I am trying to build a code to get the website asynchronously using webclient.download stringasync..I want to pass the data thus retrieved from dowloadstringcompleted to another function.[code]My problem is that I am not being able to pass on the values as StartDownload gets completed, while data is still being retrieved.
View 8 Repliesas per usual i am a little confused. I know DownloadStringAsync runs on a threaded pool with a default min and max threads limit, but what confuses is how would i call DownloadStringAsync say for example ten times.Example.I have an array with 10 URLS. Surely i would not use a for each loop of the array index to pass the url address while each time calling DownloadStringAsync(New Uri("someArray(index)") surely we can pass say a range of items from the array and let DownloadStringAsync decide on the threaded pool how many to process each time?
View 6 RepliesI'm trying to code a program that can download multiple files at once (on different threads of course).I have created a custom listview component that will allow me to add a progressbar directly to it.What my real question is, how can i take a url given by the user from an input box and create a new webclient to handle the download asynchronously and also report the progress without disturbing all of the other downloads in progress?
View 10 RepliestheEnchancedWinClient.WebClient.DownloadStrin20050601/n225789219.shtml")
will produce garbages.
[code].....
I'm downloading a file from my website using WebClient.DownloadFile(),I'm wanting to do it asynchronously, so my UI stays responsive, that would require me creating an array of web clients, is that bad practice? Or is it acceptable?I have looked into FileWebRequest, but thought WebClient looked easier to implement.
View 10 RepliesI make a program to check certain website.
The idea is to do webclient.DownloadStringAsync thingy and then wait till each one is solved. So like multi threading application.
The program itself is a single thread.
Well, when I loop 400 times it takes too long. Every time I press pause the program in debug it stop at this line[code]...
I don't know enough about VB.Net yet to use the richer HttpWebRequest class, so I figured I'd use the simpler WebClient class to download web pages asynchronously (to avoid freezing the UI).
However, how can the asynchronous event handler actually return the web page to the calling routine?[code]...
I'm trying to download a WebPage as a String, which works, however, I can not parse each line of Html at a time. I can either, Parse each Character, or parse the whole thing as a single String. Here's my
[Code]...
I have this code List<string> myList = new List<string>();
myList.AddRange(new MyClass1().Load());
myList.AddRange(new MyClass2().Load());
myList.AddRange(new MyClass3().Load());
myList.DoSomethingWithValues();
What's the best way of running an arbitrary number of Load() methods asynchronously and then ensuring DoSomethingWithValues() runs when all asynchronous threads have completed (of course without incrementing a variable every time a callback happens and waiting for == 3)
I'm trying to make an asynchronous upload operation but I got this error message:
Error occurred, info=An exception occurred during a WebClient request`.
Here's the upload function:
Private Sub UploadFile()
Dim uploads As HttpFileCollection
uploads = HttpContext.Current.Request.Files
[code]....
I have a listbox of items that need to be processed, and I would like to process them asynchronously on a separate thread. (Never done this before).So I created a Delegate, a Callback, called the method that does the work on the listbox items.
I am getting an exception "System.InvalidOperationException": Cross-thread operation not valid: Control 'ListBoxBlah' accessed from a thread other than the thread it was created on.
Doing the asynchronous operation for individual items doesn't make sense to me because I am only doing it to perhaps perform a large number of operations (the listbox may have 20000 items) in the background while allowing the user to do other stuff.
[Code]...
I've a vb.net web application where I'm referring to another vb.net dll by adding the reference of the dll and creating the object but after the call it waits for dll to finish operation and return a value before moving forward, is there a way I can do the same job asynchronously.
View 4 Repliesi am developing application for windows phone and i want to read an xml from the web so i am using on page loaded event :
Dim cl As New WebClient
AddHandler cl.DownloadStringCompleted, AddressOf cl_DownloadStringCompleted
cl.DownloadStringAsync(New Uri("demo.com/1.xml",UriKind.RelativeOrAbsolute))
and on cl.DownloadStringCompleted event :
Dim doc = XDocument.Load("demo.com/1.xml")
but for some reason i crashes ! the bug must be that i have not to use URI : "demo.com/1.xml" , but some else?
I currently have a web application project that also includes web services within the same project. I currently have a requirement to call the web service asynchronously. Since, I haven't added the web service as a web reference within the same project, I tried to call the web service method using delegates and I see an exception "HttpContext is not available. This class can only be used in the context of an ASP.NET request" when I tried to access the Application property in my web service method call.
[Code]...
In VB .NET, when you call RaiseEvent X(), is the function that handles the event X processed asynchronously or synchronously. I was under the impression that RaiseEvent and the processing of the event were Synchronous unless created explictly on another thread. I've been told otherwise though.
View 2 RepliesHow do i file download asynchronously in WPF vb.net?
Is there a timer control in WPF?
I am using vs2010 Pro
I need to write an app that downloads a file, uncompresses it, scroll through it and update sql table. Also print labels and invoices.
[code]...
Now i need to do a few hundred/thousand requests all at the same time or atleast over a short period. I am assuning i need to do this asynchronously. I have looked all over the net and tested various ways to communicate asynchronously and am pretty stumped. None of the examples out there seem to explain how i receive the xml return as a string ("which i will write to file or db")
Does anyone have any working code to do such a process?
I am trying to call this webservice asynchrounously in vb.net. So on the aspx side i added this property async="true". Now on the vb.net code side i have this function inside my webservice that i am calling.So -
dim as as webservice.webstring
as.functionasync(param1, param2)
im making a transport agent for exchange and am getting hung up on how to call a method asyncronously. Im doing this based on an msdn article but like usual they didnt provide the part of the code i need to figure out.the article is in C# but i converted it to vb in my project. [URL]I know I need to setup a delegate for the method and then invoke that delegate, but im not 100% on how to implement this.
