using System;

using System.Web.UI.HtmlControls;

using System.IO;

namespace Web.Custom

{

/*

* ----------------------------------------

* 功能: 通过HtmlInputFile控件上传文件类

* 创建: 2005-09-21

* 作者: ∮明天去要饭

* 邮箱: kgidwss@hotmail.com

* ---------------------------------------

*/

/// <summary>

/// HtmlInputFileControl 的摘要说明。

/// </summary>

public class HtmlInputFileControl

{

#region HtmlInputFileControl

public HtmlInputFileControl()

{

//

// TODO: 在此处添加构造函数逻辑

//

}

#endregion

#region IsAllowedExtension

/// <summary>

/// 是否允许该扩展名上传

/// </summary>

/// <param name="hifile">HtmlInputFile控件</param>

/// <returns>允许则返回true,否则返回false</returns>

public static bool IsAllowedExtension(HtmlInputFile hifile)

{

string strOldFilePath = "",strExtension = "";

//允许上传的扩展名，可以改成从配置文件中读出

string[] arrExtension = {".gif",".jpg",".jpeg",".bmp",".png"};

if(hifile.PostedFile.FileName != string.Empty)

{

strOldFilePath = hifile.PostedFile.FileName;

//取得上传文件的扩展名

strExtension = strOldFilePath.Substring(strOldFilePath.LastIndexOf("."));

//判断该扩展名是否合法

for(int i = 0; i< arrExtension.Length; i++)

{

if(strExtension.Equals(arrExtension[i]))

{

return true;

}

}

}

return false;

}

#endregion

#region IsAllowedLength

/// <summary>

/// 判断上传文件大小是否超过最大值

/// </summary>

/// <param name="hifile">HtmlInputFile控件</param>

/// <returns>超过最大值返回false,否则返回true.</returns>

public static bool IsAllowedLength(HtmlInputFile hifile)

{

//允许上传文件大小的最大值,可以保存在xml文件中,单位为KB

int i = 20;

//如果上传文件的大小超过最大值,返回flase,否则返回true.

if(hifile.PostedFile.ContentLength > i * 1024)

{

return false;

}

return true;

}

#endregion

#region SaveFile

/// <summary>

/// 上传文件并返回文件名

/// </summary>

/// <param name="hifile">HtmlInputFile控件</param>

/// <param name="strAbsolutePath">绝对路径.如:Server.MapPath(@"Image/upload")与Server.MapPath(@"Image/upload/")均可,用/符号亦可</param>

/// <returns>返回的文件名即上传后的文件名</returns>

public static string SaveFile(HtmlInputFile hifile,string strAbsolutePath)

{

string strOldFilePath = "",strExtension = "",strNewFileName = "";

if(hifile.PostedFile.FileName != string.Empty)

{

strOldFilePath = hifile.PostedFile.FileName;

//取得上传文件的扩展名

strExtension = strOldFilePath.Substring(strOldFilePath.LastIndexOf("."));

//文件上传后的命名

strNewFileName = GetUniqueString() + strExtension;

if(strAbsolutePath.LastIndexOf("//") == strAbsolutePath.Length)

{

hifile.PostedFile.SaveAs(strAbsolutePath + strNewFileName);

}

else

{

hifile.PostedFile.SaveAs(strAbsolutePath + "//" + strNewFileName);

}

}

return strNewFileName;

}

#endregion

#region CoverFile

/// <summary>

/// 重新上传文件，删除原有文件

/// </summary>

/// <param name="ffFile">HtmlInputFile控件</param>

/// <param name="strAbsolutePath">绝对路径.如:Server.MapPath(@"Image/upload")与Server.MapPath(@"Image/upload/")均可,用/符号亦可</param>

/// <param name="strOldFileName">旧文件名</param>

public static void CoverFile(HtmlInputFile ffFile,string strAbsolutePath,string strOldFileName)

{

//获得新文件名

string strNewFileName = GetUniqueString();

if(ffFile.PostedFile.FileName != string.Empty)

{

//旧图片不为空时先删除旧图片

if(strOldFileName != string.Empty)

{

DeleteFile(strAbsolutePath,strOldFileName);

}

SaveFile(ffFile,strAbsolutePath);

}

}

#endregion

#region DeleteFile

/// <summary>

/// 删除指定文件

/// </summary>

/// <param name="strAbsolutePath">文件绝对路径</param>

/// <param name="strFileName">文件名</param>

public static void DeleteFile(string strAbsolutePath, string strFileName)

{

if(strAbsolutePath.LastIndexOf("//") == strAbsolutePath.Length)

{

if(File.Exists(strAbsolutePath + strFileName))

{

File.Delete(strAbsolutePath + strFileName);

}

}

else

{

if(File.Exists(strAbsolutePath + "//" + strFileName))

{

File.Delete(strAbsolutePath + "//" + strFileName);

}

}

}

#endregion

#region GetUniqueString

/// <summary>

/// 获取一个不重复的文件名

/// </summary>

/// <returns></returns>

public static string GetUniqueString()

<font