C# Discussion Boards - CodeProject

Adding datagridview columns

5-Jun-09 21:55

You will find all the help you need here[^].

Christian Graus

Driven to the arms of OSX by Vista.

Please read this[^] if you don't like the answer I gave to your question.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

michaelgr15-Jun-09 20:27

5-Jun-09 20:27

Hello,
I need to add datagridviewcolumns in a loop. For example:

string[] default_columns { "VlFile", "EquipName", "JobName", "NickName", "Operator", "EquipmentStartTime", "JobComment", "EquipTypeDesc" };
foreach (string s in default_columns)
{
  //Here i need to add the a column with the name in S                   
}

The columns need to be bounded. I have the bound source and all this but the problem is adding the columns.
It will loop me through the array (default_columns) and will add this columns.

How can i do it?
I mean there is a problem because i need to declare a variable

MickCurley5-Jun-09 21:28

MickCurley

5-Jun-09 21:28

I would create a datatable and point the datagridview to it

DataTable DT = new DataTable();

foreach (string s in default_columns)
{
    DataColumn NewCol = new DataColumn(s);
    DT.Columns.Add(NewCol);                
}

DataGridView.DataSource = DT;

Regards
Mick Curley

Smile | :)

michaelgr15-Jun-09 21:31

5-Jun-09 21:31

OK but i load data to the datagridview from a database. And i need the columns to be bound to the database.
I declared the database (datatable) as a bindingsource to the datagridview.
But i need to add columns in the program (the user will choose which columns he wants to see)

MickCurley5-Jun-09 21:39

MickCurley

5-Jun-09 21:39

I dont understand what your trying to do.
If you load the data from your Database table into a DataTable
haven't you got a reference to the columns within that DataTable?

Regards
Mick Curley

Smile | :)

michaelgr15-Jun-09 21:45

5-Jun-09 21:45

I have an empty datagridview (without columns declared- in the wizard of the datagridview).
The user choses which columns he wants to see from the database (using a listbox that i save the items in an array).
I want to add columns to the datagridview from this array (that was created from the listbox). The problem is that i need them to be bound to that datatable.
So i do in the foreach loop

datagridview.Columns.Add(s, s);

it creates me the columns right but they are not filled with data from the database.

If i do:
datagridviewcolumn col=new datagridviewtextboxcolumn();
col.headertext="abc";
col.datapropertyname="abc";
col.name="abc";

It does creates me the column and filles it with data.
But i need to do it in a loop that will go through all the items in the array (from the listbox) and add this columns
But i can use the same name to the datagridviewcolumn (datagridviewcolumn col=new datagridviewtextboxcolumn();), Because if i do it it says i already have this column (even if i change it's name in the loop)

michaelgr15-Jun-09 21:49

5-Jun-09 21:49

I think i managed the problem. I had to declare the datagridviewcolumn
(datagridviewcolumn col=new datagridviewtextboxcolumn();)
inside the foreach loop (i declared it outside) and in this way it declares a ned datagridviewcolumn for each item in the loop.

making a scanner .. it skips alphanumerics.. where am i going wrong??

MickCurley5-Jun-09 21:54

MickCurley

5-Jun-09 21:54

Good to hear..

Regards
Mick Curley

Smile | :)

canatan5-Jun-09 18:14

canatan

5-Jun-09 18:14

okay i read the input from the text box as a char array.. then i've put if conditions that check for whitespaces, comments, strings, digits,
but it always skips which means that the comments then lie in the strings bit and so on...
please tell me where i went wrong here .
thankyou

#region Scanner
           for (int i = 0; i < readInput.Length; i++) // beginning to read char one by one
           {
               char x = readInput[i];
               #region Whitespace
               if (char.IsWhiteSpace(x)) //checking for whitespaces
               {
                   continue;
               }
               #endregion
               #region stringliteral
               else if (x == '"') //checking for " and proper"
               {
                   i++;
                   //x = readInput[i];
                   StringBuilder adder = new StringBuilder();
                   do
                   {x = readInput[i];
                       MessageBox.Show(x.ToString() + "testing");
                       adder.Append(x);                                //continuing till next " is found
                       i++;
                       if (i == readInput.Length)
                       {
                           MessageBox.Show("WRONG");
                           break;
                       }


                   } while (x != '"' && i < readInput.Length);
                   whole.Add(adder);

               }
               #endregion
               #region syntax
               else if (char.IsLetter(x) || x == '_' && x!='"') // checking for syntax
               {
                   StringBuilder adder = new StringBuilder();
                   do
                   {
                       x = readInput[i];
                       MessageBox.Show(x.ToString() + "Letter Only");
                       adder.Append(x);
                       i++;
                       if (i == readInput.Length)
                       {
                           break;
                       }


                   } while ((char.IsLetter(x) || x == '_' && x!='"') && i < readInput.Length);
                   whole.Add(adder);
               }
               #endregion
               #region digitliteral
               else if (char.IsDigit(x)) // checking for digits
               {
                   StringBuilder adder = new StringBuilder();
                   do
                   {x = readInput[i];
                       MessageBox.Show(x.ToString() + "Is Digit");
                       adder.Append(x);
                       i++;
                       if (i == readInput.Length)
                       {
                           break;
                       }


                   }
                   while (char.IsDigit(x) && i < readInput.Length);
                   whole.Add(adder);
               }
               #endregion
               #region comments
               else if (x == '$') //checking for comments
               {
                   i++;
                   x = readInput[i];
                   do
                   {
                       MessageBox.Show(x.ToString() + "testing comments"); //continuing till next " is found
                       i++;
                       if (i == readInput.Length)
                       {
                           MessageBox.Show("WRONG");
                           break;
                       }
                       x = readInput[i];

                   } while (x != '\n' && i < readInput.Length);

               }
               #endregion



           }
           #endregion

Re: making a scanner .. it skips alphanumerics.. where am i going wrong??

