C# Discussion Boards - CodeProject

Old Gun20-Nov-04 21:06

20-Nov-04 21:06

Thanks a lot!

this my code
DataGridTimePickerColumn tpcsCreatedDate = new DataGridTimePickerColumn();
tpcsCreatedDate.MappingName = "CreatedDate";
tpcsCreatedDate.HeaderText = "CreatedDate";
tpcsCreatedDate.NullText = DateTime.Now.ToShortDateString();
myGridStyle.GridColumnStyles.Add(tpcsCreatedDate);

this is DataGridTimePickerColumn from msdn
using System;
using System.Data;
using System.Windows.Forms;
using System.Drawing;

// This example shows how to create your own column style that
// hosts a control, in this case, a DateTimePicker.
public class DataGridTimePickerColumn : DataGridColumnStyle
{
private DateTimePicker myDateTimePicker = new DateTimePicker();
// The isEditing field tracks whether or not the user is
// editing data with the hosted control.
private bool isEditing;

public DataGridTimePickerColumn() : base()
{
myDateTimePicker.Visible = false;
}

protected override void Abort(int rowNum)
{
isEditing = false;
myDateTimePicker.ValueChanged -=
new EventHandler(TimePickerValueChanged);
Invalidate();
}

protected override bool Commit
(CurrencyManager dataSource, int rowNum)
{
myDateTimePicker.Bounds = Rectangle.Empty;

myDateTimePicker.ValueChanged -=
new EventHandler(TimePickerValueChanged);

if (!isEditing)
return true;

isEditing = false;

try
{
DateTime value = myDateTimePicker.Value;
SetColumnValueAtRow(dataSource, rowNum, value);
}
catch (Exception)
{
Abort(rowNum);
return false;
}

Invalidate();
return true;
}

protected override void Edit(
CurrencyManager source,
int rowNum,
Rectangle bounds,
bool readOnly,
string instantText,
bool cellIsVisible)
{
DateTime value = (DateTime)
GetColumnValueAtRow(source, rowNum);
if (cellIsVisible)
{
myDateTimePicker.Bounds = new Rectangle
(bounds.X + 2, bounds.Y + 2,
bounds.Width - 4, bounds.Height - 4);
myDateTimePicker.Value = value;
myDateTimePicker.Visible = true;
myDateTimePicker.ValueChanged +=
new EventHandler(TimePickerValueChanged);
}
else
{
myDateTimePicker.Value = value;
myDateTimePicker.Visible = false;
}

if (myDateTimePicker.Visible)
DataGridTableStyle.DataGrid.Invalidate(bounds);
}

protected override Size GetPreferredSize(
Graphics g,
object value)
{
return new Size(100, myDateTimePicker.PreferredHeight + 4);
}

protected override int GetMinimumHeight()
{
return myDateTimePicker.PreferredHeight + 4;
}

protected override int GetPreferredHeight(Graphics g,
object value)
{
return myDateTimePicker.PreferredHeight + 4;
}

protected override void Paint(Graphics g,
Rectangle bounds,
CurrencyManager source,
int rowNum)
{
Paint(g, bounds, source, rowNum, false);
}
protected override void Paint(
Graphics g,
Rectangle bounds,
CurrencyManager source,
int rowNum,
bool alignToRight)
{
Paint(
g,bounds,
source,
rowNum,
Brushes.Red,
Brushes.Blue,
alignToRight);
}
protected override void Paint(
Graphics g,
Rectangle bounds,
CurrencyManager source,
int rowNum,
Brush backBrush,
Brush foreBrush,
bool alignToRight)
{
DateTime date = (DateTime)
GetColumnValueAtRow(source, rowNum);
Rectangle rect = bounds;
g.FillRectangle(backBrush,rect);
rect.Offset(0, 2);
rect.Height -= 2;
g.DrawString(date.ToString("d"),
this.DataGridTableStyle.DataGrid.Font,
foreBrush, rect);
}

protected override void SetDataGridInColumn(DataGrid value)
{
base.SetDataGridInColumn(value);
if (myDateTimePicker.Parent != null)
{
myDateTimePicker.Parent.Controls.Remove
(myDateTimePicker);
}
if (value != null)
{
value.Controls.Add(myDateTimePicker);
}
}

private void TimePickerValueChanged(object sender, EventArgs e)
{
this.isEditing = true;
base.ColumnStartedEditing(myDateTimePicker);
}
}

please give me some more help!

