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Hey Guys,
I'm working on a graphics app. There will be a form that allows the user to find/select a image from hundreds of stored art. My question is: How can I "load" hundreds of images effeciently? I know MS gives you a listviewbox to work with but it is terribly slow and cumbersome when dealing with so many images.
Popular graphics programs like PrintShop gives you hundreds of images in one area with seemingly no load time. Any tips on how to accomplish this?
Richard
may your code be error free.
(okay, maybe two lines.)
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HEllo,
Don't use a control!
Draw it directly on your Form, by using the "OnPaint" method and the given Graphics object (e.Graphics)!
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.DrawImage(...);
base.OnPaint (e);
}
All the best,
Martin
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If you want to show 'hundreds' of images, odds are you won't show them all at once. Caching them effectively and keeping them at the desired size is probably the main way to get good performance in this situation.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Hi all can anyone tell me how can we convert system date into different format like dd/mmm/yyyy or mm/dd/yyyy into for example '2007-10-25T11:47:10.515625+05:30' in c#.
Please response me soon.
I will very thankful for that..
Sincerly
Vishnu Narayan Mishra
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The tostring method on the datetime class.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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I don't where you will be using your custom format but this will get you on the right track.
C# includes some formmating directives for all sorts of data, including dates. Here's the syntax for a date:
yyy-MM-dd HH:mm-ss aa
produces:
2007-11-12 10:00:23 AM
Cheers,
Richard
may your code be error free.
(okay, maybe two lines.)
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I need a source which can check whether I have installed .Net framework 2.0 or not.
Thanks.
Nothing!! But gonzo!!
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You need to create a precondition in your setup project that checks to see if your version of the .net framework is installed. Your software won't install unless your precondition has been met. You don't need to write any code for this, it is the right way to do what you are talking about. It is a very, very easy and common task.
"If an Indian asked a programming question in the forest, would it still be urgent?" - John Simmons / outlaw programmer
I get all the news I need from the weather report - Paul Simon (from "The Only Living Boy in New York")
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You can write C++ code to do this, but not C#, for obvious reasons.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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You may have to explain this one to him. If he posted a question like this, it's apparent that he doesn't have the knowledge to understand the blindingly obvious.
Deja View - the feeling that you've seen this post before.
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Have you tried looking on Google or CP? There is at least one article[^] here that explains how to do this, and also gives you a reference to some C++ code that you will need to use if you are trying to do this from an installer.
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Why am I getting this compiler error: Use of possibly unassigned field 'PropertyToPropertyConstraints'
for this code:
public struct foobar<br />
{<br />
public readonly int[,] PropertyToPropertyConstraints;<br />
<br />
public foobar(int bar)<br />
{<br />
PropertyToPropertyConstraints[0, 0] = -1;<br />
}<br />
}
I'm sure there is something fundamental and basic I'm missing here, probably having to do with how I use the array. But the compiler error is confusing.
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well, you didn't say
PTPC = new int[x,x];
anywhere, you just started setting values.
My current favourite word is: PIE!
Good ol' pie, it's been a while.
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I'm not sure I follow.
Where would I say this? Initialization isn't allowed in the declaration (in a struct). Are you saying I would need to do this in the public constructor itself?
It's my understanding that fields are automatically initialized in a struct. For instance, my int's are all initialized. The int's in my int array are not?
Man, this struct stuff has me all confused.
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You were right, that was it. I needed to create the array in the public constructor. I had tried to create it in the declaration, been punished, and didn't think about creating it in the constructor, where I was assigning values. (My real code was a lot more complex than the example I used here, but I should have spotted it in the example).
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How can I convert a double to string with a [+] or a [-] sign symbol
for example I have:
double x = 500.12;
double y = -500.12;
I want x to be diplayed as:
+500.12
and y to be displayed as:
-500.12
Please help
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The negative number should come out with a - sign already.
So once you've used .ToString, if the first char isn't a '-' then put a '+' at the start:
double x = 500.12;
double y = -500.12;
string sX;
string sY;
sX = x.ToString();
if(!sX.StartsWith("-"))
sX = "+" + sX;
sY = y.ToString();
if(!sY.StartsWith("-"))
sY = "+" + sY;
Console.WriteLine(sX + "\n" + sY);
The output should be:
+500.12<br />
-500.12
My current favourite word is: PIE!
Good ol' pie, it's been a while.
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Thanks for the opportunity to look into this.
System.Console.WriteLine ( ( 500.12).ToString("+#.##;-#.##" ) ) ;
System.Console.WriteLine ( (-500.12).ToString("+#.##;-#.##" ) ) ;
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Works like a charm. Thanks.
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I create a dynamic table using the code below (c#), but I couldn't figure out how to set the column width (in column3 comments).
DataTable tbl;
DataColumn col;
tbl = new DataTable();
col = new DataColumn("column1");
tbl.Columns.Add(col);
col = new DataColumn("column2");
tbl.Columns.Add(col);
col = new DataColumn("column3 comments");
tbl.Columns.Add(col);
tbl.AcceptChanges();
DataRow r;
r = tbl.NewRow();
r["column1"] = "This is 1";
r["column2"] = "This is 2";
r["column3 comments"] = "Comments is really long & I need to set the width for this";
tbl.Rows.Add(r);
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Ummmm... I assume you mean when it's displayed somehow?
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yeh...when it display. i connect it to the datagrid, but i couldn't find a way to set the width of the column in there.
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I have developed application A,B and C that uses the same database. Because i need to be working at different places sometimes i found computers where i cannot connect to the database as i do in my house, so i was wondering how to have A,B and C in the same project so i can add the mdf file only to that big project instead of each individual project? Because the data from one application is important to the other!!!
Thanks all,
Luis E Tineo S
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Why do you need to add the mdf file to each individual project? Normally, what we used to do is that we have the database on SQL server, All applications which are using this database connect to this Server only.. We don't put the database file to each application and we don't install that database file on each client's machines..
Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)
"Please vote to let me (and others) know if this answer helped you or not. A 5 vote tells people that your question has been answered successfully and that I've pitched it at just the right level. Thanks."
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