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I have some different requirements for my application. My application generates a well formatted XML which needs to be stored in database as string data or as file in some version controlled system. I am planning to create provider factory that will generate an object to interact either database or version control system. I like to control this thru my web.config file. How can I achieve this?
M.Sendilkumar
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One way to do this would be through a pattern called Dependency Injection. Microsoft have released an application block called the Unity Application Block[^] which you can use to this end.
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As Pete said, The Unity Application Block should help.
Just to save your fingers this CP article[^] might help get a handle on it.
Henry Minute
If you open a can of worms, any viable solution *MUST* involve a larger can.
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Dear all :
I create a simple code (window application) like following
Private Sub Button1_Click()
Dim Obj As Object
Dim asm As Assembly = Assembly.LoadFrom("TestApp.dll")
Dim ty As Type = asm.GetType("TestApp.appServ")
Obj = Activator.CreateInstance(ty)
Dim Istring As String = Obj.funct()
MessageBox.Show(Istring)
Obj.Dispose()
GC.SuppressFinalize(Obj)
Obj = Nothing
end sub
while TestApp.dll code follow that
using System;
using System.Collections.Generic;
using System.Text;
namespace TestApp
{
public class appServ : IDisposable
{
private bool disposed = false;
public string funct()
{
return "aad";
}
~appServ()
{
// call Dispose with false. Since we're in the
// destructor call, the managed resources will be
// disposed of anyways.
Dispose(false);
}
protected virtual void Dispose(bool disposing)
{
if (!disposed)
{
if (disposing)
{
// dispose-only, i.e. non-finalizable logic
}
// shared cleanup logic
disposed = true;
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
GC.Collect();
}
}
}
Before the button click the "TestApp.dll" allow be overwrite
but after button click , the file is locked until the main program exit.
Can anyone tell me how to solve it ?
Thanks
Michael 
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Michael Yip wrote: Can anyone tell me how to solve it ?
AFAIK, you can't. Once a process loads a .DLL, the file stays locked for the lifetime of the process that loaded it, even if you dispose of all objects created from it and even if you load the .DLL into another AppDomain.
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You can't. A dll remains locked until the process that created it ends. If you must have it terminate, you need to load the DLL into a separate AppDomain (which fires off a separate session), and then unload that AppDomain once it's finished with.
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Dear Pete O'Hanlon
Do you mean load all dll in another sub domain , and then terminal main domain ?
If this main domain have reference serval. that mean I need clone all dll into new domain and then kill my current domain
Thanks
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You only kill the other domain, not the primary domain. If you need to have dynamic load/unload capability for "plugin" assemblies, the only way to do that is to have your primary domain spawn another AppDomain, load the pluggable assemblies into that second domain, and unload the second AppDomain after your done using the dynamic assemblies. You can't kill your primary domain, because that would kill your whole app.
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That's a logical problem, not code-based. You can't remove things that are in use. Imagine you drinking coffee, and me trying to remove the cup from your hands.
What you can do however, is launch a second application that doesn't have the reference to the coffeecup. Err, assembly!
Launch app2, close your original app, delete the file, relaunch your original app, exit app2. Look into Process.Start 
Hope this helps,
I are troll
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Hi All,
I have a Bulk Copying Process which runs as nightly job puts data from db1 to db2 and scheduled in Windows schedular.
During this time its putting data in 3 files like 1. LogFile, 2. Status.txt and 3. Dat files. As it continues the files sizes increase, when it exceeds the size of existing physical memory, the BCP is failing.
What we need to do is to track if the BCP is failed. If it fails we need to get that information. Either from windows schedular or by calling any com component of emailing and to send the failure information.
Thanks,
Aleem Mohammad.
Thanks & Regards,
Md. Abdul Aleem
NIIT technologies
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It sounds like what you really need to do is rewrite your code so you're not loading entire files into memory all at once. Since this is just a bulk copy, you can get away with reading and processing one line at a time.
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Sorry I didnt get your point can u please eloborate me.