How to perform carriage return by coding,not by clicking the Enter key?

momer18-Nov-04 16:04

momer

18-Nov-04 16:04

I invoked the format command of OS(XP) in my code.But evry time it display a console window and I have to click the Enter key to go on the function. So,I wonder if there is a way to perform carriage return automatically and we do not need to click the Enter key?
Thanks for help!

Re: How to perform carriage return by coding,not by clicking the Enter key?

Daniel Turini18-Nov-04 20:41

Daniel Turini

18-Nov-04 20:41

You can either use the SendKeys class or redirect the input/output of the cmd.exe process you launched.

Yes, even I am blogging now!

Re: How to perform carriage return by coding,not by clicking the Enter key?

Luis Alonso Ramos19-Nov-04 9:03

Luis Alonso Ramos

19-Nov-04 9:03

Have you tried?

echo. | format a:

I don't know if it'll work, but give it a try. It's old DOS redirection, you are redirecting the ouput of the ECHO command (a carraige return) to the input of the FORMAT command.

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

datagrid slow updating

bwagz18-Nov-04 14:21

bwagz

18-Nov-04 14:21

Hi,

Sometimes the datagrid control is updating very slowly for some reason. In my program i have these circle objects and whenever the user clicks on one, the following occurs:

1. I create new DataRows for information contained in the circle clicked.

2. The rows are added to the DataTable bounded by the DataGrid.

3. When a different circle is clicked, the DataTable clears and the following steps are repeated.

The delay only seems to occur when a circle is clicked for the first time, each initial circle clicked on seems to update without a hitch.

Is this a cache issue? Thanks for the help!

Brian

ArrayList in ArrayList

stumpi18-Nov-04 13:52

stumpi

18-Nov-04 13:52

Hello!

I´m new to C# and have a question for the pro's.

Is it possible to put an ArrayList into another ArrayList like a 2d array?
How would the code look like?

Regards.

stumpi

Re: ArrayList in ArrayList

maibuihuynhtg18-Nov-04 16:43

maibuihuynhtg

18-Nov-04 16:43

ArrayList list1 = new ArrayList();
ArrayList list2;
for (int i=0; i< 2 ;++i)
{
list2 = new ArrayList();
list2.Add(i);
list1.Add(list2);
}

Overriding soap interpretation of specific types

WildRide18-Nov-04 13:32

WildRide

18-Nov-04 13:32

Not sure if this is a stupid problem.
I have a C# ASP.NET app that is consuming web services from third party product.
Problem is this third party prog is using some odd formats for passing back certain types.

Examples
A bool value will return either “true” or <null>
A date/time stamp will have the letter “T” inserted in the string before the time component.

.NET’s default SOAP interpretation is having problem with these types and the third party product is kind of a black box.

Sticking in an override for handling of these types at the .NET end would be ideal, but I’m kind of shooting blind on where to start.

Has anyone run across an issue like this before?

WR

Re: Overriding soap interpretation of specific types

steve_hocking19-Nov-04 3:23

steve_hocking

19-Nov-04 3:23

Have a look around the net/CodeProject/MSDN for information on SOAP Extensions. These allow you to do various things with SOAP packets before and after serialization and deserialization.

If you have, or can lay hands on "Developing XML Web Services and Server Components with Visual Basic .NET and Visual C# .NET" (ISBN 0-7356-1586-1) they are explained on page 446.

Failing that use these keywords:

AfterDeserialize
AfterSerialize
BeforeDeserialize
BeforeSerialize
SoapExtension

I realize this is only a push in the right direction, but it is a large-ish topic.

