C# Discussion Boards - CodeProject

KIDYA17-Jun-09 0:15

17-Jun-09 0:15

Helloo Experts!!

I want to calculate difference between two dates(Day) and display that differnce date like 12\02\09,
In short,
current date:12\02\09

Dispaly date;11\02\09

help me!! Sigh | :sigh:

Re: Calculate difference between two dates

OriginalGriff17-Jun-09 0:33

OriginalGriff

17-Jun-09 0:33

See Timespan class[^]

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Re: Calculate difference between two dates

Baran M17-Jun-09 0:36

Baran M

17-Jun-09 0:36

you can try this,

DateTime d1 = DateTime.Today;
DateTime d2 = DateTime.Today.AddDays(1);
TimeSpan ans = d2.Subtract(d1);

If I didn't get your problem plz explain it.

Education is not a way to escape poverty — it is a way of fighting it.

Re: Calculate difference between two dates

himanshu256117-Jun-09 0:38

himanshu2561

17-Jun-09 0:38

You can find lots of stuff on how to work with DateTime.
Check http://www.dotnetspider.com/forum/164678-date-difference-using-asp-net.aspx[^]

himanshu

System.Drawing.Image to IPicture and back changes the image

Sander123432117-Jun-09 0:09

Sander1234321

17-Jun-09 0:09

public new static object GetIPictureDispFromPicture(System.Drawing.Image image)
{

System.Drawing.ImageConverter converter2 = new System.Drawing.ImageConverter();

byte[] arraybyt2 = (byte[])converter2.ConvertTo(image, typeof(byte[]));

System.Drawing.Image imageToConvert = System.Windows.Forms.AxHost.GetPictureFromIPicture(System.Windows.Forms.AxHost.GetIPictureFromPicture(image));

System.Drawing.ImageConverter converter = new System.Drawing.ImageConverter();

byte[] arraybyt = (byte[])converter.ConvertTo(imageToConvert, typeof(byte[]));

return System.Windows.Forms.AxHost.GetIPictureFromPicture(image);

}

The function receives a Image that needs to be converted to an ipicture. I found out that during change the image to a ipicture and back to image the size of the array of bytes are different. How come the size of the arraybyt1 and arraybyt2 are different. I'm creating a checksum of the array from bytes and therefor the checksum is also different?

Re: System.Drawing.Image to IPicture and back changes the image

Henry Minute17-Jun-09 1:24

Henry Minute

17-Jun-09 1:24

I am not familiar with IPicture, and therefore this is very much a guess.

Perhaps Image stores data that IPicture doesn't, or vice versa. For example, different sized headers or one stores palette information and one doesn't.

Most image formats have their specifications out on the web somewhere, have a play with google.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
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“I want to report a fraud. The government is lying to us all.”

SQL Data type validation

jonhbt16-Jun-09 23:49

jonhbt

16-Jun-09 23:49

I need to create a method that accepts a string as a parameter and checks whether this parameter is a valid SQL Server datatype or not. Can someone help please?

thanks

Re: SQL Data type validation

himanshu256117-Jun-09 0:46

himanshu2561

17-Jun-09 0:46

Hi,
Change the method parameter from String to SqlDbType.

himanshu

Re: SQL Data type validation

PIEBALDconsult17-Jun-09 9:12

PIEBALDconsult

17-Jun-09 9:12

How about System.Enum.Parse ( typeof(System.Data.SqlDbType) , "datetime" , true ) ?

Re: SQL Data type validation

jonhbt17-Jun-09 23:12

jonhbt

17-Jun-09 23:12

thanks it worked fine for my application

Re: SQL Data type validation

PIEBALDconsult18-Jun-09 4:42

PIEBALDconsult

18-Jun-09 4:42

Glad to be of service.

C# XmlDocument Encoding

Samb198516-Jun-09 22:24

Samb1985

16-Jun-09 22:24

How can i load in a XmlDocument an xml file (from text file) that in the tag contain any type of char ? How can encode this ?

If my file contain char as "&" or "°" there is an exception (Xml.XmlException Errore durante l'analisi di EntityName).

I try with this but don't work:

Encoding enc = Encoding.ASCII;
FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.None);
StreamReader sr = new StreamReader(fs,enc);
string response = sr.ReadToEnd();
XmlDocument xml = new XmlDocument();
xml.LoadXml(response);
fs.Close();
sr.Close();

The exception is Xml.XmlException Errore durante l'analisi di EntityName.

