简单的问题，大家进来看看.

Question

我想把上传文件的名字以上传时间重新命名。下面是我的上传时代吗。我是菜鸟，请高手指教！
private void Button1_Click(object sender, System.EventArgs e)
{
string path = Path.Combine(Server.MapPath("."),"UploadFile");

//StringBuilder sb = new StringBuilder();

UpLoadHelper uh = new UpLoadHelper();
UpLoadFile file = uh.GetUploadFile("file1");
if(file!=null)
{
file.SaveAs(Path.Combine(path,Path.GetFileName(file.FileName)));

}
}

Answer 1

HttpPostedFile postedFile = files[iFile];
fileoldname = System.IO.Path.GetFileName(postedFile.FileName);
tempfilename=DateTime.Now.Year.ToString()+DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() +DateTime.Now.Minute.ToString()+DateTime.Now.Second.ToString();
tempfilename=tempfilename+r.Next(10000);  //随机产生新的文件主名
if (fileoldname != "")
{
fileExtension = System.IO.Path.GetExtension(fileoldname).ToLower();         //取得上传文件的扩展名
fullfilename=fullpath +"\\" + tempfilename + fileExtension; //保存文件的新文件全名
filenewname=tempfilename + fileExtension; //产生新文件名 if(uploadType.IndexOf(fileExtension)==-1)                                   //判断文件类型
{
Response.Write("<script>alert('对不起，你要上传的文件不在许可的类型范围内！');history.back();</script>");
Response.End();
}
else
{
if(postedFile.ContentLength>maxFileSize)  //判断上传文件的大小
{
Response.Write("<script>alert('对不起，文件超过限定大小！');history.back();</script>");
Response.End();
}
else
{ //上传文件
postedFile.SaveAs(fullfilename);

}
}
}

Answer 2

string LFileName="",LFileFolder=Request.PhysicalApplicationPath+"uploadfiles\\metting\\";
int pos=FFileName.IndexOf(".");
//按照当前的时间给文件命名
LFileName=Session["User_id"]+DateTime.Now.Year.ToString()
+DateTime.Now.Month.ToString()
+DateTime.Now.Day.ToString()
+DateTime.Now.Hour.ToString()
+DateTime.Now.Minute.ToString()
+DateTime.Now.Second.ToString()
+Path.GetExtension(up_file.PostedFile.FileName);
//判断上传目录是否存在，不存在就建立 
if (!File.Exists(LFileFolder))
{
  　            Directory.CreateDirectory(LFileFolder);
}
//下面的代码是上传文件到服务器 
up_file.PostedFile.SaveAs(LFileFolder+LFileName);

Answer 3

我这样改，可文件的扩展名没有呀，怎么加上扩展名？
string tempfilename=DateTime.Now.Year.ToString()+DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() +DateTime.Now.Minute.ToString()+DateTime.Now.Second.ToStrin();
 //tempfilename=tempfilename+r.Next(10000);
 file.SaveAs(Path.Combine(path,Path.GetFileName(tempfilename)));

Answer 4

string LFileName="",LFileFolder=Request.PhysicalApplicationPath+"uploadfiles\\metting\\";
int pos=FFileName.IndexOf(".");
//按照当前的时间给文件命名
LFileName=Session["User_id"]+DateTime.Now.Year.ToString()
+DateTime.Now.Month.ToString()
+DateTime.Now.Day.ToString()
+DateTime.Now.Hour.ToString()
+DateTime.Now.Minute.ToString()
+DateTime.Now.Second.ToString()
+Path.GetExtension(up_file.PostedFile.FileName);
//判断上传目录是否存在，不存在就建立 
if (!File.Exists(LFileFolder))
{
  　            Directory.CreateDirectory(LFileFolder);
}
//下面的代码是上传文件到服务器 
up_file.PostedFile.SaveAs(LFileFolder+LFileName);

Answer 5

参考下面    
if (File1.PostedFile.ContentLength>0)
                    {
                        string postPathName=File1.PostedFile.FileName;
                        string postFile=System.IO.Path.GetFileName(postPathName);
                        int intI  = postFile.LastIndexOf(".");
                        string newExt  = postFile.Substring(intI);
                                                                                                                 string strImageName=DateTime.Now.Year.ToString()+ DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString()+ DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + File1.PostedFile.ContentLength.ToString() + newExt;
                        
                            try
                            {
                                File1.PostedFile.SaveAs(Server.MapPath("../../post_img_file/") + strImageName);
                                 Response.Write("<script>alert('已经上传!');document.location.href='send.aspx';</script>");
                             }