Cheers, Steve

How can i get the ID3 info on MP3s

visiontec18-Nov-04 13:30

visiontec

18-Nov-04 13:30

How can i get all the relavant info from an MP3 file using C#?
like the ID3 tag and the other MPEG info?

And also how can i edit it?

VisionTec

Re: How can i get the ID3 info on MP3s

Leon van Wyk18-Nov-04 22:07

Leon van Wyk

18-Nov-04 22:07

This is not perfect but it works.

<br />
<br />
namespace id3 {<br />
<br />
  using System;<br />
  using System.IO;<br />
  using System.Text;<br />
  <br />
  class FileCommands <br />
  {<br />
<br />
    public static void GetMP3Tag (ref MP3 paramMP3) <br />
	{<br />
		try<br />
		{<br />
			// Read the 128 byte ID3 tag into a byte array<br />
			FileStream oFileStream;<br />
			oFileStream = new FileStream(paramMP3.fileComplete , FileMode.Open);<br />
			byte[] bBuffer = new byte[128];<br />
			oFileStream.Seek(-128, SeekOrigin.End);<br />
			oFileStream.Read(bBuffer,0, 128);<br />
			oFileStream.Close();<br />
  <br />
			// Convert the Byte Array to a String<br />
			Encoding  instEncoding = new ASCIIEncoding();   // NB: Encoding is an Abstract class<br />
			string id3Tag = instEncoding.GetString(bBuffer);<br />
  <br />
<br />
<br />
			// If there is an attched ID3 v1.x TAG then read it <br />
			if (id3Tag .Substring(0,3) == "TAG") <br />
			{<br />
				paramMP3.id3Title       = id3Tag.Substring(  3, 30).Trim();<br />
				paramMP3.id3Artist      = id3Tag.Substring( 33, 30).Trim();<br />
				paramMP3.id3Album       = id3Tag.Substring( 63, 30).Trim();<br />
				paramMP3.id3Year        = id3Tag.Substring( 93, 4).Trim();<br />
				paramMP3.id3Comment     = id3Tag.Substring( 97,28).Trim();<br />
<br />
<br />
<br />
				// Get the track number if TAG conforms to ID3 v1.1<br />
				if (id3Tag[125]==0)<br />
					paramMP3.id3TrackNumber = bBuffer[126];<br />
				else<br />
					paramMP3.id3TrackNumber = 0;<br />
<br />
				paramMP3.id3Genre = bBuffer[127];<br />
				paramMP3.hasID3Tag     = true;<br />
				// ********* IF USED IN ANGER: ENSURE to test for non-numeric year<br />
			}<br />
			else <br />
			{<br />
				// ID3 Tag not found so create an empty TAG in case the user saces later<br />
				paramMP3.id3Title       = paramMP3.fileFileName.Substring(0,paramMP3.fileFileName.LastIndexOf("."));<br />
				paramMP3.id3Artist      = "";<br />
				paramMP3.id3Album       = "";<br />
				paramMP3.id3Year        = "";<br />
				paramMP3.id3Comment     = "";<br />
				paramMP3.id3TrackNumber = 0;<br />
				paramMP3.id3Genre       = 0;<br />
				paramMP3.hasID3Tag      = false;<br />
			}<br />
		}<br />
		catch<br />
		{<br />
			// ID3 Tag not found so create an empty TAG in case the user saces later<br />
			paramMP3.id3Title       = paramMP3.fileFileName.Substring(0,paramMP3.fileFileName.LastIndexOf("."));<br />
			paramMP3.id3Artist      = "";<br />
			paramMP3.id3Album       = "";<br />
			paramMP3.id3Year        = "";<br />
			paramMP3.id3Comment     = "";<br />
			paramMP3.id3TrackNumber = 0;<br />
			paramMP3.id3Genre       = 0;<br />
			paramMP3.hasID3Tag      = false;<br />
		}<br />
    }<br />
  <br />
    public static void UpdateMP3Tag (ref MP3 paramMP3) {<br />
      // Trim any whitespace<br />
      paramMP3.id3Title   = paramMP3.id3Title.Trim();<br />
      paramMP3.id3Artist  = paramMP3.id3Artist.Trim();<br />
      paramMP3.id3Album   = paramMP3.id3Album.Trim();<br />
      paramMP3.id3Year    = paramMP3.id3Year.Trim();<br />
      paramMP3.id3Comment = paramMP3.id3Comment.Trim();<br />
  <br />
      // Ensure all properties are correct size<br />
      if (paramMP3.id3Title.Length > 30)   paramMP3.id3Title    = paramMP3.id3Title.Substring(0,30);<br />
      if (paramMP3.id3Artist.Length > 30)  paramMP3.id3Artist   = paramMP3.id3Artist.Substring(0,30);<br />