Re: C# XmlDocument Encoding

SeMartens16-Jun-09 22:45

SeMartens

16-Jun-09 22:45

Well as far as I know it is not allowed to use all chars in entity-names. There is a strict rule for tag-names. Maybe you could post a bit of your xml-file, so that we can identify the problem.

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: C# XmlDocument Encoding

Samb198516-Jun-09 23:18

Samb1985

16-Jun-09 23:18

The problem isn't the tag-names but their content.

The exception occur when in the content of a tag (<tag> abc & avc n° ) there are particular char as & or °

Re: C# XmlDocument Encoding

SeMartens16-Jun-09 23:45

SeMartens

16-Jun-09 23:45

You could replace all special characters with their escape characters before reading the xml. Maybe this helps.

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: C# XmlDocument Encoding

Samb198516-Jun-09 23:47

Samb1985

16-Jun-09 23:47

How can i replace it ? can you give me an example of code ?

Re: C# XmlDocument Encoding

SeMartens16-Jun-09 23:53

SeMartens

16-Jun-09 23:53

Not the best method but maybe

response = response.Replace( "&", "&");

By the way, do you have an xml-declaration in your file (sort of <?xml version="1.0" encoding="UTF-8"?> )?

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: C# XmlDocument Encoding [modified]

Samb198517-Jun-09 0:00

Samb1985

17-Jun-09 0:00

I dont' have an xml-declaration...however if i add it there is always the same exception.

To use replace i must know all possible incorrect char... i would like to find a method valid for all possible char that may occur in the file.

Edit:
if i use utf8 encoding and replace of &, program work well with my current file xml.

I hope in future don't occur another char that create same problem. I think that & is properly of XML standard and so cause this exception.

modified on Wednesday, June 17, 2009 8:14 AM

Re: C# XmlDocument Encoding

PIEBALDconsult17-Jun-09 9:03

PIEBALDconsult

17-Jun-09 9:03

If the file doesn't contain a well-formed XML document you'll need to fix it.

Re: C# XmlDocument Encoding

Samb198517-Jun-09 9:19

Samb1985

17-Jun-09 9:19

For the moment i use utf8 encoding and replace all the & with &

What are the other possible char that may cause the Exception ?

Re: C# XmlDocument Encoding

PIEBALDconsult17-Jun-09 12:00

PIEBALDconsult

17-Jun-09 12:00

Less than < and greater than >

http://www.w3schools.com/xml/default.asp[^]

Abstract Class, constructors

dwadasi16-Jun-09 21:41

dwadasi

16-Jun-09 21:41

I am using abstract classes in my project, meanwhile i want to use overloaded Constructors to those classes, then how to call those overloaded constructors, because abstract classes cannot instantiate.
can any one please answer me?
Thanks in advance...

Re: Abstract Class, constructors [modified]

DaveyM6916-Jun-09 21:58

DaveyM69

16-Jun-09 21:58

An abstract class can have implementations though.

public abstract class BaseClass
{
    protected BaseClass()
    { }

    protected BaseClass(int id)
    {
        ID = id;
    }

    public int ID
    {
        get;
        private set;
    }

    public string Text
    {
        get;
        internal set;
    }
}

public class DerivedClass : BaseClass
{
    public DerivedClass() : base() { }

    public DerivedClass(int id) : base(id) { }

    public DerivedClass(int id, string text) : base(id)
    {
        Text = text;
    }
}

[Edit] Forgot to mark the abstract class's constructors as protected[/Edit]

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

modified on Wednesday, June 17, 2009 4:57 AM

Re: Abstract Class, constructors

PIEBALDconsult17-Jun-09 8:59

PIEBALDconsult

17-Jun-09 8:59

The same as calling any base class constructors?

problem with registering flormclosing event with button click event

prasadbuddhika16-Jun-09 21:31

prasadbuddhika

16-Jun-09 21:31

i'm try to register a formclosing event with a button click event but i get the error saying "Cannot assign to 'button1_Click' because it is a 'method group'"

this is the code i'm using

private void Form1_FormClosing(object sender,EventArgs e)
        {
            DialogResult ds = MessageBox.Show("exit?", "exit", MessageBoxButtons.YesNo);

            FormClosingEventArgs ee = (FormClosingEventArgs)e;

            if (ds == DialogResult.Yes)
            {
                ee.Cancel = false;
            }
            else
            {
                ee.Cancel = true;
            }
        }


 private void Form1_Load(object sender, EventArgs e)
        {
            button1_Click+= Form1_FormClosing;
        }

what might be the problem here ? Smile | :)

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