Re: Data Grid View Column Headers - C# Discussion Boards

23-Aug-07 7:47

Hello,

I have a data grid view, and what I am trying to do is, grab all the column headers and put them into a combo box or list box.

what I have so far is:

foreach (DataColumn column in this.dataGridView1.Columns)
{
this.listBox1.Items.Add(column.ToString());
}

I get an error with this, it is:
"Unable to cast object of type 'System.Windows.Forms.DataGridViewTextBoxColumn' to type 'System.Data.DataColumn'"

Any help would be apreciated.

Thanks

J

FernandoMartin23-Aug-07 8:45

FernandoMartin

23-Aug-07 8:45

you can try:
foreach (DataColumn column in this.dataGridView1.Columns)
{
this.listBox1.Items.Add(column.HeaderText);
}

jasper01823-Aug-07 9:03

23-Aug-07 9:03

Thank you for your help!

jasper01823-Aug-07 9:06

23-Aug-07 9:06

Thanks... The end result that I ended up with is:

foreach (DataGridViewColumn column in this.dataGridView1.Columns)
{
this.listBox1.Items.Add(column.HeaderText);
}

Sebastien Lachance23-Aug-07 8:49

Sebastien Lachance

23-Aug-07 8:49

this.dataGridView1.Columns returns a collection of GridViewColumn, not DataColumn. In this case, the column returned is a specialized version of GridViewColumn which contains a textbox.

<br />
 foreach (GridViewColumn in this.dataGridView1.Columns)<br />
{<br />
this.listBox1.Items.Add(column.HeaderText);<br />
}<br />

My Blog[^]

jasper01823-Aug-07 9:04

23-Aug-07 9:04

Thank you for your help, I added a identifyer, and it worked great! Thanks.

Here is the end result.

foreach (DataGridViewColumn column in this.dataGridView1.Columns)
{
this.listBox1.Items.Add(column.HeaderText);
}

Problem with String.Replace()

Sebastien Lachance23-Aug-07 10:44

Sebastien Lachance

23-Aug-07 10:44

You're welcome Big Grin | :-D

My Blog[^]

inheritance

kalyan_241623-Aug-07 6:53

kalyan_2416

23-Aug-07 6:53

hi all
abstract class c
{
abstract function()
}
class c1:c
{
override fucntion()
{
//
}
void function()
{
}
}
class c2:c1
{
c1 obj=new c1()
obj.//how do i differenciate that i wanna call overrided function and ordinanry function of c1

Re: inheritance

Judah Gabriel Himango23-Aug-07 7:01

Judah Gabriel Himango

23-Aug-07 7:01

c.function will always call the overrided method. You cannot call the base one. If that's what you want, don't use overrides, using hiding:

class Base
{
    public void Foo() { ... }
}

class Derived : Base
{
   public new void Foo() { ... }
}

// Call the base one
Base obj = new Base();
obj.Foo();

// Call the derived one
Derived derived = new Derived();
derived.Foo();

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Roman Catholic Relevance?
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Gump61923-Aug-07 6:30

23-Aug-07 6:30

Hello,

I'm having a problem that I thought would be very easy to fix. It could just be something small I am missing. I am loading a string that contains an XPath query. Inside the string I have a couple variables being loaded from an XML request. My line: XmlNodeList regionList = root.SelectNodes(xpathRegion); is throwing an exception when the variable includes an ' like Amp'd for example. I can check for characters easy enough and remove that character, but I actually need to leave it as the query needs to search based on the exact name.

I am trying the following:

string oldText = catName;
string newText = oldText.Replace("'", "\\'");

I figured this would escape the first slash, and replace the ' with \' but it actually shows up as \\'
if I change the line to string newText = oldText.Replace("'", "\'"); only the ' shows up in the string.
I can't seem to get newText to contain Amp\'d so that when used in the XPath it finally ends up the way it was.

Is there a different method I should use, or am I making some type of beginner error? Thanks,

Forrest

Judah Gabriel Himango23-Aug-07 6:55

Judah Gabriel Himango

23-Aug-07 6:55

Does this article on replacing special XML characters[^] help?

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Roman Catholic Relevance?
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Gump61923-Aug-07 7:14

23-Aug-07 7:14

Thanks for the link. This is certainly a great resource to have. It looks like the Xpath string is still blowing up even with a \'

Judah Gabriel Himango23-Aug-07 8:00

Judah Gabriel Himango

23-Aug-07 8:00

instead of \', have you tried ' instead?

