.NET文件上传下载类

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Web;
using System.Web.UI.WebControls;
/// <summary>
/// 文件管理
/// </summary>
public class WebFile
{
    #region Fields/Attributes/Properties

    FileInfo fileInfo = null;
    HttpResponse Response = null;

    #endregion

    #region Constructor

    public WebFile(HttpResponse response)
    {
        Response = response;
    }

    #endregion

    #region Check Method

    /// <summary>
    /// 指定文件是否存在
    /// </summary>
    /// <param name="fullName">指定文件完整路径</param>
    /// <returns>存在返回true;否则返回false</returns>
    public bool IsFileExists(string fullName)
    {
        fileInfo = new FileInfo(fullName);
        if (fileInfo.Exists)
            return true;
        return false;
    }

    #endregion

    #region File Upload

    /// <summary>
    /// 上传文件
    /// </summary>
    /// <param name="postedFile">上传的文件</param>
    /// <param name="saveAsFullName">文件保存的完整路径，但不能重名</param>
    /// <returns>成功返回true;否则返回false</returns>
    public bool UploadFile(HttpPostedFile postedFile, string saveAsFullName)
    {
        return UploadFile(postedFile, saveAsFullName, false);
    }

    /// <summary>
    /// 上传文件
    /// </summary>
    /// <param name="postedFile">上传的文件</param>
    /// <param name="saveAsFullName">文件保存的完整路径</param>
    /// <param name="isReplace">如果有同名文件存在，是否覆盖</param>
    /// <returns>成功返回true,否则返回false</returns>
    public bool UploadFile(HttpPostedFile postedFile, string saveAsFullName, bool isReplace)
    {
        try
        {
            if (!isReplace && IsFileExists(saveAsFullName))
                return false;
            postedFile.SaveAs(saveAsFullName);
            return true;
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

    #endregion

    #region File Download

    /// <summary>
    /// 文件下载
    /// </summary>
    /// <param name="fullName">文件完整路径</param>
    /// <returns>下载成功返回true,否则返回false</returns>
    public bool DownloadFile(string fullName)
    {
        return DownloadFile(fullName, fullName.Substring(fullName.LastIndexOf(@"\") + 1));
    }

    /// <summary>
    /// 文件下载
    /// </summary>
    /// <param name="fullName">文件完整路径</param>
    /// <param name="sendFileName">发送到客户端显示的文件名</param>
    /// <returns>下载成功返回true,否则返回false</returns>
    public bool DownloadFile(string fullName, string sendFileName)
    {
        if (!IsFileExists(fullName))
            return false;

        try
        {
            fileInfo = new FileInfo(fullName);
            Response.Clear();
            Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(sendFileName, System.Text.Encoding.UTF8));
            Response.AddHeader("Content-Length", fileInfo.Length.ToString());
            Response.ContentType = "application/octet-stream";
            Response.WriteFile(fileInfo.FullName);
            Response.End();
            Response.Flush();
            Response.Clear();
            return true;
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

    #endregion

    #region File Delete

    /// <summary>
    /// 删除文件
    /// </summary>
    /// <param name="fullName">文件完整路径</param>
    /// <returns>删除成功返回true,否则返回false</returns>
    public bool DeleteFile(string fullName)
    {
        if (!IsFileExists(fullName))
            return false;
        try
        {
            fileInfo = new FileInfo(fullName);
            fileInfo.Delete();
            return true;
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

    #endregion

    #region File Move To

    /// <summary>
    /// 移动文件
    /// </summary>
    /// <param name="fullName">文件完整路径</param>
    /// <param name="newFullName">文件移动到的完整路径（可重新命名，但不能重名）</param>
    /// <returns>移动成功返回true,否则返回false</returns>
    public bool MoveTo(string fullName, string newFullName)
    {
        return MoveTo(fullName, newFullName, false);
    }

    /// <summary>
    /// 移动文件
    /// </summary>
    /// <param name="fullName">文件完整路径</param>
    /// <param name="newFullName">文件移动到的完整路径（可重新命名）</param>
    /// <param name="isReplace">如果有同名文件存在，是否覆盖</param>
    /// <returns>移动成功返回true,否则返回false</returns>
    public bool MoveTo(string fullName, string newFullName, bool isReplace)
    {
        if (!isReplace && IsFileExists(fullName))
            return false;
        try
        {
            fileInfo = new FileInfo(fullName);
            fileInfo.MoveTo(newFullName);
            return true;
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

    #endregion

    #region File Copy To

    /// <summary>
    /// 复制文件
    /// </summary>
    /// <param name="fullName">文件完整路径</param>
    /// <param name="newFullName">文件移动到的完整路径（可重新命名）</param>
    /// <returns>复制成功返回true,否则返回false</returns>
    public bool CopyTo(string fullName, string newFullName)
    {
        return CopyTo(fullName, newFullName, false);
    }

    /// <summary>
    /// 复制文件
    /// </summary>
    /// <param name="fullName">文件完整路径</param>
    /// <param name="newFullName">文件移动到的完整路径（可重新命名）</param>
    /// <param name="isReplace">如果有同名文件存在，是否覆盖</param>
    /// <returns>复制成功返回true,否则返回false</returns>
    public bool CopyTo(string fullName, string newFullName, bool isReplace)
    {
        if (!isReplace && IsFileExists(fullName))
            return false;
        try
        {
            fileInfo = new FileInfo(fullName);
            fileInfo.CopyTo(newFullName, false);
            return true;
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

    #endregion
}