Thanks & Regards,
Md. Abdul Aleem
NIIT technologies
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The point is you didn't explain anything about the code that's causing the problem. You don't say anything about how it handles these files, why you suspect your using so much RAM, no nothing. So, how can anyone possibly help you.
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If you're talking about the bcp utility which ships with SQL Server, it doesn't read the whole file to memory so you are most likely hitting some other problem. One way to enhance bcp is to use batches.
However, to your question, add -e err_file parameter to the bcp command. That will log the errors to the file specified.
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hi, can someone help me. i am a bit confused on the compatibility of vb.net and ms excel 2007.
im working on a project that would use excel in a form..all the sample codes that i have researched, they didnt say if it'll work with 2007 excel. i really hope that you guys woud help on this.
thanx! kudos...\m/
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I have two existing (complex) .NET 3.0 Winform apps A and B that need to exchange information synchronously (using request/response). Both apps are running on the same computer at present, but perhaps over a LAN later.
Since I've used .NET Remoting in the past, I figured that's the way to go...
So I setup app A to host class X for Remoting, and I setup app B to instantiate class X (on A) and then invoke its methods.
Works great, except class X (being hosted on A) can't actually access the hosting app A. For example, it can't invoke A's methods, access its variables, etc.
The functional requirement is to have apps A and B exchange information, not simply to allow B to invoke an "isolated" object that's hosted by A, but which can't really interact with app A.
I've been searching all day, and so far all I've found is a passing reference that it should be possible for app A "to get a proxy to the remote object". But I don't have a clue how to do that, or what it implies.
ANY help would be greatly appreciated!
DT
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I was wondering...you could you a message queue for this kind of scenario...which could make the code more simpler...
Moim Hossain
R&D Project Manager
BlueCielo ECM Solutions BV
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I've encountered this exception with the code below. Clearly the stream hasn't been disposed, and Microsoft have acknowledged this as a bug and released a hotfix, but when I run the hotfix, I get an error saying the program to be updated may be missing or the wrong version. Does anyone know anything about this?
using (FtpWebResponse response = (FtpWebResponse)ftpRequest.GetResponse())
{
StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
string fileName;
do
{
fileName = sr.ReadLine();
Console.WriteLine(sr);
}
while (sr != null);
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Hi Brady,
I am not familiar with this problem, I do have some comments/questions:
- how often does it fail and under which circumstances?
- there are several 100 Google hits for your subject line
- you did not mention at what line the exception gets thrown
- you did not provide any info/link regarding the Microsoft acknowledgement
- are you aware StreamReaders need disposed of too? you might consider a second using statement.
Hope you'll get a solution.
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Apologies.
1. It always fails, under all circumstances. There aren't really many circumstances.
2. That's how I found the MS patch.
3. The exception gets thrown on sr.ReadLine();
4. KB918462.
5. Thanks. This is server side and a leak could be expensive.
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OK,
based on "...The HttpWebRequest class automatically tries to reopen a connection to the Web server to complete the transfer. When the transfer is successful, the EndGetRequestStream method incorrectly returns the Stream object from the first failed connection attempt, instead of the Stream object from the successful connection attempt..." from here[^] my best guess is you are systematically getting the same error on the first attempt, possibly a timeout (that is assuming your request is correct of course). Can you try and allow a larger timeout? or is there a huge amount of data involved?
You might try to validate your web response before calling on its stream? Maybe the StatusDescription property might shed some light.
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Luc Pattyn wrote: Maybe the StatusDescription property might shed some light.
226 Transfer completed.  StatusCode: Closing Data.
This is a listing of my personal web site, not too many files. When I run LS in a console I get:
1751 bytes received in 0.07Seconds 25.75Kbytes/sec.
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First impression is the FTP server has a bug!
You might want and test:
1. your client code on a different FTP server;
2. other FTP clients on your current FTP server.
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Luc Pattyn wrote: First impression is the FTP server has a bug!
My first impression is that the framework has a bug and that Microsoft have even issued a hotfix for it. I will nonetheless perform your suggested tests.
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