文件上传的应用

   /// <summary>

/// 上传文件

/// </summary>
/// <param name="pf">HttpPostedFile</param>
/// <param name="path">路径</param>
/// <param name="filename">输出文件名</param>
/// <returns>错误信息</returns>
publicstaticstring UploadFile(HttpPostedFile pf,string savepath, outstring filename)
{
string fileExt = GetFileExt(pf.FileName);
if (!AllowFileExt(fileExt))
{
filename = string.Empty;
return"上传文件扩展名不被允许";
}
elseif (pf.ContentLength >1048576)
{
filename = string.Empty;
return"上传文件大小不得超过1MB";
}

filename = GetNewFileName() + "." + fileExt;
string path = HttpContext.Current.Server.MapPath("~" + "/" + savepath + "/" + filename);
pf.SaveAs(path);
returnstring.Empty;
}

/// <summary>
/// 新文件名
/// </summary>
/// <returns></returns>
publicstaticstring GetNewFileName()
{
return DateTime.Now.ToString("MMddhhmmss");
}

/// <summary>
/// 取得文件扩展名
/// </summary>
/// <param name="filename">文件名</param>
/// <returns>扩展名字符串</returns>
staticpublicstring GetFileExt(string filename)
{
int pos = filename.LastIndexOf(".");
return filename.Substring(pos + 1);
}

/// <summary>
/// 取得文件名
/// </summary>
/// <param name="filename"></param>
/// <returns>主文件名字符串</returns>
staticpublicstring GetFileName(string filename)
{
int pos = filename.LastIndexOfAny(newchar[] { '\\', '/' });
int pos1 = 0;
int len = pos - pos1;
return filename.Substring(pos1 + 1, len);
}
/// <summary>
/// 允许上传的文件类型
/// </summary>
/// <param name="ext">文件类型</param>
/// <returns>是/否</returns>
staticpublicbool AllowFileExt(string ext)
{
try
{
string ex = "txt,xls,doc,docx,rar,zip";
foreach (string s in ex.Split(','))
{
if (ext.ToLower() == s.ToLower())
{
returntrue;
}
}
}
catch { returntrue; }
returnfalse;
}

<asp:FileUpload ID="FileUpload1" runat="server" CssClass="fileupload" />

//上传文件加入数据库

protectedvoid Button1_Click(object sender, EventArgs e)
{
string filename = "";
string msg = Common .UploadFile(FileUpload1.PostedFile, "upload", out filename);
if ("" == msg)
{
attendInfo.AttachUrl = filename;//成功
returntrue;
}
else
{
Common.ShowMessage(""+msg+"");//失败
returnfalse;
}