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I want to get the image null of that picturebox but cant get it using contextmenu.SourceControl.Image=null;
doesn't work any idea???????
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Hi,
void contextMenu_Popup(object sender, EventArgs e) {
ContextMenu cm=(ContextMenu)sender;
Control cs=cm.SourceControl;
log("contextmenu sender="+cm);
log("contextmenu SourceControl="+cs);
...
SourceControl returns the CONTROL that is showing the ContextMenu;
you cannot get to its Image property, because a general Control doesnt have one.
You must cast it to a PictureBox if you want to perform PictureBox specific
operations.
PictureBox pb=cs as PictureBox;
if (pb!=null) pb.Image=null;
this would remove the image.
In future, dont post "cant" and "does not work" but provide specific information
such as "Compiler gives the following error: ..." or "Running the app gives
following Exception: ..."
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I have setup a program with my DataSets in arrays
public static DataSet_PMI20[][][] dsPMI20 = new DataSet_PMI20[8][][];
with a table in the dataset would be
dsPMI20[8][5][20].PMIVar20
How do I setup a stored procedure to fill this dataset, do I need 40(8x5) different tables in SQL Server to feed this dataset. Have the SP loop through all of these tables to fill it. I am using Strongly Typed DataSets.
Some of the programs on this site write stored Procedures automatically, will any of these be of use, or any articles that you know of help. Is there a better way for me to do this.
Any ideas, I would appreciate any suggestions or help on setting this up.
Thanks in advance.
Michael
-- modified at 20:58 Thursday 21st June, 2007
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Three Dimentional array of dataset. sounds like you have made it real complicated. Any special reason of doing it like this? Because if not there are easier solutions
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I use the same methods, formulas, etc. to calculate data at different dimensions, therefore it was easier to set things up in a loop and just change the variable in the array. What are the alternative ways you are speaking of. I might be able to change my code to fit it possibly.
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May be its just me but I have never used two\three dimentional dataset array as data access. In the data layer when you add dataset, you get all the tables through Stored procedure and combine them with relations in a dataset. You will have different Datasets according to your need and the relations in the Database.
This might not be what you are looking for. I am not sure what your requirement is. May be the way you are doing is the best for what has to be done.
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I think what I will try is to use the data adaptors generated and place a for statement somewhere that changes the table name and loads the data from multiple tables. If that doesn't work I will try as I suggested earlier and have the SP loop through the tables. Maybe even setup differen data adaptors to do the job if necessary. Thanks for the thought.
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Hello,
I just found out that, my editor made of rtb lags really bad when the number of lines is longer than 100 for example.
Could it be because im using the syntax highlighting textbox library to highlight syntax inside the editor?
Is it possible to increase the performance of it somehow so it doesnt lag ever sec as you type.
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I am not surprised since a textbox is holding all its data in one string;
doing anything fancy to it does not scale well, it is at least quadratic:
when the text grows, so does the number of operations required, AND the cost
of each operation (creating a new string copying all the characters).
I see no easy way out; I did my own line-oriented text editor (with syntax
highlighting and everyting) in a plain Panel; and I do all screen-based logging
to a ListBox.
I am not a big fan of either TextBoxes or RichTextBoxes because
of their degrading performance. I only use them for short texts (say 50 lines),
and preferably texts that dont change.
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How can i create a line-oriented text editor of my own with syntax highlighting ability?
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If you are not happy with what you have, I can tell
you how I did it, but I must warn you, it has been
a big effort.
I did it as part of a larger project; relevant steps include:
- text lines stored in memory basically in an ArrayList,
one item per line;
- each line also holds two flags to indicate comment
status; these get set when the line is input/changed;
- text drawn in a Panel, using OnPaint handler,
and Graphics.DrawString;
- all coloring/syntax highlighting handled inside OnPaint,
based on a simple parser that knows the list of
keywords (and their color) for each of the supported
programming languages.
Steps taken to get maximum performance:
- only the visible lines are parsed, colored and painted;
lines scrolled outside the panel are skipped (except
for the comment flags).
A typical Panel shows up to 60 lines, a very small
number with respect to an entire source file.
- the comment flags help in starting the first visible
line either as continued comment (green background)
or not.
- the simple parsers are not full fledged parsers, they
dont understand expressions, dont return a parse tree,
etc. They must only process a single line and know about
comments, string literals, and keywords.
- the parsers return tokens (identifiers, constants,
operators, etc) as a string plus Color; Graphics.DrawString
paints these tokens individually.
- as a result of all this, nearly linear behavior, and no delay
whatsoever.
All in all a couple thousand lines of C# code (and
based on a growing library of low-level classes that
I use in all my apps and that is not included in the
estimate).
Hope this clarifies things.
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Okay, somebody tell me the secret!!!