      if (paramMP3.id3Album.Length > 30)   paramMP3.id3Album    = paramMP3.id3Album.Substring(0,30);<br />
      if (paramMP3.id3Year.Length > 4)     paramMP3.id3Year     = paramMP3.id3Year.Substring(0,4);<br />
      if (paramMP3.id3Comment.Length > 28) paramMP3.id3Comment  = paramMP3.id3Comment.Substring(0,28);<br />
      <br />
      // Build a new ID3 Tag (128 Bytes)<br />
      byte[] tagByteArray = new byte[128];<br />
      for ( int i = 0; i < tagByteArray.Length; i++ ) tagByteArray[i] = 0; // Initialise array to nulls<br />
  <br />
      // Convert the Byte Array to a String<br />
      Encoding  instEncoding = new ASCIIEncoding();   // NB: Encoding is an Abstract class // ************ To DO: Make a shared instance of ASCIIEncoding so we don't keep creating/destroying it<br />
      // Copy "TAG" to Array<br />
      byte[] workingByteArray = instEncoding.GetBytes("TAG"); <br />
      Array.Copy(workingByteArray, 0, tagByteArray, 0, workingByteArray.Length);<br />
      // Copy Title to Array<br />
      workingByteArray = instEncoding.GetBytes(paramMP3.id3Title);<br />
      Array.Copy(workingByteArray, 0, tagByteArray, 3, workingByteArray.Length);<br />
      // Copy Artist to Array<br />
      workingByteArray = instEncoding.GetBytes(paramMP3.id3Artist);<br />
      Array.Copy(workingByteArray, 0, tagByteArray, 33, workingByteArray.Length);<br />
      // Copy Album to Array<br />
      workingByteArray = instEncoding.GetBytes(paramMP3.id3Album);<br />
      Array.Copy(workingByteArray, 0, tagByteArray, 63, workingByteArray.Length);<br />
      // Copy Year to Array<br />
      workingByteArray = instEncoding.GetBytes(paramMP3.id3Year);<br />
      Array.Copy(workingByteArray, 0, tagByteArray, 93, workingByteArray.Length);<br />
      // Copy Comment to Array<br />
      workingByteArray = instEncoding.GetBytes(paramMP3.id3Comment);<br />
      Array.Copy(workingByteArray, 0, tagByteArray, 97, workingByteArray.Length);<br />
      // Copy Track and Genre to Array<br />
      tagByteArray[126] = paramMP3.id3TrackNumber;<br />
      tagByteArray[127] = paramMP3.id3Genre;<br />
  <br />
      // SAVE TO DISK: Replace the final 128 Bytes with our new ID3 tag<br />
      FileStream oFileStream = new FileStream(paramMP3.fileComplete , FileMode.Open);<br />
      if (paramMP3.hasID3Tag)<br />
          oFileStream.Seek(-128, SeekOrigin.End);<br />
      else<br />
          oFileStream.Seek(0, SeekOrigin.End);<br />
      oFileStream.Write(tagByteArray,0, 128);<br />
      oFileStream.Close();<br />
      paramMP3.hasID3Tag  = true;<br />
    }<br />
  <br />
  }<br />
  <br />
  struct MP3 <br />
  {<br />
      public string  filePath;<br />
      public string  fileFileName;<br />
      public string  fileComplete;<br />
      public bool    hasID3Tag;<br />
      public string  id3Title;<br />
      public string  id3Artist;<br />
      public string  id3Album;<br />
      public string  id3Year;<br />
      public string  id3Comment;<br />
      public byte    id3TrackNumber;<br />
      public byte    id3Genre;<br />
      <br />
	  public override string ToString()<br />
	  {<br />
		  return id3Title;<br />
	  }<br />
      // Required struct constructor<br />
      public MP3(string path, string name) <br />
	  {<br />
        this.filePath     = path;<br />
        this.fileFileName = name;<br />
        this.fileComplete = path + "\\" + name;<br />
        this.hasID3Tag    = false;<br />
        this.id3Title   = null;<br />
        this.id3Artist    = null;<br />
        this.id3Album   = null;<br />
        this.id3Year    = null;<br />
        this.id3Comment   = null;<br />
        this.id3TrackNumber = 0;<br />
        this.id3Genre   = 0;<br />
    }<br />
  } <br />
}<br />
<br />
<br />