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Roman Catholic Relevance?
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Gump61923-Aug-07 8:08

23-Aug-07 8:08

Yes, and " Those values are inserted into the string, but I guess it is not read as an xpath query since I still get an invalid token message.

Chase Davis23-Aug-07 7:08

Chase Davis

23-Aug-07 7:08

Try this and see if it works:

string oldText = catName;
string newText = oldText.Replace("'", @"\'");

Chase Davis

Gump61923-Aug-07 7:16

registry - create printer - redirect port

23-Aug-07 7:16

Thanks Chase. This is exactly what I needed to do to get the string to contain \' BUT it looks like the xpath string is still blowing up when SelectNodes() is called. I don't think it recognizes the escape sequence. I also tried including ' but it didn't recognize that either. I do appreciate the help though.

HarryFlodder23-Aug-07 4:58

HarryFlodder

23-Aug-07 4:58

Hi folks,

I have a deployment project which set's up registery entries for using redmonnt.dll and any other things which are neccessary.

First I create a printer setup over the redirect port manually and extract all entries from the registry. (I hope they are all Cry | :((

)

This procedure produces a printer icon within the printer explorer and provides a new available printer in the print dialog of applications.

If I run my installer all reg entries were made (device, port, ...), but no printer icon is available and my printer is inaccessible to the applications print dialog.

Do you have me some hints, what additional work do I need to do.

Thanks. Smile | :)

RichTextBox Formatting Help

solutionsville23-Aug-07 3:46

solutionsville

23-Aug-07 3:46

Ok, I know it is long...

In an OpenFile() routine I am trying to change the color on the text of a file at a specific position, and do this prior to it loading into a RichTextBox.Text property. I can do this with the findSequenceNumbers() routine below;

If I do it after it loads by using the findSequenceNumbers() routine it takes about 3 - 4 minutes dpending on the file size as it scrolls thru the text box.

I want to perform this formatting using the RichTextBox.RTF property however I do not understand it, nor do I understand where I would fit it in. I did create the file and save it after I formatted it as an RTF document and when I open it in a text editor this is what is at the top;

{\rtf1\ansi\deff0{\fonttbl{\f0\fnil\fcharset0 Courier New;}}
{\colortbl ;\red0\green0\blue139;}
\viewkind4\uc1\pard\lang1033\f0\fs20

A formatted line with the color change looks like this;

2007/08/13 14:00:03 [144007]ARES_EINDICATION 010.050.016.010 420.1.01 (6901) RX 68 bytes 69 01 26 02 28 A4 AA 20 76 96 51 44 50 76 08 45 46 00 34 02 02 C7 88 \cf1\b 01\cf0\b0 C7 88 AA 50 76 08 45 46 20 76 96 51 44 D7 07 08 0D 0D 3B 3B 00 00 10 06 0A 06 06 06 06 06 06 0A 0A 06 06 06 06 0A 0A 9B 67 5F 91 F8 \par

-------------------------------------------
private void OpenFile()
{
try
{
if (OpenFileDialog.ShowDialog() == DialogResult.OK)
{
string strExt;
strExt = System.IO.Path.GetExtension(OpenFileDialog.FileName);
strExt = strExt.ToLower();

if (OpenFileDialog.FileName == "")
{
return;
}
switch (strExt)
{
default:
if (strExt == ".rtf")
{
rtbDoc.LoadFile(OpenFileDialog.FileName, RichTextBoxStreamType.RichText);
}
else
{
StreamReader rtfReader;
rtfReader = new StreamReader(OpenFileDialog.FileName);
rtbDoc.Text = rtfReader.ReadToEnd();
rtfReader.Close();
rtfReader = null;
rtbDoc.SelectionStart = 0;
rtbDoc.SelectionLength = 0;
}
break;

case ".dat":
rtbDoc.Text = Streamer.LayoutInput(OpenFileDialog.FileName);
break;
}
currentFile = OpenFileDialog.FileName;
rtbDoc.Modified = false;
this.Text = "Train Control Editor: " + currentFile.ToString();
}
else
{
MessageBox.Show("Open File request cancelled by user.", "Cancelled");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString(), "Error");
}
}

