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| File Upload Size Limit |
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This message was discovered on ASPFriends.com 'aspngfreeforall' list.
Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions.
| Jacob Kruger |
Hi all
Playing around with uploading files using HttpPostedFile.
Seems like there's a limit on the size of the file (Request?) of around 4Mb.
Anyone found a way to work around this, or increase the limit, or am I doing something wrong?
When I try a bigger file I get a DNS error in IE, and in Netscape, the page just goes nowhere.
Never hits the code.
Would seem to be some sort of server configuration issue.
Cheers
Jacob Kruger Web Developer Click here to reveal e-mail address
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| Yannick Smits |
(From Scott Guthrie) By default ASP.NET limits the size of file uploads to around 4Mb. This is to prevent denial of service attacks where people try to bring down a server by launching massive files at it. To enable support for larger files, you should add the following configuration setting value to your apps (or machine's web.config file):
<configuration> <system.web> <httpRuntime maxRequestLength="4096" /> </system.web> </configuration>
Note that the "4096" value above is the size in Kbytes that is configured out of the box (in machine.config). You should change it to be whatever size you want.
hth, Yannick Smits
"Jacob Kruger" <Click here to reveal e-mail address> wrote in message news:643424@aspngfreeforall... [Original message clipped]
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| Das (VIP) |
You have to use the Try...Catch...Mechanism to handle these type of unexpected errors.
Try the following code
Try myFile.PostedFile.SaveAs("c:\inetpub\wwwroot\yourwebapp\upload" & strFileNameOnly) lblMsg.Text = "File Upload Success." lblFileContentType.Text = "Content type: " & MyFile.PostedFile.ContentType lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength) & " Catch exc as exception lblMsg.Text = "File Upload Failure: Error Details are as follows: <br><br>" & exe.ToString() Finally ' Clean up code goes here. We do not have any cleanup code in this example. End Try
To know more about the try...Catch...finally exception handling mechanism, read my article at http://aspalliance.com/das/trycatchfinally.aspx
:-) Das.
----- Original Message ----- From: "Filipe Clemente" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Wednesday, April 24, 2002 1:15 PM Subject: [aspngfreeforall] Re: File Upload Size Limit
[Original message clipped]
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| Peter Ma |
I use a Try-Catch block to catch the error, but I still can't upload the file over 30Mb to web server under the same config. I still show me sth like Time-out... Can you upload a oversize file successfully by modifying the codes? :(
Peter
[Original message clipped]
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| Das |
I haven't tried uploading a 30 mb file.
As you are getting a timeout, you may need to increase the timeout for your page. I believe, it is the same old Server.ScriptTimeOut property to set the timeout in ASP .net
iN THE PAGE load event, give something like
Server.ScriptTimeOut = 1000, where 1000 is in seconds
Let us know, if this solves your puzzle.
Das.
----- Original Message ----- From: "Peter Ma" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Wednesday, April 24, 2002 1:52 PM Subject: [aspngfreeforall] Re: File Upload Size Limit
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| Admin |
It is my experience that if you upload a file that is too large then the aspx code will not even execute so the try..catch is useless. All I can suggest is perhaps some client-side code to check the size. How? No idea. Or maybe there is a friendly .net way to tap into the isapi request to see that it violates the max request size.
There are a lot of people out there wrapping this functionality in 'for sale' controls - i have no idea how they achieve what you need but i can only assume they do. Maybe worth checking out. And i'll give you a dollar if you pass on the 'how' to me :)
Good luck.
-----Original Message----- From: Das [mailto:Click here to reveal e-mail address] Sent: 24 April 2002 18:36 To: aspngfreeforall Subject: [aspngfreeforall] Re: File Upload Size Limit
You have to use the Try...Catch...Mechanism to handle these type of unexpected errors.
