问如何将上传的文件存储在文件系统中？

EN

using System;
using System.IO;
using System.Xml.Serialization;

/// <summary>
/// Class for generating storage structure and file names for document storage.
/// Copyright (c) 2008, Huagati Systems Co.,Ltd. 
/// </summary>

public class DocumentStorage
{
    private static StorageDirectory _StorageDirectory = null;

    public static string GetNewUNCPath()
    {
        string storageDirectory = GetStorageDirectory();
        if (!storageDirectory.EndsWith("\\"))
        {
            storageDirectory += "\\";
        }
        return storageDirectory + GuidEx.NewSeqGuid().ToString() + ".data";
    }

    public static void SaveDocumentInfo(string documentPath, Document documentInfo)
    {
        //the filestream object don't like NTFS streams so this is disabled for now...
        return;

        //stores a document object in a separate "docinfo" stream attached to the file it belongs to
        //XmlSerializer ser = new XmlSerializer(typeof(Document));
        //string infoStream = documentPath + ":docinfo";
        //FileStream fs = new FileStream(infoStream, FileMode.Create);
        //ser.Serialize(fs, documentInfo);
        //fs.Flush();
        //fs.Close();
    }

    private static string GetStorageDirectory()
    {
        string storageRoot = ConfigSettings.DocumentStorageRoot;
        if (!storageRoot.EndsWith("\\"))
        {
            storageRoot += "\\";
        }

        //get storage directory if not set
        if (_StorageDirectory == null)
        {
            _StorageDirectory = new StorageDirectory();
            lock (_StorageDirectory)
            {
                string path = ConfigSettings.ReadSettingString("CurrentDocumentStoragePath");
                if (path == null)
                {
                    //no storage tree created yet, create first set of subfolders
                    path = CreateStorageDirectory(storageRoot, 1);
                    _StorageDirectory.FullPath = path.Substring(storageRoot.Length);
                    ConfigSettings.WriteSettingString("CurrentDocumentStoragePath", _StorageDirectory.FullPath);
                }
                else
                {
                    _StorageDirectory.FullPath = path;
                }
            }
        }

        int fileCount = (new DirectoryInfo(storageRoot + _StorageDirectory.FullPath)).GetFiles().Length;
        if (fileCount > ConfigSettings.FolderContentLimitFiles)
        {
            //if the directory has exceeded number of files per directory, create a new one...
            lock (_StorageDirectory)
            {
                string path = GetNewStorageFolder(storageRoot + _StorageDirectory.FullPath, ConfigSettings.DocumentStorageDepth);
                _StorageDirectory.FullPath = path.Substring(storageRoot.Length);
                ConfigSettings.WriteSettingString("CurrentDocumentStoragePath", _StorageDirectory.FullPath);
            }
        }

        return storageRoot + _StorageDirectory.FullPath;
    }

    private static string GetNewStorageFolder(string currentPath, int currentDepth)
    {
        string parentFolder = currentPath.Substring(0, currentPath.LastIndexOf("\\"));
        int parentFolderFolderCount = (new DirectoryInfo(parentFolder)).GetDirectories().Length;
        if (parentFolderFolderCount < ConfigSettings.FolderContentLimitFolders)
        {
            return CreateStorageDirectory(parentFolder, currentDepth);
        }
        else
        {
            return GetNewStorageFolder(parentFolder, currentDepth - 1);
        }
    }

    private static string CreateStorageDirectory(string currentDir, int currentDepth)
    {
        string storageDirectory = null;
        string directoryName = GuidEx.NewSeqGuid().ToString();
        if (!currentDir.EndsWith("\\"))
        {
            currentDir += "\\";
        }
        Directory.CreateDirectory(currentDir + directoryName);

        if (currentDepth < ConfigSettings.DocumentStorageDepth)
        {
            storageDirectory = CreateStorageDirectory(currentDir + directoryName, currentDepth + 1);
        }
        else
        {
            storageDirectory = currentDir + directoryName;
        }
        return storageDirectory;
    }

    private class StorageDirectory
    {
        public string DirectoryName { get; set; }
        public StorageDirectory ParentDirectory { get; set; }
        public string FullPath
        {
            get
            {
                if (ParentDirectory != null)
                {
                    return ParentDirectory.FullPath + "\\" + DirectoryName;
                }
                else
                {
                    return DirectoryName;
                }
            }
            set
            {
                if (value.Contains("\\"))
                {
                    DirectoryName = value.Substring(value.LastIndexOf("\\") + 1);
                    ParentDirectory = new StorageDirectory { FullPath = value.Substring(0, value.LastIndexOf("\\")) };
                }
                else
                {
                    DirectoryName = value;
                }
            }
        }
    }
}

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