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You're right, of course. However, I do feel the MSDN sample provided enough information for anyone to create a simple archive of files. The next step would be to implement all the other code required to make it compatible with WinZip, GZip etc.
txtspeak is the realm of 9 year old children, not developers. Christian Graus
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Indeed, and that's probably more difficult than it sounds. About a week ago, I took a look at the bytes in a zip archive using no compression and only one 2-byte file and it was confusing. Would probably be best to use a third-party library (which shouldn't be a problem, but people tend to prefer built-in .Net solutions due to their reliability). It's not unreasonable to ask if such a class exists in .Net... it's quite easy to overlook, given its size. In fact, I may have found a class (new to .Net 3.0) that does just what the OP wants (posted below), though I wasn't sure if it was compatible with WinZip (read somewhere it wasn't), so I left it as an exercise for the reader to look into that.
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I did actually respond to this question before I noticed that it was a repost, hence I had not seen your suggestion, which looks like the answer. I may well try it myself.
txtspeak is the realm of 9 year old children, not developers. Christian Graus
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i am using a compress a file using System.IO.Compress.GZipStream in c# . But i needs compress a folder using is this same class .. how can compress folder . because GZipStream only accept a file Stream
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Delete one of the questions: looks like you've asked it twice.
me, me, me
"The dinosaurs became extinct because they didn't have a space program. And if we become extinct because we don't have a space program, it'll serve us right!"
Larry Niven
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anishkannan wrote: GZipStream only accept a file Stream
Actually no, it can take any Stream
Anyway, GZipStream has very week compression and is (as you saw) hard to use. SharpZipLib[^] is much easier to use and compresses a lot better. It supports GZip in addition to Zip(64 and normal) and BZip2, it even supports streams that can not seek.
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Not sure if C# supports Zip archives out of the box. Though you could use XML to easily create your own file format. Not sure if they are compatible with programs like WinZip, but check out System.IO.Packaging.ZipPackage (you must add a reference to WindowsBase.dll to use the Packaging namespace). The bottom of that page also has links to other libraries and such you can use if that doesn't work for you.
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should I use event method or to a code for that?
please give me solution.
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You need to write your own code to make a set of check boxes act like a group of radio buttons - probably in the event, as you mentioned.
Me, I'm dishonest. And a dishonest man you can always trust to be dishonest.
Honestly. It's the honest ones you want to watch out for...
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Why not use RadioButton itself?
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actully i want to copy the XML file into the database table, but in distination table there is an extra column. i want to add a new column and gave it a value.
DataSet ds = new DataSet();
ds.ReadXml("C:\\abc.xml");
DataTable sourceData = new DataTable();
sourceData = ds.Tables[0];
DataColumn UID = new DataColumn();
UID.DataType = System.Type.GetType("System.Int32");
UID.ColumnName = "UID";
sourceData.Columns.Add(UID);
sourceData.Columns["UID"] = 12;
i have done the mapping....
bulkCopy.ColumnMappings.Add("UID", "UID");
.
.
.
.
and in end
bulkCopy.DestinationTableName = "Contact";
bulkCopy.WriteToServer(sourceData);
but UID column always gave the null value in database...
any idea??
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i got it...
i have tried this
for (int i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
ds.Tables[0].Rows[i]["UID"] = 12; // or your dates
}
instead of
ds.Tables[0].Columns.Add("UID").defaultValue=12;
Thanks to every one of those who could not help me
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Currently the application I have is single threaded. When the user goes into the form it sends a query to mySQL and starts to populate the UI with data.
The question I have is should I being running this on a separate thread using the invoke methods or is there some other/better way of doing this.
The queries are fairly optimized although they are not stored procs. When we run this in some of our centers that are on VPN this can take alot of time.
Any ideas and or suggestions welcome.
Thank you.
BTW I will be doing this reworking in VS2010 so these would actually be task...
Humble Programmer
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IMO everything that fetches data outside the local PC needs to be threaded (as well as lengthy calculations), you simply should never let the GUI responsiveness depend on external factors. However I'm not sure many will agree, this point of view may well be considered too academic.
Example: I just finished tthis article[^], it is a little app that fetches web pages from the CodeProject site, using BackgroundWorkers. Data fetching tends to take several seconds.
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What are your thoughts on updating the ui like that would it be better to load all of the data into a class and update the ui from that
Humble Programmer
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I think that goes without saying. But using MVC or MVVM doesn't preclude performing the data fetch asynchronously.
/ravi
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I am not familiar with MVS MVVM...
I am referring to winforms I don't know if that makes a difference or not...
Humble Programmer
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MVVM = Model View View-Model
Model = "class" (what holds the data)
View = "ui" (what presents the data)
View-Model = "ui class" (adds properties and such to a model so it plays well with the view)
Of those, the view-model is probably the most difficult to understand. For example, if you had a TreeView (a "view" component) that presented Animals (the model/class), you'd use an AnimalNode that both holds a reference to an Animal (exposing all it's properties) and has properties such as "IsSelected" (a view-centric property that needs to be stored somewhere, in this case on the view-model).
That's the high level... but to answer your question, yes it's a good idea to store data in instances of a class and then present that using a ui. I recommend loading all the data into an intermediate collection on a different thread, then call back to the main thread to present all that data in the view. Depending on the scenario, you may want to present the items in a streaming manner rather than after it's completely loaded (streaming = slower, but user gets first results faster).
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Pretty much any lengthy processing should be performed on a separate thread.
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I am using this code when for activated to get the URL address but the Messagebox keeps poping up when user clicked Yes or No.. why it's not returning? where is my mistake?
private void frmLinksEntry_Activated(object sender, EventArgs e)
{
string url_address = Clipboard.GetText();
if (url_address != string.Empty)
{
try
{
System.Uri xx = new Uri(url_address);
}
catch (FormatException exp)
{
return;
}
if (MessageBox.Show("Do you want to use the selected URL?", "Link", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{
txtURL.Text = url_address;
}
}
}
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You have shown a handler for the Activated event which will be called whenever the frmLinksEntry control receives focus. It's a bad idea to pop up a messagebox from the handler as this causes the control to lose and then regain focus. The Activated event fires again and the messagebox reopens etc etc etc.
Alan.
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but that's what i want, i mean when the user go to copy the URL from the browser then comes back to my application with the URL in clipboard and the frmLinksEntry active it should ask if he wants to use the copied URL?!
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If the URL you get from the clipboard is the same as the URL in the textbox, then do not show the dialog again.
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