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I like ListBox a lot as it is line-oriented and knows to handle millions of lines pretty well. Here[^] is a typical use.
When necessary, I make it UserDrawn so I can have more control on formatting (quite often all I need is some text lines in bold and/or a different color).
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thanks, but i need multi-column control... so, listbox will not be helpfull
ISQ 469907496
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again, OwnerDrawn allows for lots of formatting. I've done columnar output with ListBox. You can make it look like a DataGridView (without the column sort facilities).
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ok, i'll try, but i'm really not sure that this implementation will be faster than listview virtual mode...
ISQ 469907496
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whatever control you choose, performance will depend very much on how you use it. If your control is large, and you are adding/updating/scrolling it all the time, then those actions will end up consuming almost all available CPU cycles. You may want to look at:
- SuspendLayout/ResumeLayout
- AddRange
- only updating TopIndex at regular intervals (say with a 1-second periodic timer).
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Hello.
In the project i am working on i am face these days with the task of creating a p7m file.
I have at my disposal the following :
- Public key Certificate in Base64
- Signature in Base64
- The file in byte array.
I cannot seem to find a way to create a p7m file with a already existing signature.
Could i please get some help if anyone bumped into this issue ?
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I have been doing some playing with a generic print class to add header/footer/lefter/righter support, so have been implementing my own print preview. But for some reason, it seemed really sluggish. When I switch orientation from Landscape to Portrait, it could take a noticeable time - maybe half a second, or more. So, I filled the routine with Stopwatch tests, and got some odd results. Create a new C# Winforms project and drop a button on, hook up this code:
using System;
using System.Windows.Forms;
using System.Drawing.Printing;
using System.Diagnostics;
namespace PrintTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
TimeIt();
}
private static void TimeIt()
{
PrintDocument pd = new PrintDocument();
Stopwatch sw = new Stopwatch();
TimeSpan ts1 = new TimeSpan(0);
TimeSpan ts2 = new TimeSpan(0);
TimeSpan ts3 = new TimeSpan(0);
sw.Start();
int Width;
PageSettings pageSettings = pd.DefaultPageSettings;
ts1 = sw.Elapsed;
PaperSize ps = pageSettings.PaperSize;
ts2 = sw.Elapsed;
Width = ps.Width;
ts3 = sw.Elapsed;
sw.Stop();
MessageBox.Show(sw.Elapsed +
"\n ts1: " + ts1 +
"\n ts2: " + ts2 +
"\n ts3: " + ts3);
}
private void button1_Click(object sender, EventArgs e)
{
TimeIt();
}
}
}The first time the message appears, it is slow as I expect - assemblies loading, etc. But it remains consistant after that.
I get numbers such as:
00:00:00.2231302
ts1: 00:00:00.0000010
ts2: 00:00:00.2231289
ts3: 00:00:00.2231297 Which means that this line of code takes 0.2 seconds:
PaperSize ps = pageSettings.PaperSize;
And testing show that it is 0.2 seconds each and every time you use it. So if your code looks like:
Width = page.Document.DefaultPageSettings.PaperSize.Width;
Height = page.Document.DefaultPageSettings.PaperSize.Height;
That takes 0.4 seconds.
But here's the rub: It only takes time if it is a networked printer. Local, or PDF printers don't take any significant time.
Is this just me?
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
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Hi Griff,
OriginalGriff wrote: Is this just me?
You can breathe again, it is not just you.
In my experiments the line "PaperSize ps = pageSettings.PaperSize;" takes:
- 800 msec the very first time my app runs on Vista (and a dual-core)
- 280 msec later on (same app executing it again, or same app restarted)
- 300 msec the very first time my app runs on Win7 (different machine, comparable CPU power, well, actually a quad-core but I won't believe that is a factor)
- 130 msec later on
This once again proves complex dereferencing such as
Width = page.Document.DefaultPageSettings.PaperSize.Width;
Height = page.Document.DefaultPageSettings.PaperSize.Height;
is to be avoided. I suggest
PageSettings dps=page.Document.DefaultPageSettings;
Size pSize=dps.PaperSize;
Width=pSize.Width;
HeightpSize.Height;
That is the "one period per sentence" rule!
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Thanks Luc, I thought I was going slightly mad.
Now try it to a non-network printer and see those times drop like a stone!