-------------------------------------------
private void findSequenceNumbers()
{
toolStripStatusLabel.Visible = toolStripProgressBar.Visible = true;
toolStripProgressBar.Value = 0;
int lineNum = 0;
bool startingNewLine = true;
FontStyle style = FontStyle.Bold;
string[] lines = rtbDoc.Lines;
string text = rtbDoc.Text;
toolStripProgressBar.Maximum = text.Length;
for (int i = 0; i < text.Length; i++)
{
if (startingNewLine)
{
if ((lines[lineNum].Contains("ARES_EINDICATION")) || (lines[lineNum].Contains("ARES_INDICATION")))
{
i += 169;

rtbDoc.Select(i, 2);
rtbDoc.SelectionFont = new Font(rtbDoc.SelectionFont, rtbDoc.SelectionFont.Style ^ style);
rtbDoc.SelectionColor = Color.DarkBlue;
}
else if (lines[lineNum].Contains("]CODELINE_INDICATION_MSG"))
{
i += 160;
rtbDoc.Select(i, 2);
rtbDoc.SelectionFont = new Font(rtbDoc.SelectionFont, rtbDoc.SelectionFont.Style ^ style);
rtbDoc.SelectionColor = Color.DarkBlue;
}
else
{
i += lines[lineNum].Length - 1;
}
startingNewLine = false;
Application.DoEvents();
}
if (text[i] == '\n')
{
startingNewLine = true;
lineNum++;
}
toolStripProgressBar.Value = i;
}
toolStripStatusLabel.Visible = toolStripProgressBar.Visible = false;
rtbDoc.Select(0, 0);
rtbDoc.ScrollToCaret();
}
--------------------------------------------------

Thanks,

Brian

mav.northwind23-Aug-07 4:04

mav.northwind

23-Aug-07 4:04

Hi!
Although I cannot really follow what you're trying to do, it seems as if a different way would be much easier:
Create a (invisible) RichTextBox, load the RTF document into this box, find the lines you want to colorize using the Text property of the RTB, select them and then assign the SelectionColor you want.

Afterwards you can simply assign the invisible RTB's Rtf property to the target RTB and you're done.

If you really want to modify the RichText yourself, I suggest reading the Rich Text Format (RTF) Specification, version 1.6[^], but a quick scan through the introduction will show you that it's not as easy as you might think.

Regards,
mav

--
Black holes are the places where God divided by 0...

solutionsville23-Aug-07 4:32

solutionsville

23-Aug-07 4:32

I have tried having the RichTextBox is both visible and invisible. No difference in the time it takes for the SelectionColor. It takes 3 -4 minutes regardless.

My goal is to speed up the process for this.

If I select all text and change it to BOLD it takes a second or two, if I change the color of all the text it takes the same time.

Your right the RTF spec is not easy.

Brian

Big Daddy Farang23-Aug-07 7:35

Big Daddy Farang

23-Aug-07 7:35

I don't have a quick and easy answer for you, but you probably weren't expecting one. I can offer a little help though, I hope. I have used RichTextBox controls a little bit, but what I was doing was writing a simple "report, " saving it to a file, sending it to a client application that then displayed the file in a RichTextBox control.

Anyway, you said you wanted to use the .Rtf property. I didn't use it, but as I understand it, you'd need to load your rtf-formatted text into a string object, then

<br />
string rtfString = /* some magic loading */ ;<br />
rtbDoc.Rtf = rtfString ;<br />

What I did was:

<br />
richTextBox.LoadFile ( path ) ;<br />

I don't think that the .Rtf property is going to be much help, though. Here are my assumptions about things you've done so far:

You have data in a text-based file captured from a device or other source.
You opened a data file in Wordpad and found the text of interest.
You changed the interesting text to bold and blue.
You saved the result as .rtf file.
A portion of that file is shown in your post.

<br />
\cf1\b 01\cf0\b0<br />

This portion of that text means color foreground #1 from color table, bold, 01 (which is the interesting text), color foreground #0 (back to default color), bold off. The color table is defined on line 2:

<br />
{\colortbl ;\red0\green0\blue139;}<br />

I don't think that the 3 - 4 minute delay really has anything to do with rtf issues. I think that's time taken for findSequenceNumbers to parse the strings. I'd try putting some debug statements before and after a call to it. Find out how much time it is taking.

If my first assumption above is correct, my approach would be to process the data file a line at a time, looking for the tokens as seen in findSequenceNumbers and embedding the rtf instructions

<br />
\cf1\b <br />

and the like in the lines. Of course you'd also have to put the other rtf stuff in your StringBuilder or whatever. Not sure if that's really going to speed things up or not, it's just another way to skin the cat.

Hope this helps a little.

BDF