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In WinForms (which this clearly isn't) you'd go for a virtual datagridview if the binding is too slow.
WPF might have something similar
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Is it the query or the binding to the ui that is causing the delay. Sounds like it is establishing the ODBC connection taking the bulk of the time!
Never underestimate the power of human stupidity
RAH
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Thank you for your answers. I think so too. I tried a bit and found a solution which needs 1.5 seconds.
DataSet ds = new DataSet();
DataTable dt = new DataTable();
NpgsqlConnection conn = new NpgsqlConnection("Server=localhost;User Id=xxx;" +
"Password=xxx;Database=xxx;");
conn.Open();
string query = "SELECT xxxx";
NpgsqlCommand cmd = new NpgsqlCommand(query, conn);
NpgsqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
data.Add(new Lagerteile() { ID = (int)dr["ID"], Kunde = dr["Name"].ToString(), Liefertermin = (DateTime)dr["Liefertermin"], WANr = dr["WaNr"].ToString(), Name = dr["Bezeichnung"].ToString(), Pos = dr["Pos"].ToString(), Stk = (int)dr["Stk"] });
conn.Close();
dg123.DataContext = data;
It seems to be very long because you could not work in that time. Is there a possibility to fill it in the background that you get a result directly ?
How can I refresh the DataGrid ? The problem is that for example an other client changed the database.
modified 26-Dec-15 10:43am.
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I am working on c# desktop application in visual studio 2013.
When i try to change startup form from program.cs file.It shows an exception.
Please help me to solve this issue.
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What exception are you getting?
This space for rent
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What is the exception?
Any message? Any inner exception?
Any code to give us a clue what you are doing?
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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1. What are you trying to do?
2. Why would you want to change that (startup object)?
3. Not entirely sure, but it's probably because it would need a static void Main()
Best,
John
-- LogWizard - a Log Viewer that is easy and fun to use!
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using this lib System.IO.Compression i want to compress file in multivolumen mode, compress large file in several small files.
i want to use .net library and not external lib.
thanks.
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That's nice. Good luck.
If it's not broken, fix it until it is
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but do you know how to do that??
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He probably does know how to do it, now that you mention it.
The difficult we do right away...
...the impossible takes slightly longer.
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What you're missing is that you haven't asked a question at all. You didn't say anything about what the problem your having, what you tried, what problems you ran into, ..., nothing at all.
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ok, my problem is this, i can compress/uncompress file using the lib system.io.compression, but i dont know how to do this using into multivolumen file, i mean i want to compress a large file into several small file. how can i do this using .net library?
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These smaller files, do they have to conform to a standard or can they just represent a large chunk of binary split into chunks? Also, what framework are you using (2,3,4 etc.) as they've added quit a bit to that namespace of late.
Regards,
Rob Philpott.
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easy i want to do the split into volumen size that winrar do. for example i have a file that have 200mb and i want to compress it into two file of 100mb.
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Hmm. OK, on the assumption that you are compressing one file, and that the separate chunk files are not expected to interop with things like WinZip or WinRar it would be fairly straight forward.
- Open the source file with a FileStream
- Chain a DeflateStream onto the filestream (just pass in constructor)
- Read from the deflate stream the number of bytes you want in your chunks (into byte array)
- Write entire byte array to individual file.
- Goto 3 (until end of filestream).
Going the other way is a bit more tricky, as you can't really create one stream from a set of files, but works in a similar fashion.
Regards,
Rob Philpott.
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finally someone, thanks i'll try waht you tell me. i dont know what its DeflateStream but i'll make a search on the net for it. if you any example i'll thanksful too.
and yes am compressing only one file.
thanks
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that class is what i want to use, but i don't know how to split a file in several file. someone can tell me how using zip class can split a single file into several file?
thanks
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Follow the link I gave you and read the documentation.
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look i had read the link you gave to me, but there i cant find how to split a file while compress it.
Zip class methods:
CreateFromDirectory(String, String)
CreateFromDirectory(String, String, CompressionLevel, Boolean)
CreateFromDirectory(String, String, CompressionLevel, Boolean, Encoding)
there is not a parameter where i can specify the volumen's size.
i don't know if cant explain clearly what i want but i'll try one more time.
i know how to zip/unzip using .net zip class, but i don't know how using .Net library split volume zip files. someone can just tell me how to do it, just a simply code, it cant be more than 3 line but i can find the parameter to do that.
thanks again.
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jackie.3981 wrote: how to split a file while compress it. Sorry, but I do not understand. Why would you want to split a file at the same time as you compress it?
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OK, let me explain again.
i made a soft that get data for a database and make and XML. that XML sometimes get more than 150mb and so but i need to send the XML by email. sometime with just a compression it fix by email but sometimes not, so i need that when the size is bigger that for example 100mb, make an split the zip file. its the same if you get the file and compress it with winrar using the option "split to volumes, size" but i want to do that in c# using if its possible zip class.
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Then you probably need to split the file into a set of new files and then zip those 'subfiles' into an archive. Or, maybe split the file and compress each part separately before emailing it to the recipient.
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i found this code in stackoverflow:
int SegmentsCreated ;
using (ZipFile zip = new ZipFile())
{
zip.UseUnicode= true;
zip.AddDirectory(@"MyDocuments\ProjectX");
zip.Comment = "This zip was created at " + System.DateTime.Now.ToString("G") ;
zip.MaxOutputSegmentSize = 100*1024 ;
zip.Save("MyFiles.zip");
SegmentsCreated = zip.NumberOfSegmentsForMostRecentSave ;
}
the line in bold make what i want but when i copy this code into VS get errors that i don't know how to fix it, so i try to get help to do this maybe in other way. I've made it using 7zip lib but i don't want to use external lib, i want to use .net library.
thanks.
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