Christian Graus5-Jun-09 18:37

Re: making a scanner .. it skips alphanumerics.. where am i going wrong??

5-Jun-09 18:37

canatan wrote:
else if (char.IsLetter(x) || x == '_' && x!='"')

I'm not sure this is correct. I mean, if x = ", then it can't equal _ or a letter, right ? I suspect you at least want to add some brackets. Then I'd step through it to work out what's going wrong.

canatan5-Jun-09 20:33

canatan

5-Jun-09 20:33

its
else if((char.IsLetter(x)||x=='_')&&(x!='"'))
okay so i think i fixed the digit bit but it causes problems elsewhere
<pre> #region digitliteral
else if (char.IsDigit(x)) // checking for digits
{
StringBuilder adder = new StringBuilder();
while (char.IsDigit(x) && i < readInput.Length)
{
MessageBox.Show(x.ToString() + "Is Digit");
adder.Append(x);
i++;
if (i == readInput.Length)
{
break;
}
x = readInput[i];

}

whole.Add(adder);
i--;
MessageBox.Show(adder.ToString()+readInput[i]);
}
#endregion
now all the digits come out right .. but the " is still ignored for some strange reason.. and i cant figure out the problem in that.. instead of the " being picked up.. it picks up the letter after the " and uses that instead...
i-- sets i to the last digit and then the loop shud run again which would mean that i should iterate to the next which is a " and hence this should be detected ..

Re: making a scanner .. it skips alphanumerics.. where am i going wrong??

Christian Graus5-Jun-09 20:48

Re: making a scanner .. it skips alphanumerics.. where am i going wrong??

5-Jun-09 20:48

Have you set a breakpoint and stepped through the code to see where things go wrong ?

canatan6-Jun-09 3:24

canatan

6-Jun-09 3:24

thanks

i got it

wrote it all out and worked it out Big Grin | :-D

how to make Binary File in c#

hamziak5-Jun-09 17:09

hamziak

5-Jun-09 17:09

hi all
i am having a problim to save data in a binary file
binary file i mean if i edit it in notepad i will get

‏P—|S->\|’>(%x4ˆ}ֹµ%!רצIO׃ֱ1»ֹ4x(™”ףy_A×Gֳז˜‘ LO׀S Bb<<Skק¥"D$¥פƒג8H”ׂlt;ל3’”|w„‎´IK”ה~*2uOהRR‎yJ}ׂN¾z$×d8Mּ₪˜#ֱ%2JS&4ך’©‘ו#פ|׃J~tIJ$Bnב)’™נ„”¿ק¥ֲa:₪{‘ק$¥ּ%א`GtrJTר¥:„¾t’R‎¾=“י Mּ₪JH\B~׃DAR׳lq )sֿqפP5NֹגRRַ@~$צ‎=<RRַ’˜iֺGRS™I+¦׀'&

i need a function in c# to save the string "http://www.quickapp.co.il/" in binary way
thankX
hamzi

Re: how to make Binary File in c#

Christian Graus5-Jun-09 17:10

Flash movies without creating temporary files

5-Jun-09 17:10

I think you are very confused. Your string IS being saved in a binary way. I assume you mean that you want to encrypt the string. Use the Cryptography namespace for this.

SSDream5-Jun-09 17:00

SSDream

5-Jun-09 17:00

Hello!
I’m trying to build an app, which should have Flash Video Play control, which plays FLV from server (certain URL). For Flash Player ActiveX you have to save the movie to a temporary location to load it and play, isn’t it? You'll have to create a corresponding link that you can pass to the Flash Player ActiveX and then delete the movie after it is played. Of course you can’t guarantee high security level , but I think it’s good, if at least no temporary files are created. So the question is how to make Flash Player ActiveX be able to load flash movies directly from any source without usage of temp files?

Thank you!

Re: Flash movies without creating temporary files

Christian Graus5-Jun-09 17:09

Re: Flash movies without creating temporary files

5-Jun-09 17:09

If the ActiveX control doesn't have a method that takes a URL for the file to play, or if you're using that method, and it creates a local file, then I suspect you have your answer.

Just to add - if your Flash player plays a file from the server, then your machine must have access to that file on the server. So, how does it matter if a copy is made locally, or not ?

SSDream6-Jun-09 18:26

SSDream

6-Jun-09 18:26

"Just to add - if your Flash player plays a file from the server, then your machine must have access to that file on the server. So, how does it matter if a copy is made locally, or not ?"

I'm trying to prevent local access to Flash player file by other applications. I think it's also good if Flash player able to play movie during loading, It's would not wait while loading is complete.

Use ActiveX without registration

SSDream5-Jun-09 16:55

SSDream

5-Jun-09 16:55

Hi!
My app uses one ActiveX and I don't want to register it under WinXP. Is it possible to use ActiveX without registration?
Thanks!

Re: Use ActiveX without registration

Christian Graus5-Jun-09 16:58