)
                    file.Delete();
                file = web.GetFile("/_layouts/default.master");
                if(file.Exists)
                    file.CopyTo(WebAppRelativePath + "_catalogs/masterpage/");*/
            }
        }
    }
}

Answer 1

您可能需要获取对 SPWeb 的新引用并使用它来调用 SPWeb.GetFile()。

using block 中的 SPWeb 可能仍然引用 custom.master，需要刷新。