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Guys,
I am having problems with the use of the CacheItemRemovedCallback event within an ASP.NET/C# website I am building. The below code is from my global.aspx file. The code loads XML/XSL objects into the Cache for later use. I also create a Cache dependency so should any files change which my XML/XSL objects use, the Cache is updated automatically. The code works only when something is removed from the Cache by another aspx file, since the code correctly identifies the HttpContext. However, when one of my files is changed and the RemovedCallback() function is fired, for some reason the Context and the HttpContext are both null. As such my code never has a chance to update the Cache again. Rather it exists "without an error" as soon as I try to use Cache.Insert. Does anyone know if this is a bug in Beta 2, or am I missing something, like the use of a special Context object?
Any help greatly appreciated..........
Cheers,
Tim.
<%@ Import Namespace="System.Xml.Xsl" %>
<%@ Import Namespace="System.Xml.XPath" %>
<%@ Import Namespace="System.Web.Caching" %>
<%@ Import Namespace="CommerceEngine.Common" %>
private static CacheItemRemovedCallback onRemove = null;
private XPathDocument CommerceListXmlObj;
private XslTransform CommerceListXslObj;
public void Application_OnStart()
{
ApplicationConfiguration.OnApplicationStart(Context.Server.MapPath( Context.Request.ApplicationPath ));
onRemove = new CacheItemRemovedCallback(this.RemovedCallback);
CommerceListXmlObj = new XPathDocument(CommerceEngineConfiguration.CommerceListXmlFilePath);
HttpContext.Current.Cache.Insert("CommerceListXmlObj", CommerceListXmlObj, new CacheDependency (CommerceEngineConfiguration.CommerceListXmlFilePath), DateTime.Now.AddHours(1), TimeSpan.Zero, CacheItemPriority.Default, CacheItemPriorityDecay.Slow, onRemove );
CommerceListXslObj = new XslTransform();
CommerceListXslObj.Load(CommerceEngineConfiguration.CommerceListXslFilePath);
HttpContext.Current.Cache.Insert("CommerceListXslObj", CommerceListXslObj, new CacheDependency(CommerceEngineConfiguration.CommerceListXslFilePath), DateTime.Now.AddHours(1), TimeSpan.Zero, CacheItemPriority.Default, CacheItemPriorityDecay.Slow, onRemove );
}
public void RemovedCallback(String k, Object v, CacheItemRemovedReason r)
{
switch(k)
{
case "CommerceListXmlObj" :
CommerceListXmlObj = new XPathDocument(CommerceEngineConfiguration.CommerceListXmlFilePath);
HttpContext.Current.Cache.Insert("CommerceListXmlObj", CommerceListXmlObj, new CacheDependency(CommerceEngineConfiguration.CommerceListXmlFilePath), DateTime.Now.AddHours(1), TimeSpan.Zero, CacheItemPriority.Default, CacheItemPriorityDecay.Slow, onRemove );
break;
}
}
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Hi folks,
Lately I have been spending some time attempting to get my head around ASP.NET. One on the exercises I have set myself is to build a modest little website. But I have run into a few design problems that I hope some one can help me with.
I have decided to have a standard header to each page. (Just like code project has the standard header at the top of this page.) In pure ASP I would have had these as a SSI (eg .
In ASP.NET this still works but when I attempt to add make the header a bit smarter by making it a WebForm things get all confused. This happens because they are each seperate pages with seperate C# code behind them. Which means there is two <@ Page ...> directives. Which means it doesn't work!
What is the proper design pattern/model to acheive this type of behaviour?
I hope this makes sense to you all...
Matt
------
Accept that some days you are the pigeon and some days the statue.
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I think the ASP.NET way would be to create a new server control encapsulating the header.
A lot more info on doing such a thing can be gleaned from the IBuySpy set of websites.
HTH,
James
Sonork ID: 100.11138 - Hasaki
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thanks for the tip. I am having a look at ibuyspy right now!
Matt
------
Accept that some days you are the pigeon and some days the statue.
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There are 2 choices, you could compile your own control into a dll, or you could make a UserControl file, with an ascx extension.
Judging by the fact that you are making a header, i'm betting you want to make a UserControl, which is much like the old asp include file, except much much cooler.
here's the msdn docs on UserControls, ( watch for wrapping )
http://msdn.microsoft.com/library/?url=/library/en-us/cpref/html/cpref_start.asp?frame=true
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Thanks for the help. Much appreciated. I am experimenting with them at the moment.
