in a strange situation my page_Load Runs twice and all of my codes are in page_Load.
i can not use Page.IsPostBac because in both of Page_Loads, it is false.
but what is strange situation ?
i have a page for download files in my project,
when you click on one of download links (i used anchors, so IsPostBack is false) page_Load runs and in page load i check DownloadPath Querystring.
if DownloadPath not be null i jump to a Handler.ashx by passing that DownloadPath for showing Download Window To My Users.
during this process i have some logs in my database and because of that twice running they will be duplicate.
but when twice running accours ?
when you try to download a link by internet download manager, page_Load runs twice!
我如何防止第二次运行page_Load或有没有办法识别它？
编辑:
我的页面_Load:
namespace NiceFileExplorer.en
{
public partial class Download : System.Web.UI.Page
{
public string Folders = "";
public string Files = "";
protected void Page_Load(object sender, EventArgs e)
{
Statistics_body_inside.DataBind();
if (Request.QueryString["Path"] != null)
{
if (Request.QueryString["Path"] == "..")
{
ScriptManager.RegisterStartupScript(this.Page, typeof(Page), "YouCanNotDoThatAnyMore", "YouCanNotDoThatAnyMore();", true);
}
else
{
MainCodes();
}
}
else
{
MainCodes();
}
}
private void MainCodes()
{
if (Request.QueryString["DownloadPath"] != null)
{
string DownloadPath = Request.QueryString["DownloadPath"].ToString();
string FilePath = "C:" + DownloadPath.Replace(@"/", @"\\");
if (Session["User_ID"] != null)
{
string FileName = Request.QueryString["FileName"].ToString();
string FileSize = Request.QueryString["FileSize"].ToString();
string FileCreationDate = Request.QueryString["FileCreationDate"].ToString();
int Downloaded_Count_4Today = DataLayer.Download.Count_By_UserID_Today(int.Parse(HttpContext.Current.Session["User_ID"].ToString()), DateTime.Now);
if (Downloaded_Count_4Today <= 10)
{
DataSet dsDownload = DataLayer.Download.Size_By_UserID_Today(int.Parse(HttpContext.Current.Session["User_ID"].ToString()), DateTime.Now);
if (dsDownload.Tables["Download"].Rows.Count > 0)
{
DataRow drDownload = dsDownload.Tables["Download"].Rows[0];
int SumOfFileSize4Today = int.Parse(drDownload["FileSizSum"].ToString());
if (SumOfFileSize4Today + int.Parse(FileSize) <= 1073741824)//1 GB = 1024*1024*1024 bytes = 1073741824 bytes
//if (SumOfFileSize4Today + int.Parse(FileSize) <= 100000)
{
//DataLayer.Download.InsertRow(
// int.Parse(Session["User_ID"].ToString()),
// DateTime.Now,
// FilePath.Replace(@"\\", @"\"),
// FileName,
// FileSize,
// DateTime.Parse(FileCreationDate)
// );
Response.Redirect("~/HandlerForMyFE.ashx?Downloadpath=" + HttpUtility.UrlEncode(DownloadPath));
}
else
{
ScriptManager.RegisterStartupScript(this.Page, typeof(Page), "YouCanNotDownloadAnyMore_SizeOverload", "YouCanNotDownloadAnyMore_SizeOverload();", true);
}
}
else
{
if (int.Parse(FileSize) <= 1073741824)
//if (int.Parse(FileSize) <= 100000)
{
//DataLayer.Download.InsertRow(
// int.Parse(Session["User_ID"].ToString()),
// DateTime.Now,
// FilePath.Replace(@"\\", @"\"),
// FileName,
// FileSize,
// DateTime.Parse(FileCreationDate)
// );
Response.Redirect("~/HandlerForMyFE.ashx?Downloadpath=" + HttpUtility.UrlEncode(DownloadPath));
}
else
{
ScriptManager.RegisterStartupScript(this.Page, typeof(Page), "YouCanNotDownloadAnyMore_SizeOverload", "YouCanNotDownloadAnyMore_SizeOverload();", true);
}
}
}
else
{
ScriptManager.RegisterStartupScript(this.Page, typeof(Page), "YouCanNotDownloadAnyMore_CountOverload", "YouCanNotDownloadAnyMore_CountOverload();", true);
}
}
else
{
ScriptManager.RegisterStartupScript(this.Page, typeof(Page), "plzLoginFirst_ForDownload", "plzLoginFirst_ForDownload();", true);