I've done a bit more Googling, and it seems this is an old-but-known feature of XP / Vista
Luc Pattyn wrote:
PageSettings dps=page.Document.DefaultPageSettings;
Size pSize=dps.PaperSize;
Width=pSize.Width;
HeightpSize.Height;
This is the way I would normally write it - I don't trust compiler optimisers to spot commonality like that... 
What I will actually do is cache the PaperSize info as part of my class and reload when the user changes the printer settings.
It was just such a silly result that I wanted to check I hadn't suddenly lost the plot - it is Monday, after all!
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
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OriginalGriff wrote: I don't trust compiler optimisers to spot commonality like that.
The compiler would have a hard time at optimizing this. While most properties are supposed to return the same value each time, the language spec does not enforce this. So your Document, DefaultPageSettings, and PaperSize need to be fetched each time, unless code analysis (or some attribute?) of said properties tells otherwise.
I'm not going to test a local printer, I only have the one (networked) printer in my current set-up.
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I cannot find a significant difference between our HP Color LaserJet (net work) and Microsoft XPS Document Writer (local) on Windows 7. Re-running the program several times gets a list of quite variant results even for one type...
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Is there any way to keep control in front of another one at all times? I've been searching for quite a while and I've found nothing that really works. I've also tried with BringToFront method whenever the control beneath it gets focused and it doesn't really work as I want it to.
Thanks in advance!
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Change it's z-order.
.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001
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Already tried, doesn't work, because as soon as user actives the control below, parts of it come in front.
I changed the z-order by writing
this.Controls.SetChildIndex(myControl, 0);
Do you know any other way?
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But does the control that's on top become obstructed by the control beneath it?
I've given it some though and I can't come up with a reason to do what you're doing. If you want to hide some controls based on conditions in the form, just hide 'em or disable 'em.
.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001
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I doubt there will be a solution; anyway you probably didn't provide enough details here.
if the bottom control supports interaction, e.g. it is a TextBox and is enabled, then it not coming to the front would normally considered bad. So what is it that you want enabled and not topmost when activated?
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It's a Panel on top of ScrollableControl. I have painted a custom "toolbar" on my form (it's just a drawing, not a control), and I want to add shadow to it. To achieve a look as if drawings in ScrollableControl are going under the toolbar-drawing, I need to separate the shadow into a control and put over it. The shadow-panel is 2 pixels high, has transparent background and has 2 black lines with different alpha value painted on it. Adding the shadow to the ScrollableControl instead of to the form doesn't work, because vertical scrollbar gets over the shadow (gets focused) and I'd also have to keep the shadow steady on scrolling (every control you put inside ScrollableControl will get scrolled).
It's the least important thing, but I always like to add some eye-candy to my applications.
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I'm not an eye candy specialist, however if memory serves, the way to go is by having your regular Control in the back, and a special transparent panel on top of that. You paint whatever it takes on the panel, and teach it to sit in front visually, while being invisible to all mouse operations, so it clicks through. I did something similar once, long ago, however I don't remember every detail.
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I know I'm asking a lot, but could you please try to write an example code how to keep a control in front visually and how to make it click-through-able?
Thanks in advance!
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Sorry no, it was really long ago, and I don't want to go there again.
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I hope you can give me at least a hint in the right direction... Was it win32-like code or just overriding some functions? I'm more interested in how to keep a panel visually in front at all times. Thanks for the help.
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1. make sure the background control (ListBox, whatever) and the foreground control (Panel) both have the Form as their parent.
(If you were to use Visual Dersigner, and simply add the background control first, then a smaller foreground Control on top of it, it would be a child of the background, not of the form).
One way of doing that is: position it outside the background color, select it, goto properties, and type a new location value.
2. at run-time, never move the controls, never change their Z-order. Let them as they are.
3. in as much as the foreground control must be transparent (visually) and must ignore the mouse (click-through), do whatever that takes (Enabled=false; for starters).
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hi,
in my MDI application suppose i have combo on one of my child form and now i want to populate that combo with all the form name whether any form is closed or opened.how can i do this by c# code. i search Google but found nothing. please help me with code.
thanks
tbhattacharjee
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You'd need to use reflection to search through all the classes in your application, and check to see if it was a form or not. If it's a form, you can then retrieve the IsMdiContainer property and see if it's true or not - if it's true, then this is the MDI parent.
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Hi there
i want to install some fonts; when i detect it is deleted. my code works fine on XP. but in win7 it is deleted immediately. i think it is beacause of UAC and use fileiopermission and demand with no lock. even i use right click run as administrator. so any suggestion is appreciated. sorry for my English.
Best wishes
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