Matt
------
Accept that some days you are the pigeon and some days the statue.
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Matt,
You can make that header two ways.
1.) make it a Web User Control and then on any page you want that headret you simply insert your header user control.
You also could implement the Application BeginRequest event in the global.asax file.
Like this and emit a header without having to explicitly add it to each page.
Sub Application_BeginRequest(sender As Object, e As EventArgs)
' emit page header
Context.Response.Write("<html>" + ControlChars.Lf + _
"<body bgcolor=#efefef>" + ControlChars.Lf + "<hr>" + _ ControlChars.Lf)
End Sub
Good Luck,
Martin Garins
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Hello;
I'm in trouble with .NET framework when i want to build and browse a new created empty aspx page. I'm getting following message;
Server Error in '/myaspx' Application.
-----------------------------------------------------------------------------
Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
Parser Error Message: The 'Inherits' attribute is not supported by the 'application' directive.
Source Error:
Line 1: <%@ Application Codebehind="Global.asax.vb" Inherits="myaspx.Global" %>
Source File: c:\inetpub\wwwroot\myaspx\global.asax Line: 1
-----------------------------------------------------------------------------Version Information: Runtime Build:1.0.2914.16; ASP.NET Build:1.0.2914.16
How can i solve that problem. Anybody help me?
Thank you...
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Here is my question in all its simplicity:
WHAT THE HECK IS .NET????????
I have searched the whole frigging net and all ive found is so jargon that means absolutly nothing. I have even gone to the trouble of getting .NET Server Beta 3 just to see and there is nothing new.
Please tell me i'm not the only one who is thinking this! 
.NET or not .NET? MFC is the question......
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Is there a way to define an assignment operator on a managed C++ class?
I tried using the C# syntax, but that doesn't seem to want to work...
What I've got (that isn't working) is something like this:
public __gc class ATTRIB
{
ATTRIB();
ATTRIB(const ATTRIB* a);
virtual ~ATTRIB();
static implicit operator ATTRIB(ATTRIB* a) { return new ATTRIB(a); }
}
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Is it possible to create a single file NET assembly from C# and MC++?
I wrote MC++ class that is a sort of proxy for ASPI API. The rest of the program is written in C++.
I'd preffer single-file than multi-file assembly. Is it doable?
CK
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correction: the rest of the program is of course written in C# nor C++
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I have a class that has been written in plain C++ that makes calls into
a library that exports many functions that take char array parameters.
What I want to know is how I can get / convert the data in a .NET String
object into a plain char array so that I can pass the value into
the function call? Basically any help converting the new .NET types into
older style "unsafe" types would be helpful. Thanks.
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You can use one of two things, either the StringBuilder or you can marshal the string data.
If you need a buffer of some sort, like you need for getting a special folder you need to use StringBuilder
Code courtesy Tomas Restrepo
[ DllImport("shell32.dll") ]
private static extern bool SHGetSpecialFolderPath(IntPtr hwndOwner, StringBuilder lpszPath, int nFolder, bool fCreate);
StringBuilder dirPath = new StringBuilder(256,1024);
bool res = SHGetSpecialFolderPath(IntPtr.Zero, dirPath, CSIDL_APPDATA, true);
If you just need to pass a string in to a function but do not modify it use marshalling. I don't know what will happen if you try to modify it, it could reflect the change, or it could blow up on you.
From Inside C# by Tom Archer
[DllImport("user32.dll", CharSet=CharSet.Unicode)]
static extern int MessageBox(
IntPtr hWnd,
[MarshalAs(UnmanagedType.LPWStr)]
string msg,
[MarshalAs(UnmanagerType.LPWStr)]
string caption,
int type
);
MessageBox(0, "Hello, World!", "This is called from a C# app!", 0);
Both code snippets are untested, but should demonstrate how to do it. I made a minor change in Tom Archer's code and that was to reflect that handles, such as HWNDs should be IntPtr's instead of int's.
HTH,
James
Sonork ID: 100.11138 - Hasaki
and a digital cookie (not chocolate chip, its computer chip) goes to whoever can be the first to tell me what Hasaki means. I know someone registered on here can tell me
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Thanks for the good information... but is there a way I can convert to an unsafe type BEFORE actually passing the data into a function?
If I've got a String* or Stringbuilder* in Managed C++ and want to convert it into an
unmanged type like char* or LPStr, how is that possible?
-dvryce
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Can't say I know how.