Imports Microsoft.Exchange.Data.Transport.Routing
Imports Microsoft.Exchange.Data.Transport
Namespace TestTransportAgent
[code]....
[VS 2010 Beta with .Net Framework 3.5]I've written a C# component to asynchronously monitor a socket and raise events when data is received. I set the VB form to show message boxes when the event is raised. What I've noticed is that when the component raises the event synchronously, the message box blocks the component code and locks the form until the user closes the message. When it's raised asynchronously, it neither blocks the code, nor locks the form.
What I want is a way to raise an event in such a way that it does not block the code, but is called on the same thread as the form (so that it locks the form until the user selects an option.)
[Code]...
I have working code to read an RSS feed that uses:
Dim doc As New XmlDocument
doc.Load("http://...")
Dim channel As XmlElement = doc("rss")("channel")
Dim items As XmlNodeList = channel.GetElementsByTagName("item")
Unfortunately the doc.Load call causes the rest of the program to become unresponsive until it finishes.What's the best way to perform the load asynchronously and have a callback function to process the data?Edit: Here's the code I've tried using WebClient - the Load method is still lagging:
Private Sub checkResults()
'request rss feed
Dim w As New System.Net.WebClient
[code]....
The rssReadCallback method is executed fairly quickly after calling checkResults, but then the UI freezes during the Load method.
I have a flash video player embedded in a page which has javascript calls for it's controls, specifically calling playStarted() when the play button is pressed. I want to capture this event asynchronously to record when people are actually playing the video versus visiting the page, but I'm not really sure how to do this.
I was thinking the "hack" of a way would be to create a javascript function called playStarted() that would post the video ID to a separate ASP.NET page that would then record it to SQL (where I store my data on page visits and where I want to store my data on video plays.)
But ideally there is a better way to do this where I can register the javascript to the script manager so it can trigger a public sub asynchronously when it's called
I need to call a stored proc from a .NET web page which takes around 15 min to process. We do not want user not to be able to browse the website in the meanwhile. Is calling it asynchronously the way to go or are there any other recommended ways?
make an asynchronous stored proc call?
I have a program I would like to release, has 2 programs within it.1. The main program. 2. A resource utility.To release it, i'm going to package them both up using a 3rd party setup maker.Now, the question is this.I noticed in the snippets...theres 2 options.Update application synchronously or asynchronously.
First, whats the difference between the 2?Also, could I utilize that so it'll update from the clickonce, so I dont have to keep repackaging it?Also, I want all updates to be mandatory, vs optional like in clickonce default updates..where it gave the user the option to skip.Reasoning is, for cracks, hacks, etc, if it is modified, and i notice cracks, etc. it'll update and replace any cracks, etc. No "skip the update, so the hack/crack continues to work".
I want to upload a large file of tracking numbers and process them into our ordering system.
I used to use Server.ScriptTimeout = 3000
It worked until we upgraded our servers and now it crashes.
I'm Getting This webpage is not available The connection to www.YourSite.com was interrupted.
I could see the .csv file has been uploaded, but many tracking numbers do not get processed.
I'm thinking of maybe switching to a asynchronous update. But I cannot find any good source for it.
If you have any good ideas, please let me know.
I've been reading up on asynchronous function / web pages for ASP.NET 3.5 (we're not using v4 yet) but the ones I've seen all focus on performing a background task but then still coming back to finish up and send the response, after the task is complete.
What I want to do is simply kick off the background task (in this case a call to a web service) but then return a response to the browser immediately - ie. without waiting for the asynchronous task to complete. I don't even need to know if it succeeds or not.What is the best way to do that? I can't seem to find examples of kicking off what you might call an "orphan" background task in ASP.NET.
I thought of doing it via a javascript Ajax call on the page I show to the user, but the information passed to the web service is sensitive, so that's out of the question. But that kind of illustrates what I want to do.
[ed] Another idea: Is there an event in the ASP.NET model I can use which occurs after the response has been sent to the browser and the connection closed? ie. So more processing can occur without the user waiting for it?
I have a function in a module that returns a datatable.I need to call that function asynchronously and get the results in the Main thread (Main Form) in vb.net.
View 2 RepliesAll my paint calls are under OnPaint event of the form. my game is getting laggy so i was wondering if theres a way to paint images asynchronously using a background worker.
View 8 RepliesI have a bit of code that jumps around a few domains and adds a user to each of them. This follow is a piece of code I had to write to get around the issue of the .add and .invoke being ran asynchronously and occasionally causing errors.
It connects to the domain in question, passing a "CN" from the code in as a search filter but receives a COMException which is normally a LDAP sting config issue. The connection string in this is fine so I am not sure why it is having such a hard time.
Function GetUser(ByVal UserId As String) As DirectoryEntry
Dim objRootEntry As New DirectoryEntry
objRootEntry.Path = "LDAP://DC=SERVER,DC=LOCAL"[code]....
What Im making is like a face book and tagged login from my app
1. I have Combobox with 3 urls in there ( Facebook.com Tagged.com and Bebo.com )
2. I have a Form2 with webbrowser
3. I have a Button when clicked it should open up my form 2 and preview of the website which I selected in my combobox in form1
All I'm trying to do is when I select lets say facebook in my form 1 and click load it should open up my form 2 with facebook website in it.[code]Now when I click my button in form 1 it will load Form2 ( named Explorer1) but my form2 is not showing me facebook or tagged page for some reason