很不错的asp.net文件上传类c# 搜索文件 移动文件 删除文件等

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.IO;


namespace Tool
{
    /// <summary>
    /// file operate class
    /// </summary>
    public class FileUpload
    {
        /// <summary>
        /// Upload file
        /// </summary>
        /// <param name="path">The path of folder you want to put the file</param>
        /// <param name="UpFile">A entity of class HtmlInputFile</param>
        /// <param name="docType">Allowed file type eg:'PNG,JPG,TIF,GIF,BMP'</param>
        /// <returns>Result of upload</returns>
        //public  string Upload(string path,System.Web.UI.HtmlControls.HtmlInputFile UpFile,string docType)
        public string Upload(string path, System.Web.UI.WebControls.FileUpload UpFile, string docType)
        {
            string modifyFileName = DateTime.Now.Year.ToString();
            modifyFileName += DateTime.Now.Month.ToString();
            modifyFileName += DateTime.Now.Day.ToString();
            modifyFileName += DateTime.Now.Hour.ToString();
            modifyFileName += DateTime.Now.Minute.ToString();
            modifyFileName += DateTime.Now.Second.ToString();
            modifyFileName += DateTime.Now.Millisecond.ToString();
            string value = UpFile.FileName;
            string tFileType = value.Substring(value.LastIndexOf(".") + 1);
            string[] allowedType = docType.Split(',');
            bool TypeMatched = false;
            if (value == "" || value == null)
            {
                return "-1";             //Error:Uploaded file is null!
            }
            else
            {
                int FileLength = UpFile.PostedFile.ContentLength;
                if (FileLength > (20 * 1024 * 1024))
                {
                    return "-2";        //Error:Uploaded file is too large!
                }
                foreach (string type in allowedType)
                {
                    if (type.ToLower().IndexOf(tFileType) != -1)
                    {
                        TypeMatched = true;
                    }
                }
                if (!TypeMatched)
                {
                    return "-3"; //Error:Wrong type of Uploaded file!
                }
                string dirPath = System.Web.HttpContext.Current.Server.MapPath(path);
                System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(dirPath);
                if (!dir.Exists)
                {
                    dir.Create();
                }
                path = path + modifyFileName + "." + tFileType;
                UpFile.PostedFile.SaveAs(System.Web.HttpContext.Current.Server.MapPath(path));
                return System.Web.HttpContext.Current.Server.MapPath(path);     //Upload succeed!
            }
        }

        /// <summary>
        /// Search a file from the mapped path 
        /// </summary>
        /// <param name="path">The mappsed path</param>
        /// <param name="fileName">The file name for search</param>
        /// <returns>Result of search</returns>
        public int SearchFile(string path, string fileName)
        {
            System.IO.DirectoryInfo SearchDir = new System.IO.DirectoryInfo(System.Web.HttpContext.Current.Server.MapPath(path));
            foreach (System.IO.FileInfo File in SearchDir.GetFiles())
            {
                if (File.Name.IndexOf(fileName) != -1)
                {
                    return 1;// Find
                }
            }
            return 0;//Not find
        }

        /// <summary>
        /// Delete a file
        /// </summary>
        /// <param name="path">The path of file</param>
        /// <returns>The result of delete</returns>
        public int DeleteFile(string path)
        {
            System.IO.FileInfo File = new System.IO.FileInfo(System.Web.HttpContext.Current.Server.MapPath(path));
            if (File.Exists)
            {
                if (File.IsReadOnly)
                {
                    return -1;//The file is readonly
                }
                else
                {
                    File.Delete();
                    return 1;//Delete succeed
                }
            }
            else
            {
                return 0;//The file is not exsits
            }
        }

        /// <summary>
        /// Move a file
        /// </summary>
        /// <param name="sFolder">source folder</param>
        /// <param name="sName">source name</param>
        /// <param name="tFolder">object folder</param>
        /// <param name="tName">object name</param>
        /// <returns></returns>
        public int FileMove(string sFolder, string sName, string tFolder, string tName)
        {
            string[] arrDirs = Directory.GetDirectories(sFolder);
            string[] arrFiles = Directory.GetFiles(sFolder);

            if (arrFiles.Length != 0)
            {
                //copy this file 
                File.Copy(sFolder + "//" + sName, tFolder + "//" + tName, true);

                //delete the old file
                return DeleteFile(sFolder + "//" + sName);

            }
            else
            {
                return -1;
            }
        }

        /// <summary>
        /// Move selected files
        /// </summary>
        /// <param name="sFolder">source folder</param>
        /// <param name="tFolder">object folder</param>
        public void FileMove(string sFolder, string tFolder)
        {
            string[] arrDirs = Directory.GetDirectories(sFolder);
            string[] arrFiles = Directory.GetFiles(sFolder);

            if (arrFiles.Length != 0)
            {

                for (int i = 0; i < arrFiles.Length; i++)
                {
                    //copy these files
                    File.Copy(sFolder + "//" + Path.GetFileName(arrFiles[i]), tFolder + "//" + Path.GetFileName(arrFiles[i]), true);

                    //delete old files
                    DeleteFile(sFolder + "//" + Path.GetFileName(arrFiles[i]));
                }
            }
        }
    }
}