Leon v Wyk

Overriding Object.Equals; Overriding Object.GetHashCode

McClamm18-Nov-04 12:07

McClamm

18-Nov-04 12:07

This is a purely theoretical question--I'm not even asking for help this time.

I've been working a bunch with some clever datastructures and I have found myself needing to provide Equals overrides so that when I use Contains a correct comparison is used to determine whether elements are inside a datastructure.

Anyway, when you override Equals, you have to override GetHashCode. Why exactly is this? Is it that the default Equals behavior involves comparison of hash numbers for the objects being compared? I always thought that the default Equals was just comparison of addresses. Maybe it's my java experience bubbling over.

On this topic, if we do not know exactly how Microsoft/.NET's default implementation of GetHashCode operates, when we write our own implementations of GetHashCode isn't it possible that we could... well... really muck things up? It just seems like we would want the same hashing behavior for ANY kind of object.

vir·tu·al re·al·i·ty
n. Abbr. VR

A computer simulation of a real or imaginary universe in which Microsoft APIs are thoroughly documented and behave in an entirely logical manner.

Re: Overriding Object.Equals; Overriding Object.GetHashCode

Daniel Turini18-Nov-04 20:45

Daniel Turini

18-Nov-04 20:45

McClamm wrote:
Anyway, when you override Equals, you have to override GetHashCode. Why exactly is this?
Two identical objects (x.Equals(y) == true) should return the same hashcode. If you fail to do it, you won't be able to use this object as a key on a Hashtable. Think about the string class: two different string instances, with identical chars, are equal (x.Equals(y) == true), and they return the same GetHashCode(), so they can be used as a key on a Hashtable.
Often, when you override Equals, you simply compare a field (or a combination of fields). Simply return the hashcode of this field, and probably you're done.

Yes, even I am blogging now!

Declaring arrays of class objects

Steve Searcy18-Nov-04 9:20

Steve Searcy

18-Nov-04 9:20

I am a new programmer in C#, so I hope there is an easy answer for this problem.

I need to declare an array of class objects, and the code compiles fine, but I always get the runtime exception "Object reference not set to an instance of an object." When I single step through the code, the exception is thrown when the array declaration statement is executed. I have tried the same declaration, but for a single instance rather than an array, and it works fine. I can step through the constructor and see that all the variable are created properly.

Below are the two statements that I have used. I try the array declaration, and it bombs. The single instance works great. Any suggestions on what I am doing wrong? I can provide more details if needed.

Parameter[] yearsArray = new Parameter[yearsOfData];
Parameter yearArray = new Parameter();

Steve

Re: Declaring arrays of class objects

Daniel Turini18-Nov-04 10:05

Daniel Turini

18-Nov-04 10:05

Steve Searcy wrote:
Parameter[] yearsArray = new Parameter[yearsOfData];
This declares an array. All items on the array are null (yearsArray[0], yearsArray[1]... yearsArray[yearsOfData]).
You need to assign new instances to them in a loop.

Yes, even I am blogging now!