Try the following code
Try myFile.PostedFile.SaveAs("c:\inetpub\wwwroot\yourwebapp\upload" & strFileNameOnly) lblMsg.Text = "File Upload Success." lblFileContentType.Text = "Content type: " & MyFile.PostedFile.ContentType lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength) & " Catch exc as exception lblMsg.Text = "File Upload Failure: Error Details are as follows: <br><br>" & exe.ToString() Finally ' Clean up code goes here. We do not have any cleanup code in this example. End Try
To know more about the try...Catch...finally exception handling mechanism, read my article at http://aspalliance.com/das/trycatchfinally.aspx
:-) Das.
----- Original Message ----- From: "Filipe Clemente" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Wednesday, April 24, 2002 1:15 PM Subject: [aspngfreeforall] Re: File Upload Size Limit
[Original message clipped]
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| Ben Hyrman |
Just a shot in the dark....but if you're hitting timeout errors, try increasing the script timeout setting (I know it's in IIS for ASP, not a clue for ASP.NET)
[Original message clipped]
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| Das |
Oh Well, you can verify the size of the File that is to be attached before Uploading itself, and it is from the server side though.
IF MyFile.PostedFile.ContentLength > 1048576 Then lblWarning.Text = "You cannot upload a file which is of more than 1 MB" End If
So, are you looking for this kind of verification before any upload begins? If so, can I have my dollar!!
:-) Das.
----- Original Message ----- From: "Admin" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Wednesday, April 24, 2002 2:39 PM Subject: [aspngfreeforall] Re: File Upload Size Limit
[Original message clipped]
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| Admin |
I'm no expert but I'll venture to say that you may not be correct about that because the the file is already 'uploaded' before any .net code executes. The file is sent as part of the request. But the problem is the request fails because of the size. So that server code is of no use - you're checking the contentlength of something that is already at the server (if it ever gets to the server).
I'm a mean bugger and demanding too so you'll have to work much harder for that dollar :)
Seriously though, i think this is a real problem that makes this kind of uploading with http look lego-ish when compared to 'real' ftp!?
-----Original Message----- From: Das [mailto:Click here to reveal e-mail address] Sent: 24 April 2002 20:13 To: aspngfreeforall Subject: [aspngfreeforall] Re: File Upload Size Limit
Oh Well, you can verify the size of the File that is to be attached before Uploading itself, and it is from the server side though.
IF MyFile.PostedFile.ContentLength > 1048576 Then lblWarning.Text = "You cannot upload a file which is of more than 1 MB" End If
So, are you looking for this kind of verification before any upload begins? If so, can I have my dollar!!
:-) Das.
----- Original Message ----- From: "Admin" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Wednesday, April 24, 2002 2:39 PM Subject: [aspngfreeforall] Re: File Upload Size Limit
[Original message clipped]
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| Little, Ambrose |
Surely there's a way to request file size before actually uploading. I mean, I've got a download manager that always tells me the size of the file before downloading it (be it FTP or HTTP). Shouldn't similar functionality be available on the receiving server's end of an upload?
--Ambrose
[Original message clipped]
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| Das |
[Original message clipped]
No. The example that I have given
IF MyFile.PostedFile.ContentLength > 1048576 Then lblWarning.Text = "You cannot upload a file which is of more than 1 MB" End If
MyFile.PostedFile.ContentLength can be used even though if you have not uploaded the file to the web server. So, we are finding the size of the file without uploading to the web server.
Try this example
<example>
<html> <head> <script language="VB" runat="server">
Sub Upload(Source As Object, e As EventArgs)
If Not (myFile.PostedFile Is Nothing) Then lblFileContentType.Text = "Content type: " & MyFile.PostedFile.ContentType lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength) & " bytes" End If End Sub </script>
</head> <body>
<h3>File Upload</h3>
<form enctype="multipart/form-data" runat="server"> File: <input id="myFile" type="file" runat="server"> <input type=button value="Upload" OnServerClick="Upload" runat="server"> <asp:label id=lblFileContentType runat="server" /> <asp:label id=lblFileSize runat="server" /> </form>
</body> </html>
</example>
So, this solution works well
----- Original Message ----- From: "Admin" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Wednesday, April 24, 2002 3:48 PM Subject: [aspngfreeforall] Re: File Upload Size Limit
> I'm no expert but I'll venture to say that you may not be correct about that [Original message clipped]
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| TomMallard |
Lego...good one...
