C# Discussion Boards - CodeProject

Re: How to show only 2 decimal points when using a double

0x3c015-Sep-09 5:32

15-Sep-09 5:32

As far as I know, the framework doesn't provide this explicitly. However, if you really must return a truncated string, then I've whipped up an extension method for you:

public static string ToDecimalPlace(this double i, int decimalPlaces)
{
    string toString = i.ToString();
    int decimalPoint = 0;

    if ((i % 1) == 0) //Is the number whole?
        return toString;
    decimalPoint = toString.IndexOf('.');
    // + 1 takes account of the zero-based index returned by IndexOf
    return toString.Substring(0, decimalPoint + decimalPlaces + 1);
}

I'm personally a little concerned about the strings being created, but I can't see a simple way around that problem. It will only usually show up under high load anyway. And remember to vet the input - this is only a proof of concept. If you do something like (8.1111111111111111111111111).ToDecimalPlace(840) you'll get an IndexOutOfRange exception.

OSDev

Re: How to show only 2 decimal points when using a double

J4amieC15-Sep-09 5:46

J4amieC

15-Sep-09 5:46

Computafreak wrote:
As far as I know, the framework doesn't provide this explicitly

double.ToString("F2")

Re: How to show only 2 decimal points when using a double

0x3c015-Sep-09 5:51

0x3c0

15-Sep-09 5:51

I've seen that. But when I declare a simple double variable, with a value identical to that of the OP, then call ToString("F2"), I simply get 57.00. It seems to round instead of truncate.

OSDev

Re: How to show only 2 decimal points when using a double

OriginalGriff15-Sep-09 6:24

OriginalGriff

15-Sep-09 6:24

Similar to the Computafreak solution, use an extension method:

public static double Truncate(this double d, int places)
    {
    double pow =  Math.Pow(10, places);
    return Math.Truncate(d * pow) / pow;
    }

You can then use myDouble.Truncate(2).ToString() with any formatting you want.

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Re: How to show only 2 decimal points when using a double

0x3c015-Sep-09 6:55

0x3c0

15-Sep-09 6:55

Wow, that's clever. I hadn't thought of doing that - it'll be filed away for future use. That's actually a lot better than mine as well, because it doesn't use strings.

For the OP, what this function does is move the decimal place right by the number of places you want to get. Then it strips off the rest of the decimal places on that number, and moves the decimal place back again, so that everything stays the same. The sequence of events, assuming you want to convert 1.23456789 to 1.234 is this:

1.23456789 -> 1234.56789
Truncate -> 1234
Divide again -> 1.234

OSDev

Re: How to show only 2 decimal points when using a double

OriginalGriff15-Sep-09 8:31

OriginalGriff

15-Sep-09 8:31

The benefits of age and experience! (Or, being an old fart has some advantages, then...) Laugh | :laugh:

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how to access and run method from main form without creating a new object instance of the form?

stan_lee2615-Sep-09 3:34

stan_lee26

15-Sep-09 3:34

Hello, I'm kind of new in C#. How i be able to access a method from my mainform from another form inside another project, but the same solution, without having to create a new object instance of the mainform?

for example, my mainform from project MainModule has a method to localize data, something like this:

public void LocalizeData(CultureInfo culture)
{
//codes here
}

How can i Access that from another project ModuleBody:

public void submit_click(Object sender, EventArgs e)
{
//How to access LocalizeData Method
}

Please help. Thanks.

Re: how to access and run method from main form without creating a new object instance of the form?

Keith Barrow15-Sep-09 4:18

Keith Barrow

15-Sep-09 4:18

If the code is common (ie the same in each case) create a new class with the localisation code in. You will almost certainly need to pass in the instance of the form you want to be localised.
e.g. [Psuedocode]

public class Localizer
{
  Form FormInstance { get; set; }

 public void LocalizeData(CultureInfo culture)
 {
   //code here e.g. FormInstance.Culture = culture or something.
 }


  public Localizer(Form formInstance)
  {
     FormInstance = fromInstace;
  }
}

Windows 7 - Install Windows Service

dataminers15-Sep-09 2:23

dataminers

15-Sep-09 2:23

I write windows service but I can't install it on windows 7.

What is the diffirentation between windows 7 and other windows OS when install windows service?

Re: Windows 7 - Install Windows Service

Mirko198015-Sep-09 2:27

Mirko1980

15-Sep-09 2:27

None, AFAIK.
What error are you getting? Are you sure you are using administrative privileges when istalling the service?

Re: Windows 7 - Install Windows Service

dataminers15-Sep-09 4:03

dataminers

15-Sep-09 4:03

I don't get any error. I install windows service using with installutil but I can't see my installed service in the windows services.

I use same code on different windows OS, its work.

Excel application object in automation add-in?

SRKSHOME15-Sep-09 2:01

SRKSHOME

15-Sep-09 2:01

Hi,
How do I get Excel Application object in automation add-in that is passed from VSTO Excel add-in 2003?
Thanks in Advance

How to improve preformance of drawing in c#

Member 33751415-Sep-09 1:33

Member 337514

15-Sep-09 1:33

HI,
In a special case in our project i have to draw around 180,000 rectangles on the window, Its taking almost 2 seconds to do it, and it has zoom and scrolling features too. Is there any way to impove the performance.