DataGrid Header in Windows Application

Hamada_star18-Nov-04 6:28

Hamada_star

18-Nov-04 6:28

hi how to control in a datagrid header .....
i mean want to add aheader to group of columns
suppose u have "First Name","Last Name" headers and u want to group them under a toal header "Personal Information" for example..

does any one kow how to do that !!??

C# Datagrid Separate Column Header Font Colors

StyleGuide18-Nov-04 5:13

StyleGuide

18-Nov-04 5:13

Hi All,

With my datagrid I want different Column Headers to have different Colors?

There are global settings e.g

tableStyle.HeaderFont = Color.Green;

but I'm after soming like :

tableStyle.Columns[1].HeaderFont = Color.Green;
tableStyle.Columns[2].HeaderFont = Color.Blue;

I'm using C#. I'm aware of 3rd Party tools that can do this, but want to avoid them if possible.

Any help would be very much appreciated,

Thanks, Jonny

How to create automatic updates ?

Inquire2you18-Nov-04 4:14

Inquire2you

18-Nov-04 4:14

Hi,
Is anyone know how to write automatic updates like windows automatic updates ?

Thank

Re: How to create automatic updates ?

Ami Bar18-Nov-04 9:19

Ami Bar

18-Nov-04 9:19

Look for the Updater ApplicationBlock at

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html/updater.asp

Ami

combobox.selectedvalue

webhay18-Nov-04 3:16

webhay

18-Nov-04 3:16

Hi all,

i made a two combobox i fill the first one from database and i take the selected value from the first combobox to select another recorde from table but it got me an exception
"The column prefix 'System.Data' does not match with a table name or alias name used in the quer"

and this my code:

<br />
SqlDB DB = new SqlDB();<br />
DB.ConStr = DB.ConnectionSTR(DB.Current_DB());<br />
DataSet ds = DB.Select("Select * From MSA Where Client_ID = "+cboClient_Name.SelectedValue.ToString()+"");<br />
cboMSA_ID.DataSource = ds;<br />
cboMSA_ID.DisplayMember = "Table.MSA_Effective_Date";<br />
cboMSA_ID.ValueMember   = "Table.MSA_ID";<br />

SqlDB contain the database handling (command , connection...)

please help
Frown | :(

String Contains String

MrEyes18-Nov-04 3:01

MrEyes

18-Nov-04 3:01

Does anybody know of any way to perform a string contains string check without using regex.

For example

string s1 = "abcdefg";
string s2 = "def";
string s3 = "xyz";

bool b1 = StringContains(s1, s2);
//b1 is true
bool b2 = StringContains(s1, s3);
//b2 is false

bool StringContains(string baseString, string searchString)
{
?????
}

post.mode = postmodes.signature;
SELECT everything FROM everywhere WHERE something = something_else;
> 1 Row Returned
> 42

Re: String Contains String

MrEyes18-Nov-04 3:10

MrEyes

18-Nov-04 3:10

Forget it, I just found the IndexOf() function

post.mode = postmodes.signature;
SELECT everything FROM everywhere WHERE something = something_else;
> 1 Row Returned
> 42

easy: string formatting

bouli18-Nov-04 1:17

bouli

18-Nov-04 1:17

Hi gurus,

I have a simple question about formatting strings.

I would like to know how I can convert an hex value to the character itself?

we give the string "3a" and the formatting says ";".

how to do that in C#? the %x format is unknown to C# Wink | ;)

thanks.

best regards.

There is no spoon.

Re: easy: string formatting

Ami Bar18-Nov-04 4:11

Ami Bar

18-Nov-04 4:11

Use int.ToString()

If you have : int a = 0x3a;

The result of a.ToString("X") is "3A"

Ami

Re: easy: string formatting

bouli18-Nov-04 4:15

bouli

18-Nov-04 4:15

thanks for the trick.

I use the Convert class Smile | :)

Convert.ToString(Convert.ToChar(int.Parse(txtCharacter.Text, System.Globalization.NumberStyles.HexNumber)));

It's heavy but it does what I want. If things can be simpler, let me know.

There is no spoon.

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