For this problem, uploads can be screened by javascript on the client with a function using the File object to get the size property value after the user selects it in a <input type=file> box. You could then alert() a message to the user that it's too big and not submit the page and return focus to the input box instead.
tom mallard seattle -----Original Message----- From: Admin [mailto:Click here to reveal e-mail address] Sent: Wednesday, April 24, 2002 12:48 PM To: aspngfreeforall Subject: [aspngfreeforall] Re: File Upload Size Limit
I'm no expert but I'll venture to say that you may not be correct about that because the the file is already 'uploaded' before any .net code executes. The file is sent as part of the request. But the problem is the request fails because of the size. So that server code is of no use - you're checking the contentlength of something that is already at the server (if it ever gets to the server).
I'm a mean bugger and demanding too so you'll have to work much harder for that dollar :)
Seriously though, i think this is a real problem that makes this kind of uploading with http look lego-ish when compared to 'real' ftp!?
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| Ben Hyrman |
It would seem that the only way to check pre-upload would be through client-side code...However, Javascript doesn't allow access to the file system, and ActiveX would need to be allowed by the browser (not to mention it would have to be a browser that supports ActiveX).
There are a few well-published security holes for Netscape and IE that would allow access to get the file size, but you don't really want to depend on that as a good alternative.
I'll keep digging though...
[Original message clipped]
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| Ben Hyrman |
Still digging, but here's a bit more...the process is outlined in RFC 1867 (http://www.ietf.org/rfc/rfc1867.txt), which claims to be obsoleted by RFC 2854...however RFC 2854 makes no mention of file upload so we'll go off of 1867.
In RFC 1867, it strongly suggests that browsers include the length of the file in the overall content-length field of the http header. As this RFC appeared in 1995, I'd hope that all browsers now do this.
So, the hard way would be to check the header yourself, the easy way would be to use the wonderful code Das supplied ;-) and, if anyone wants more details, chech out http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/cpconhtmlinputfilecontrol.asp
Ben
[Original message clipped]
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| Admin |
Hi Das, I know I'm bugging everybody now. I was going to take this offline but i think it is an important enough subject given the widespread use of this seemingly 'useful yet simple' feature.
Again, I think you misunderstand me. See, for your code to access the .PostedFile the file contents must already have been "posted" - ie. it's already at the server. It has been 'uploaded' in the 'request' from the client (the 'request' being "i want to upload this file please" and shoving in your face before you can reply). It's in server-side memory and the SaveAs method takes it from memory and persists it to disk (ie. your code).
The limitations only really raise their heads when the file is too big because the server-side code never executes. I suppose you could set a huge maximum file size allowable and use code like yours to see if a file is too big for your application but this would be dangerous I'd imagine.
Anyway, that's me. Again.
And still clinging tightly to that dollar!
jh
-----Original Message----- From: Das [mailto:Click here to reveal e-mail address] Sent: 24 April 2002 22:16 To: aspngfreeforall Subject: [aspngfreeforall] Re: File Upload Size Limit
[Original message clipped]
No. The example that I have given
IF MyFile.PostedFile.ContentLength > 1048576 Then lblWarning.Text = "You cannot upload a file which is of more than 1 MB" End If
MyFile.PostedFile.ContentLength can be used even though if you have not uploaded the file to the web server. So, we are finding the size of the file without uploading to the web server.
Try this example
<example>
<html> <head> <script language="VB" runat="server">
Sub Upload(Source As Object, e As EventArgs)
If Not (myFile.PostedFile Is Nothing) Then lblFileContentType.Text = "Content type: " & MyFile.PostedFile.ContentType lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength) & " bytes" End If End Sub </script>
</head> <body>
<h3>File Upload</h3>
<form enctype="multipart/form-data" runat="server"> File: <input id="myFile" type="file" runat="server"> <input type=button value="Upload" OnServerClick="Upload" runat="server"> <asp:label id=lblFileContentType runat="server" /> <asp:label id=lblFileSize runat="server" /> </form>
</body> </html>
</example>
So, this solution works well
----- Original Message ----- From: "Admin" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Wednesday, April 24, 2002 3:48 PM Subject: [aspngfreeforall] Re: File Upload Size Limit
> I'm no expert but I'll venture to say that you may not be correct about that [Original message clipped]
| ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP
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| Ben Hyrman |
I'm not so sure....