I haven't looked at MC++ too much, only because I don't have any old code I have to work with that would warrant MC++ to me.
Perhaps the DOTNET mailing list could be of some help? Its been a great resource for myself and many others. It is a high volume mailing list though so you'll probably want to subscribe to the digest version, or use the web-based interface.
Sorry I couldn't be of more help,
James
Sonork ID: 100.11138 - Hasaki
and a digital cookie (not chocolate chip, its computer chip) goes to whoever can be the first to tell me what Hasaki means. I know someone registered on here can tell me
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Hi all,
I have an MFC App.
I'm trying to port it to MC++.
For starters, I'm just trung to port one single View.
When i give __gc , the compiler spews out errors.
macros, DECLARE_MESSAGE_MAP, et al are not MC++ compliant!
So, what do i do now?
I don't want to make this a COM Componenet & use P/Invoke.
I want to change my app to MC++.
What do you guys suggest? I port everything to WinForms?
Man, I have many CFormView , & CDialog's! It would take like eons to do that 
PLEASE help guys/gals! any suggestions?
In Anticipation..........
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This question was also posted to DevelopMentor's DOTNET mailing list and an answer came up. I'm posting it here as well so others can find the answer you received.
Brad Wilson wrote:
MFC is not "managed-compatible". If you intend to have your UI be managed, you need to re-write it in WinForms. My suggestion if you do this is to use C#, since MC++ isn't supported with the WinForms visual tools in VS.net. Gluing together MC++ and C# is obviously trivial (assuming that, at the end of the day, there's any reason to keep your C++... there may not be, if the majority of your code is UI code).
Brad
--
Read my web log at http://www.quality.nu/dotnetguy/
Sonork ID: 100.11138 - Hasaki
and a digital cookie (not chocolate chip, its computer chip) goes to whoever can be the first to tell me what Hasaki means. I know someone registered on here can tell me 
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Hello All:
Can anyone tell me what is the equivalent of using data-aware classes in vb.net? Is it by using dataset classes, i.e by creating *.xsd files? If thats the case how do we "set" the connection, database name etc., at runtime? That is at runtime the user would choose the server/database name.
Thanks for all the help
Rashmi
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Hi!
I really need to find a simple way to produce a messagebox, similar to that one would use in a standard windows application before deleting items, saving och closing or whatever.
I used to do this in ASP by using JavaScript on the client (alert...) but I thought I would not have to bother with that now. I've been searching through the SDK several times and still can't find anything usefull. The MessageBox I found seems to work only in Windows applications, not in browsers.
Has anyone seen, heard or done anything that might help me?
Consultant, system/web developer.
IMS Consulting AB, Sweden
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ASP.NET is a server-side thing.
To do anything like that you're still going to have to rely on client-side script.
If you want you could roll your own MessageBox component that you could place on your ASPX pages and use like the Windows version, but in the end it'll have to call down to alert as well. I also have no experience in doing such a thing :p
James
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Hi!
Thanks
I've managed to create a messagebox component but I immediately ran in to further problems: If I want to prompt the user for confirmation or input, how do I get the value back to the server?
As you pointed out I'll be needing to use scripting inside the component, but I still can't figure out how to get the values back from the client immidiately.
I realise you are not experienced in this (nor am I), but I thought I might as well elaborate on my thread so that maybe someone else can supply more information
Consultant, system/web developer.
IMS Consulting AB, Sweden
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I think the easiest thing to do, would be to redirect to a confirmed page.
I think this is what hotmail does in its Junk Mail folder's "Empty Folder" command. You click the button to empty the folder, that brings up the confirmation Alert box, without moving to another page.
If you click ok, it then goes to the confirmed (delete all from folder) page. I think if you click cancel it does nothing, but I've never cancelled that dialog before 
HTH,
James
Sonork ID: 100.11138 - Hasaki
and a digital cookie (not chocolate chip, its computer chip) goes to whoever can be the first to tell me what Hasaki means. I know someone registered on here can tell me
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Hi,
You all are the intellectual persons on the list. Among u some r Software Engineer, Professor, students, in short u all r gurus as well as thinkers from different race and religion.Ur time is very precious and valuable. If you don’t mind please visit this site,
http://www.orst.edu/groups/msa/everwonder.swf .(Please turn on the sound)
It will take around 5-7 min(s).Think for just 2min(s) after visiting this site and ask yourself what is the reality, what r the facts and what is the JUSTICE and RIGHTS.
If u think u waste ur time by reading this mail I’m extremely sorry.
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