asp.net FileUpload上传文件

/// <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>

public static string UploadFile(HttpPostedFile pf,string savepath, out string filename)

{

string fileExt = GetFileExt(pf.FileName);

if (!AllowFileExt(fileExt))

{

filename = string.Empty;

return "上传文件扩展名不被允许";

}

else if (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);

return string.Empty;

}

/// <summary>

/// 新文件名

/// </summary>

/// <returns></returns>

public static string 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>

static public string 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>

static public string GetFileName(string filename)

{

int pos = filename.LastIndexOfAny(new char[] { '\\', '/' });

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>

static public bool AllowFileExt(string ext)

{

try

{

string ex = "txt,xls,doc,docx,rar,zip";

foreach (string s in ex.Split(','))

{

if (ext.ToLower() == s.ToLower())

{

return true;

}

}

}

catch { return true; }

return false;

}

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

//上传文件加入数据库

protected void Button1_Click(object sender, EventArgs e)

{

string filename = "";

string msg = Common .UploadFile(FileUpload1.PostedFile, "upload", out filename);

if ("" == msg)

{

attendInfo.AttachUrl = filename;//成功

return true;

}

else

{

Common.ShowMessage(""+msg+"");//失败

return false;

}