It could be possible that the code from Das will check the content-length of the header once the header is received by the server _but_ before the upload is started (or at least significantly underway). The file doesn't actually get included into the http post until a bit later...which would give the server plenty of time to abandon the connection and send some sort of graceful error to the client.
I suppose there's really only a couple ways to validate this...and no one from the MS .NET development group seems to be chiming in....so it's time to do some more digging and testing. I'll post again once I figure out the sequencing...
To get around standard users, I would utilize the built-in size constraint of the form field. To get around somewhat sneaky users, check the size server-side in what, I assume, is a method that checks size based on content-length before the upload begins. To get around wiley users...well, I'm not sure yet. To get around any file size limitations...well, if you really need to send large files, use a protocol designed for sending large files ;-)
Ben
----- Original Message ----- From: "Admin" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Wednesday, April 24, 2002 4:39 PM Subject: [aspngfreeforall] Re: File Upload Size Limit
[Original message clipped]
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| Jacob Kruger |
You can catch the problem ocurring using the Application_BeginRequest event in the global.asax file, but no matter what I try put in there, it still seems to generate the same DNS error.
Tried this:
Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs) ' Fires at the beginning of each request If Request.ContentLength > 2048 Then Response.Clear() Response.Redirect("test.htm") End If End Sub
Jacob Kruger Web Developer Click here to reveal e-mail address
[Original message clipped]
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| Filipe Clemente |
Hi,
I started this discussion about how to handle the uploaded file size error when the maximum size is reached. Yesterday I wasn't here to discuss because here in Portugal we had a holiday ... :) I agree entirely with jh ... The code Das posted assume that the file was entirely received by IIS and so the size has to be below the maximum size. When u go to "MyFile.PostedFile.ContentLength" the file was already uploaded. U can choose if u save it or not but it have already passed the check for maximum size.
So I think only guys from Microsoft can help us on how to handle this error. I don't know if anyone of them read this list but it would be great if they could make some "light" on this matter ....
Thanks for your interest.
Filipe Portugal
-----Original Message----- From: Admin [mailto:Click here to reveal e-mail address] Sent: quinta-feira, 25 de Abril de 2002 0:40 To: aspngfreeforall Subject: [aspngfreeforall] Re: File Upload Size Limit
Hi Das, I know I'm bugging everybody now. I was going to take this offline but i think it is an important enough subject given the widespread use of this seemingly 'useful yet simple' feature.
Again, I think you misunderstand me. See, for your code to access the .PostedFile the file contents must already have been "posted" - ie. it's already at the server. It has been 'uploaded' in the 'request' from the client (the 'request' being "i want to upload this file please" and shoving in your face before you can reply). It's in server-side memory and the SaveAs method takes it from memory and persists it to disk (ie. your code).
The limitations only really raise their heads when the file is too big because the server-side code never executes. I suppose you could set a huge maximum file size allowable and use code like yours to see if a file is too big for your application but this would be dangerous I'd imagine.
Anyway, that's me. Again.
And still clinging tightly to that dollar!
jh
-----Original Message----- From: Das [mailto:Click here to reveal e-mail address] Sent: 24 April 2002 22:16 To: aspngfreeforall Subject: [aspngfreeforall] Re: File Upload Size Limit
[Original message clipped]
No. The example that I have given
IF MyFile.PostedFile.ContentLength > 1048576 Then lblWarning.Text = "You cannot upload a file which is of more than 1 MB" End If
MyFile.PostedFile.ContentLength can be used even though if you have not uploaded the file to the web server. So, we are finding the size of the file without uploading to the web server.
