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A suggested, have a google for covariance and contravariance. This is supported in some cases, if the type parameter is used in a read-only manner. IEnumerable<t> can be used covariantly, IList<t> can't.
You can make it work by declaring your method as:
void WorkWithData<t>(F<t> data) where T : A { ... }
The compiler may infer the appropriate specialization of WorkWithData for you. If not you'll have to call it like WorkWithData(testB);
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Hi,
What is the fastest way to convert string array to double array? Currently, I am doing this:
double[] arrDouble = new double[arrString.Length];
for(int i=0; i<arrString.Length; i++)
{
arrDouble[i] = double.Parse(arrString[i]);
}
Unfortunately, this is quite slow for big array (about 3 millions). I am looking for a way to improve it. There is a link talking about converting object to double. http://blogs.msdn.com/bclteam/archive/2005/02/11/371436.aspx[^].
You will see that double.Parse is really slow because the object need to be converted to string before pass it to double.Parse. However, it is not the case here. My array is already a string array. I did test using Convert.ToDouble and it doesn't improve the speed.
Any idea?
Thanks for any help.
Cheers 
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This will always be a O(n) operation, you can't get it any faster than this. Are you sure you need 3 million items at the same time?
regards
modified 12-Sep-18 21:01pm.
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Yeah, unfortunately 
Thanks though for your help. At least I know there is nothing I can do about it.
Cheers
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Just for curiosity. How long does it take to convert those 3 million items?
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12 years later and we still haven't heard back. I can see why they wanted to speed this up.
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I'm trying to do an drag and drop example but it failed.
my code is:
public partial class Form1 : Form
{
private String f;
public Form1()
{
InitializeComponent();
f = "D:\\Special";
String[] files = Directory.GetFiles( f );
foreach ( String fi in files )
{
listView1.Items.Add( fi );
}
}
private void listView1_ItemDrag( object sender, ItemDragEventArgs e )
{
DoDragDrop( new DataObject( DataFormats.FileDrop, ( ( ListViewItem ) e.Item ).Text ), DragDropEffects.Copy );
}
}
Please help me, it's very urgent.
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Check out this article[^].
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Expect everything to be hard and then enjoy the things that come easy. (code-frog)
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Thank you for it, but I've already read it, and I did the same but it didn't work with me, that's why I'm so confused.
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HI..
Im trying to move mails that have come into my inbox, that have a specific subject into a subfolder in my inbox. Im trying to do this using a c# application. Ive been working on this the whole day, cant seem to get it.
Also whenever i use the Folder.Folders methods i get a 'Microsoft.Office.Interop.Outlook.MAPIFolder.Folders' is a property but is used like a method error. this is how i use it:
Subfolder = namespace_.Application.Session.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderInbox).Folders("Requests");
Thanks
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Change
Subfolder = namespace_.Application.Session.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderInbox).Folders("Requests");to
Subfolder = namespace_.Application.Session.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderInbox).Folders["Requests"];
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Thank you!!! IT WORKS.. IT WORKS.. IT WORKS.
been struggling with it for days.
heres why i needed it: i have a web app which sends 'requests' these requests are than saved to a database and sends an email to the administrator notifying them that a new request has come in.
now the problem was that in my desktop app i used a timer to check inbox every couple of seconds.. and each time it would read the same message and say there is a new messge. so just wanted to move the request into their own folder so that when the inbox is checked there shouldnt be any new request as they would be in their own folder.
didnt want to mark them as unread!!
(hope this makes sense  ).
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It does make sense. Could you not have used an Inbox rule to accomplish the same thing?
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if i were using an inbox rule.. wouldnt i have had to go directly into outlook and make the rule? if so, thats what i was trying to avoid! whats the point of coding than? just wanted everything to be done without me going into outlook.
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My bad - for some reason, I was thinking you could do this with Exchange - but I can't find anything in there. Oh well - curse my faulty memory.
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In .Net 2003 I'm creating a simple text editor app using a rich textbox, a menu, a status bar and a toolbar.
Inside the Windows Form Designer generated code, it errors on this line
this.imageList1.ImageStream =
((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageList1.ImageStream")));
with the message
An unhandled exception of type 'System.Resources.MissingManifestResourceException'
occurred in mscorlib.dll
Additional information: Could not find any resources appropriate for the specified culture
(or the neutral culture) in the given assembly. Make sure "Form1.resources" was correctly embedded
or linked into assembly "Editor".
baseName: Form1 locationInfo: Samples.Editor.Form1 resource file name: Form1.resources assembly: Editor,
Version=1.0.3160.18184, Culture=neutral, PublicKeyToken=null
The toolbar gets its images from the ImageList. This was alll working up until a few moments ago. I changed a method relating to saving the file, and when I ran it again, it errored.
All the images are missing out of the image list. If I leave them out and run it, it works fine. If I readd the images and run it, it errors again.
Anyone know what it going on?
Everything makes sense in someone's mind
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Did you try to search on google?[^]
I Love T-SQL
"Don't torture yourself,let the life to do it for you."
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No I didn't because I wasn't sure what part of that redicoulsy long message to search for. Add to that the message is typically cryptic of all MS errors, so it's hard to know WTF it's talking about.
Finally, the article at the link you pointed me to speaks of the problem stemming from changing the name of a class. I have not changed any names in my project.
Everything makes sense in someone's mind
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Have you tried .NET 2.0 or 3.0? Microsoft gives away a free version a VS 2008.
Chuck Norris has the greatest Poker-Face of all time. He won the 1983 World Series of Poker, despite holding only a Joker, a Get out of Jail Free Monopoloy card, a 2 of clubs, 7 of spades and a green #4 card from the game UNO.
In the movie "The Matrix", Chuck Norris is the Matrix. If you pay close attention in the green "falling code" scenes, you can make out the faint texture of his beard.
Chuck Norris actually owns IBM. It was an extremely hostile takeover.
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AKA, what can I do to decrease the friction.
I probably spend on average 2 to 3 hours of a 40 hour work week struggling with windows-b-crazy problems. Locked up software, processes taking far too long to start-up/shut down, interminable restarts, etc etc etc.
In your experience is this average? I'm really feeling the frustration and if I can do something about it I would love to.
I am running Windows XP sp2, and our company sysadmin is unlikely to let me go to anything else. Either way, I am a constant user of VS2008, VS2003 (usually have 2 or 3 of those open) and Toad so even if I switched I would have to have windows open in a virtual machine which I don't think would be of any real advantage.
Also I could request a computer upgrade but I know little enough about hardware that I wouldn't know what to recommend, I've already got an Intel dual core with 2.66GHz and 2 gig of RAM and my mem/CPU usage is rarely at 100%.
Any ideas?
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Wrong Forum
Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.
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whoops, thought I was in the lounge
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Exactly zero. And I use vista.
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As I'm not a glazier, none.
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One who sets glass? Seriously, I would love to fix this, but its not one problem just a general crappiness so I don't even know where to start.
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