. NET prevents duplicate submissions

/** prevent pages from being refreshed to cause duplicate submission pages **/

This section is put into a public class to facilitate the use of individual pages
Private readonly string refresh_ticket_name = "__refreshticketarray";
Private readonly string hidden_field_name = "__refreshhiddenfield";
Private readonly string hidden_page_guid = "__refreshpageguid";

<summary>
True to indicate page refresh, false for normal commit
</summary>
public bool Ispagerefreshed
{
Get
{
if (IsPostBack &&!) Checkrefreshflag ())
{

return true;
}
Else
{

return false;
}
}
}

<summary>
Update identity before rendering
</summary>
<param name= "E" ></param>
protected override void OnPreRender (EventArgs e)
{
Log. Debug ("Execute OnPreRender");
Base. OnPreRender (e);
Updaterefreshflag ();
}


<summary>
Update identity, Normal commit deletes the time of the commit, and produces the current new time
</summary>
private void Updaterefreshflag ()
{

#region Cookie Mode

The registration page uniquely identifies and returns
String pageguid = Setcurpageguid ();

HttpCookie cookie = Getrefreshticket ();

if (cookie. Values.count > 0)
{
Cookies. Values.remove (PAGEGUID);
Log. Debug ("The currently purged cookie becomes:" + pageguid);
}

String submittime = DateTime.Now.ToString ("Hhmmss.fffff");
Save current commit time to hidden field
Clientscript.registerhiddenfield (Hidden_field_name, submittime);


Log. Debug ("New Time to be added: Submittime:" + submittime + "Guid:" + pageguid.tostring ());
Cookies. Values.add (Pageguid, submittime);

Log. Debug ("The number of records present in the current cookie in Updaterefreshflag is:" + cookie.) Values.count);
for (int i = 0; i < cookies. Values.count; i++)
Log. Info ("cookie[" + cookie.) Values.getkey (i) + "]:" + cookies. Values[i]);

Response.appendcookie (cookie);

#endregion

}


<summary>
Verifying whether to refresh
</summary>
<returns></returns>
private bool Checkrefreshflag ()
{
HttpCookie cookie = Getrefreshticket ();
String pageguid = Getcurpageguid ();
if (cookie. Values.count > 0)
{
BOOL Flag;
if (cookie. VALUES[PAGEGUID]! = NULL)
Flag = cookie. Values[pageguid]. IndexOf (Getcursubmittime ()) >-1;
Else
Flag = true;//Prevents exceptions and can always be submitted
if (flag)
Log. Debug ("Commit time exists, can be submitted");
Else
Log. Debug ("Invalid commit Time");
return flag;
}
return true;
}


<summary>
Get saved commit time, no new, there is return
</summary>
<returns></returns>
Private HttpCookie Getrefreshticket ()
{
#region Cookie mode, the return value is a cookie

HttpCookie cookies;
if (request.cookies[refresh_ticket_name] = = null)
{
cookie = new HttpCookie (refresh_ticket_name);
Response.appendcookie (cookie);
Log. Debug ("Cookie does not exist, initialize");
}
Else
{
cookie = Request.cookies[refresh_ticket_name];

Log. Debug ("Read the existing cookie, the number of records present in the current cookie is:" + cookie.) Values.count + "specific to the following:");

for (int i = 0; i < cookies. Values.count; i++)
Log. Info ("cookie[" + cookie.) Values.getkey (i) + "]:" + cookies. Values[i]);
}
return cookie;
#endregion
}


<summary>
Get Current commit time
</summary>
<returns></returns>
private String Getcursubmittime ()
{
String submittime = request.params[hidden_field_name] = = null? "": Request.params[hidden_field_name]. ToString ();
Log. Debug ("Execute getcursubmittime:submittime:" + submittime);
return submittime;
}


<summary>
Sets the page's unique identity, using the GUID identifier to differentiate each page's own commit time
</summary>
private String Setcurpageguid ()
{
String GUID;
if (! IsPostBack)
{
if (request.params[hidden_page_guid] = = null)
{
GUID = System.Guid.NewGuid (). ToString ();
Log. Debug ("Setcurpageguid registered a new identity:" + GUID);
}
Else
GUID = Getcurpageguid ();

}
Else
{
GUID = Getcurpageguid ();
}

Clientscript.registerhiddenfield (Hidden_page_guid, GUID);
return GUID;
}



<summary>
Get a unique identifier for the current page
</summary>
<returns></returns>
private String Getcurpageguid ()
{
String pageguid = Request.params[hidden_page_guid] = = null? "None": Request.params[hidden_page_guid]. ToString ();
Log. Debug ("Execute Getcurpageguid () after Page_guid:" + pageguid);
return pageguid;
}
/*/**/used in events that prevent duplicate submissions

if (! ispagerefreshed)
{

}

Else

{

Repeat Commit

}

. NET prevents duplicate submissions