Try this example
<example>
<html> <head> <script language="VB" runat="server">
Sub Upload(Source As Object, e As EventArgs)
If Not (myFile.PostedFile Is Nothing) Then lblFileContentType.Text = "Content type: " & MyFile.PostedFile.ContentType lblFileSize.Text = "File size: " & CStr(MyFile.PostedFile.ContentLength) & " bytes" End If End Sub </script>
</head> <body>
<h3>File Upload</h3>
<form enctype="multipart/form-data" runat="server"> File: <input id="myFile" type="file" runat="server"> <input type=button value="Upload" OnServerClick="Upload" runat="server"> <asp:label id=lblFileContentType runat="server" /> <asp:label id=lblFileSize runat="server" /> </form>
</body> </html>
</example>
So, this solution works well
----- Original Message ----- From: "Admin" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Wednesday, April 24, 2002 3:48 PM Subject: [aspngfreeforall] Re: File Upload Size Limit
[Original message clipped]
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| Ben Hyrman |
All,
This appears to be easily enough proven out through a quick bit of test code.
While not exactly conclusive or scientific...:
Startupload.innertext=system.datetime.now() Startgetcontentsize.innertext=system.datetime.now() ContentLength.InnerHtml = cStr(MyFile.PostedFile.ContentLength) Endgetcontentsize.innertext=system.datetime.now() startsave.innertext=system.datetime.now() MyFile.PostedFile.SaveAs("c:\uploads\upload.tmp") endsave.innertext=system.datetime.now() endupload.innertext=system.datetime.now()
The above indicates that all events happen within the same second....and, even on an upload to my web server running on this box, I know that uploading a 1 MB file doesn't take 1 second....
I'll bet that this all could be solved through a custom handler...but, frankly, a dollar isn't worth that kind of effort ;-)
Ben
----- Original Message ----- From: "Filipe Clemente" <Click here to reveal e-mail address> To: "aspngfreeforall" <Click here to reveal e-mail address> Sent: Friday, April 26, 2002 1:58 AM Subject: [aspngfreeforall] Re: File Upload Size Limit
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| leon jollans |
I had a similar problem with a single field where I couldn't upload = anything over 4 meg. I had to stick the tag below inside a system.web = tag in the web.config file.
<httpRuntime executionTimeout=3D"600" maxRequestLength=3D"8192"/>
You'll need to set the executionTimeout as well as the maxRequestLength = as there's nothing more annoying than getting 5 meg into an upload to = timeout. well, maybe some things :/
The default settings are 4 meg maxRequest and about 60 seconds timeout I = think.
hth.
L
-----Original Message----- From: Verinder Bindra [mailto:Click here to reveal e-mail address] Sent: 09 May 2002 17:09 To: aspngfreeforall Subject: [aspngfreeforall] file upload size limit
-- Moved from [aspngvs] to [aspngfreeforall] by Dana Coffey = <Click here to reveal e-mail address> --
i have one asp.net page with five <input type=3Dfile > element.. I am giving permission only to upload gif and jpg files..=20 problem is Everything works fine if file size is under 1.23 MB. If it exceeds then I don't even receive http post back on the server side..
Any Idea
regard's verinder
-----Original Message----- From: Jacob Grass [mailto:Click here to reveal e-mail address] Sent: Thursday, May 09, 2002 11:14 AM To: aspngvs Subject: [aspngvs] RE: Creating Custom Designer Controls
Ambrose-
Okay, I was confused as to what you were doing. You are looking for enhanced "design-time" support for your web control. I don't believe = that TypeConverters and UITypeEditors are specific to Windows Forms. To = create your dropdown list, you would probably create a custom TypeConverter. = For a GUI you would create a UITypeEditor. Here is an article that gives = great coverage of this stuff. It's Windows Forms, but I can't think of why = it wouldn't translate. . .=20
http://msdn.microsoft.com/library/default.asp?url=3D/library/en-us/dndotn= et/ht ml/vsnetpropbrow.asp
Jacob A. Grass
=20
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