Thanks
ravi

Re: How to improve preformance of drawing in c#

Nuri Ismail15-Sep-09 1:47

Nuri Ismail

15-Sep-09 1:47

See Don't Flicker! Double Buffer![^] Smile | :)

Regards
Nuri Ismail

Re: How to improve preformance of drawing in c#

Luc Pattyn15-Sep-09 4:39

Luc Pattyn

15-Sep-09 4:39

double-buffering improves the visual experience, it does not really change the execution speed.

Smile | :)

Luc Pattyn

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Re: How to improve preformance of drawing in c#

Nuri Ismail15-Sep-09 4:59

Nuri Ismail

15-Sep-09 4:59

Thanks, I know that. Smile | :)

The OP was talking about zoom and scrolling features. I decided that double-buffering technique could greatly improve the visual experience when using these features.

Thanks
Nuri Ismail

Re: How to improve preformance of drawing in c#

musefan15-Sep-09 2:09

musefan

15-Sep-09 2:09

That is a lot of rectangles, are you by any chance using them to represent a grid? If so then you could try using lines to draw the grid, this would reduce the number of draws to ~900. If not a grid, then what needs so many rectangles?

Life goes very fast. Tomorrow, today is already yesterday.

Re: How to improve preformance of drawing in c#

Eddy Vluggen15-Sep-09 2:39

Eddy Vluggen

15-Sep-09 2:39

Perhaps you can draw it in a separate thread and pass the resulting picture back to be used as a background for the Window?

I are Troll Smile | :)

redirect to PHP page from C# code

Alaa Telfah15-Sep-09 1:32

Alaa Telfah

15-Sep-09 1:32

Hi for all
im now tring to redirect my project to PHP page from C# APP
and i used these lines (code):
// prepare the web page we will be asking for
HttpWebRequest request = (HttpWebRequest)
WebRequest.Create("http://localhost/d.php");

// execute the request
HttpWebResponse response = (HttpWebResponse)
request.GetResponse();

that executed my program without showing me a PHP page in my browser

and i used these lines also as my code

string targetURL = @"http://localhost/MyPage.php";
System.Diagnostics.Process.Start(targetURL);

and that run true but i prefer the first method to do that
So any help

Thanks in advance

Re: redirect to PHP page from C# code

SeMartens15-Sep-09 1:37

SeMartens

15-Sep-09 1:37

Hi,

the first method will not open a browser, because you are doing a http-request. This means you call the site like a browser. The second call opens the browser because the operating system will open the browser to handle the command (in this case an url) you passed.

For displaying the php-page within your app you could use the webbrowser-control.

Regards
Sebastian

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Convert The Layout Of The Application Between Arabic And English

Thaer Hamael15-Sep-09 1:20

Thaer Hamael

15-Sep-09 1:20

Hi All

I'm create a system of medium-sized
I want to be the system of bilingual Arabic and English
I want to do the work Mithod GENERAL Oqo Bmnadadtha screen present in the system
How Ostzia of change in the screen from right to left or vice versa
Has been used following code but all the screen using this code to close immediately after opening

if (Arbic)
{
Form.RightToLeft = RightToLeft.Yes;
Form.RightToLeftLayout = true;
}
else
{
Form.RightToLeft = RightToLeft.No;
Form.RightToLeftLayout = false;
}

thanks Rose | [Rose]

Thaer

Re: Convert The Layout Of The Application Between Arabic And English

Keith Barrow15-Sep-09 1:34

Keith Barrow

15-Sep-09 1:34

You should look at using Internationalization. This will greatly cut down the work you need to do.
This link[^] has a section on Arabic support. here[^]

Isolation Levels

scotlandc15-Sep-09 0:53

scotlandc

15-Sep-09 0:53

Hi,

Am trying to update a database, setting a datetime value to the value set on a datetimepicker, and every time I try it, I get the following error message

ERROR[HY000][DataDirect][ODBC Progress OpenEdge Wire Protocol driver][OPENEDGE]Statement not allowed in readonly isolation level (7671)

Is it possible to override this isolation level, and if so, please can someone point me in the right direction of how?

With thanks in advance

Scott

Thumbnail of minimized Form

Paw Jershauge15-Sep-09 0:39

Paw Jershauge

15-Sep-09 0:39

Does anyone know how to get an thumbnail of an Form thats Minimized Confused | :confused:

This code works ok when the form is normal or maximum size, but not when its minimized, or anything in front of it.

private Bitmap GetFormImage(Form formToCapture)
{
    Bitmap formImage = null;
    using (Graphics g = formToCapture.CreateGraphics())
    {
        formImage = new Bitmap(formToCapture.Size.Width, formToCapture.Size.Height, g);
        using (Graphics mg = Graphics.FromImage(formImage))
        {
            IntPtr dc1 = g.GetHdc();
            IntPtr dc2 = mg.GetHdc();
            BitBlt(dc2, 0, 0, formToCapture.ClientRectangle.Width, formToCapture.ClientRectangle.Height, dc1, 0, 0, 13369376);
            g.ReleaseHdc(dc1);
            mg.ReleaseHdc(dc2);
        }
    }
    return formImage;
}

Appreciate the help... Thumbs Up | :thumbsup:

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Re: Thumbnail of minimized Form

musefan15-Sep-09 1:21

musefan

15-Sep-09 1:21

You could try showing the form, get the image, and then minimize it again

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