}
}
DirectoryInfo dir;
string lastpath = "";
try
{
lastpath = Request["path"].ToString();
}
catch { }
lblTitleInHeader.Text = "Files";
lblTitleInHeader.Text += lastpath;
//set back
string[] splited = lblTitleInHeader.Text.Split('/');
lblTitleInHeader.Text = "";
ArrayList arName = new ArrayList();
for (int i = 0; i < splited.Length; i++)
{
if (splited[i] != "")
{
arName.Add(splited[i]);
}
}
for (int i = 0; i < arName.Count - 1; i++)
{
if (i != arName.Count - 1)
{
lblTitleInHeader.Text += "" + arName[i] + "" + " " + "
";
}
}
lblTitleInHeader.Text += arName[arName.Count - 1].ToString();
lblTitleInHeader.Text = lblTitleInHeader.Text.Replace("/'>", "'>");
if (lastpath != "")
{
//dir = new DirectoryInfo(Server.MapPath("~/Files/" + lastpath));
dir = new DirectoryInfo(@"C:\\Files\\" + lastpath.Replace(@"/", @"\\"));
}
else
{
//dir = new DirectoryInfo(Server.MapPath("~/Files/"));
dir = new DirectoryInfo(@"C:\\Files\\");
}
int count4Folders = 0;
foreach (DirectoryInfo d in dir.GetDirectories())
{
count4Folders++;
DirectoryInfo dirSub = new DirectoryInfo(d.FullName);
int iDir = 0;
int iFile = 0;
foreach (DirectoryInfo subd in dirSub.GetDirectories())
{
iDir++;
}
foreach (FileInfo f in dirSub.GetFiles("*.*"))
{
iFile++;
}
Folders += "";
Folders += "";
Folders += " ";
Folders += "";
Folders += "";
Folders += "
";
Folders += "";
Folders += d.Name;
Folders += "";
Folders += "";
Folders += "";
Folders += iDir.ToString() + " Folders & " + iFile.ToString() + " Files";
Folders += "";
Folders += "";
Folders += " ";
Folders += "";
Folders += "";
}
if (count4Folders == 0)
{
divFoldersHeader.Style.Add("display", "none");
}
int count4Files = 0;
foreach (FileInfo f in dir.GetFiles("*.*"))
{
count4Files++;
Files += "";
Files += "";
Files += " ";
Files += "";
Files += "";
char[] Extension_ChAr = f.Extension.ToCharArray();
string Extension_str = string.Empty;
int lenghth = Extension_ChAr.Length;
for (int i = 1; i < Extension_ChAr.Length; i++)
{
Extension_str += Extension_ChAr[i];
}
if (Extension_str.ToLower() == "rar" || Extension_str.ToLower() == "zip" || Extension_str.ToLower() == "zipx" || Extension_str.ToLower() == "7z" || Extension_str.ToLower() == "cat")
{
Files += "
";
}
else if (Extension_str.ToLower() == "txt" || Extension_str.ToLower() == "doc" || Extension_str.ToLower() == "docx")
{
Files += "
";
}
else if (Extension_str.ToLower() == "pdf")
{
Files += "
";
}
else if (Extension_str.ToLower() == "jpg" || (Extension_str.ToLower() == "png") || (Extension_str.ToLower() == "gif") || (Extension_str.ToLower() == "bmp") || (Extension_str.ToLower() == "psd"))
{
Files += "
";
}
else if (Extension_str.ToLower() == "exe")
{
Files += "
";
}
else
{
Files += "
";
}
Files += "";
Files += f.Name;
Files += "";
Files += "";
Files += "";
Files += "" + Extension_str.ToUpper() + "" + " File";
//Files += Path.GetExtension(f.Name) + " File";
Files += "";
Files += "";
Files += ConvertBytes.ToFileSize(long.Parse(f.Length.ToString()));
Files += "";
Files += "";
Files += f.CreationTime;
Files += "";
Files += "";
string Downloadpath = "/Files" + lastpath + "/" + f.Name;
string EncodedDownloadpath = HttpUtility.UrlEncode(Downloadpath);
Files += "";
Files += "
";
Files += "";
Files += "";
Files += "";
Files += " ";
Files += "";
Files += "";
}
if (count4Files == 0)
{
divFilesHeader.Style.Add("display", "none");
}
if ((count4Folders == 0) && (count4Files == 0))
{
divFoldersHeader.Style.Add("display", "block");
divFilesHeader.Style.Add("display", "block");
}
ScriptManager.RegisterStartupScript(this, this.GetType(), "hash", "location.hash = '#BreadCrumbInDownload';", true);
}
....
我的aspx:
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