These days I received a small project of file management query system and trampled through the pit.

In fact, the functions are very simple, roughly requiring customers to have many pdf documents, in order to facilitate management, all to develop a file management system equivalent to, I happen to have a ready-made file management system, can be modified. Among them, customers require pdf to be placed in other disc characters, not with the application, which is very convenient to solve. After the system is online, because the customer's pdf is distributed by directory, if hundreds of virtual directories are created manually, it will be a bit cumbersome. So code implementation is needed. The records are as follows:

　　　　　/// <summary>
        /// Create virtual directories
        /// </summary>
        /// <param name="hostName">host name or website access IP address 127.0.0.1</param>
        /// <param name="vDirName">Name of virtual directory to be created </param>
        /// <param name="mappingPath">mapping address</param>
        /// <param name="website ID">website application ID</param>
        public static void CreateVDir(string websiteID, string vDirName, string mappingPath, string hostName = "127.0.0.1")
        {
            /*
             Errors are reported when created: System. Unauthorized Access Exception: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED) 
　　　　　　　　Online search is due to permission issues
             The solution is to change the default application pool in IIS - > Advanced Settings - > Identity to Local System.             
             */

            // Is there a virtual directory that needs to be created in iis, true: false: non-existent
            var hasVdirName = false;
            try
            {
                // IIS://127.0.0.1/W3SVC/10/ROOT
                string path = string.Format("IIS://{0}/W3SVC/{1}/ROOT", hostName, websiteID);
                DirectoryEntry rootfolder = new DirectoryEntry(path);

                // Loop through to determine if the virtual directory you need to create exists on the iis website
                foreach (System.DirectoryServices.DirectoryEntry v in rootfolder.Children)
                {
                    if (v.Name == vDirName)
                    {
                        hasVdirName = true;
                        break;
                    }
                }

                // If it exists, it does not need to be created
                if (hasVdirName) return;

                // Join set
                DirectoryEntry newVirDir = rootfolder.Children.Add(vDirName, rootfolder.SchemaClassName);

                // Specify the actual directory for virtual directory mapping
                newVirDir.Properties["Path"][0] = mappingPath;

                // Submit changes
                newVirDir.CommitChanges();

                // Submit changes
                rootfolder.CommitChanges();
                newVirDir.Close();
                rootfolder.Close();
                rootfolder.Dispose();
                newVirDir.Dispose();
            }
            catch (Exception ex)
            {
               // Error log processing
            }
        }