I need to check the ASCII value of a
single character in a string --
(value of a quote " or an equal sign =,
which is ascii 34 and 61 respectively)
I cannot figure out how this is done -- I've
been all over the map on this! I'm embarrassed
to say I am an experienced programmer (PLSQL and
VB6) C# is my first object oriented effort and
I am about to pull my hair out on what would seem
to be a simple task. Please, if anyone can show
an example of this, I'd truely be grateful.
Remember that I am a beginner and may not be
able to make leaps of logic as in "just use Char".
Thanks.
stone_sks
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stone_sks wrote: "just use Char".
See? You know the answer already. 
In what way do you want to "check the ASCII value"?
Will something as simple as if ( s [ 0 ] == 61 ) ... suffice?
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Yes, it could be that simple.
What I am doing is parsing through a string
where I need to check each character's ASCII
value. But yes, it could be as simple as
your example inside a for loop. Thank you.
stone_sks
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And Regular Expressions won't do what you need?
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No, I need to check the value against the ASCII
chart, as in the following example (which is VB6 code)
c is value I will check.
Select Case Asc(c)
Case 13, 9, 10
sSql1 = sSql1 & " "
Case Is < 32
sSql1 = sSql1 & " "
Case 34
sSql1 = sSql1 & "'"
Case Is > 124
sSql1 = sSql1 & " "
Case Else
sSql1 = sSql1 & c
stone_sks
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Well, as Luc pointed out, you can use character literals
switch ( c )
{
case '\t' :
case '\r' :
case '\n' : ... ; break ;
case '\"' : ... ; break ;
...
default : ... ; break ;
}
Although, that test for < 32, is problematic.
But it looks like you're simply replacing non-printing characters with a SPACE, a QUOTE with an APOSTROPHE, and everything else left as it is; I expect that can be done with a Regular Expression.
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PIEBALDconsult wrote: Although, that test for < 32, is problematic
well, not really, I would suggest:
if (c < ' ') ...
There is one, very structured, alternative using an array, that serves as
a translator; it does not rely on any knowledge about ASCII values !
char[] translatation=new translation[128];
translatation[(int)'a']='a';
translatation[(int)'b']='b';
translatation[(int)'\t']=' ';
etc
then:
foreach (char cin in inputCollection) {
char cout=0;
if (cin<translation.Length) cout=translation[(int)cin];
if (cout!=0) stringbuilder.Append(cout);
}
of course the initialization can be shortened by using a foreach loop as in
foreach (char c in "abcd....") translation[(int)c]=c;
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Well I meant it doesn't fit with the switch.
This is a case where a series of if/elses is better than a switch
if ( ( c < ' ' ) || ( c > '~' ) ) // append ' '
else if ( c == '\"' ) // append '\''
else // append c
The original VB (?) is more complex than necessary.
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Thanks for your help Luc!
stone_sks
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You're welcome.
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Thank you for you help . I'll experiment with
all the suggestions.
stone_sks
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Yes, it could be that simple.
What I am doing is parsing through a SQL string
of text where I need to check each character's ASCII
value. The string I am checking will be form of an
SQL statement. My end goal of the program I am
developing is to convert the statment to Vb style
SQL.
But yes, it could be as simple as
your example inside a for loop. Thank you.
stone_sks
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You seldom need the integer ASCII value of a character in a C# app !
You can use character constants such as '=' and even '\"'
If you really want to know their integer value try
char c='=';
int ASCIIvalue=(int)c;
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Hello everyone,
Here is a scenario:
Front End:
MSVS2005 - C# - DGV
Back End:
MS SQL Server2005 - Stored Procedures
On the backend the main table contains a column named "OfficeID", tinyint, and in another table named "Offices" there are three coulmns "OfficeID", tinyint (PK); "OfficeName", nchar; and "OfficeAbb", nchar.
In my SELECT stored procedure I do an INNER JOIN of "OfficeID" columns in these two tables and display the OfficeAbb string on my front end DataGridView when I call the SELECT stored procedure instead of that tinyint stored in the main table.
This works great and DGV displays the Office Abbreviation based on the tinyint stored in the OfficeID column of the main table.
However, when I try to call my UPDATE stored procedure to update the main table I get "Failed to convert parameter value from a String to a Byte" because the DataSet now holds that two letter string office abbreviation and apparently the DataAdapter is not smart enough to lookup the Offices table and replace the string with the OfficeID tinyint for me.
I guess I either have to use some method of the DataAdapter to instruct it to translate the string into the tinyint based on the Office table values or to change the UPDATE stored procedure to where it would accept the string and than do the value translation for me. I suspect both options are possible but was unable to Google this out despite this being such a common scenario.
Any help is appreciated.
Thanks for reading,
Dean
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