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WebRequest wrGETURL;
wrGETURL = WebRequest.Create(sURL);
((HttpWebRequest)wrGETURL).UserAgent = "Mozilla/5.0";
Q1) On the first line above we can see that WebRequest is a class. On line 2 it seems to me that WebRequest is now an "instance". Could somebody explain that to me? I don't understand how you can call a method on a "class". I thought you had to call it on an "instance of the class".
Q2) In the third line wrGETURL is being cast to HttpWebRequest. I really don't understand how this could be legal since HttpWebRequest is derived from WebRequest. Could somebody demonstrate this casting using a generic set of classes (foo, bar ... etc.)
Thanks!
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A1) In the second line, WebRequest is still a class, and Create() is a static[^] method of that class.
A2) Well, WebRequest.Create() can return various types of web requests (including HTTPWebRequest), therefore, it needs to have the generic web request as a return type. In this case, I suppose that the URL is assumed to start with "http://" and therefore return an HTTP request.
"Blessed are the peacemakers, for they shall be called sons of God." - Jesus
"You must be the change you wish to see in the world." - Mahatma Gandhi
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i have some problems storing data in an access-database.
my dataadapter don't want to execute the update()-command
correctly.
i'm creating my commands via OleDbCommandBuilder and the
sql-statements seems correct. only the select-command works
properly. the only difference between the select-command object
and the others is a private attribute called "executequery".
in the select-command that flag is true in the others false.
but i cannot access it!
what is to do?
here's some code:
string sConnString = "provider=Microsoft.JET.OLEDB.4.0; data source = myDatabase.mdb";
string sCmdString = "SELECT * FROM dbTest";
OleDbDataAdapter dataAdapter = new OleDbDataAdapter(sCmdString, sConnString);
OleDbCommandBuilder cb = new OleDbCommandBuilder(dataAdapter);
dataAdapter.UpdateCommand = cb.GetUpdateCommand();
dataAdapter.UpdateCommand.CommandTimeout = 20;
dataAdapter.InsertCommand = cb.GetInsertCommand();
dataAdapter.InsertCommand.CommandTimeout = 20;
dataAdapter.DeleteCommand = cb.GetDeleteCommand();
dataAdapter.DeleteCommand.CommandTimeout = 20;
// that works
table = new DataTable(sTable);
dataAdapter.Fill(table);
// fill the table with some data
// ...
// that one doesn't work
dataAdapter.Update(table);
thanks,
phil
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I'm not sure if this is the problem that you are having, but have you set up your UpdateCommand property of OleDbDataAdapter or DataSet instance that you are working with? I think you have to do that in order for Update to work properly.
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Hi. I need to read a text file.
I know that the System.Xml.XmlTextReader class provides a way for ignoring white spaces (space, tab, return, ...) using the WhitespaceHandling field.
I was wondering if there is something like that for reading plain text files (since i did not find it)
ricardo
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Try the System.IO namespace - espically System.IO.TextReader.
α.γεεκ Fortune passes everywhere.
Duke Leto Atreides
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I did look in TextReader, but since i could not find that feature, that is why i am asking about it here.
ricardo
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a very basic case of opening a text file and checking it's contents :
private void button1_Click(object sender, System.EventArgs e)
{
TextOpen("test.txt");
}
private void TextOpen(string txtPath)
{
System.IO.StreamReader stream = new System.IO.StreamReader(txtPath,Encoding.ASCII,true);
MessageBox.Show(stream.ReadToEnd());
stream.Close();
}
switch(twinsOnWay)
{
case ("twins on the way"):
MessageBox.Show("for mr and mrs dynamic","twins on the way");
break;
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Hehe, it appears people cant read questions anymore 
I assume that you are looking for something like a "word" or "token" reader.
This is rather easy to do, and there are many ways to do this.
1. String.Split( char[] whitespace )
2. Take a string, read it char for char adding it to a StringBuilder when reaching whitespace, add string in StringBuilder to ArrayList and clear StringBuilder, continue the process. This gives you a bit more control and makes debugging easier.
3. Use RegEx.Split
<a TITLE="See my user info" href=http:
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ofcourse lol , i never took notice of the original question correctly. my wife's been in hospital for a few days and she's only 6 and half months gone with expecting the twins , so my mind's elsewhere.
leppie is correct you need to use split if you already have the text in your app and wish to remove "whitespaces".
switch(twinsOnWay)<br />
{<br />
case ("twins on the way"):<br />
MessageBox.Show("for mr and mrs dynamic","twins on the way");<br />
break;
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hello,
i want to do some Internet Explorer programming in .net using c#
but i am not able to have the componet that i should add.
can someone guide me on this.
ASIM
Asim
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Hi all !
Doing double buffer with GDI+ and Windows Form is very easy: just set ControlStyle.DoubleBuffer (AllPaintingInWmPaint, etc.) to true.
Well, my question is do we need to use a background bitmap for drawing and simply do a Graphics.DrawImage() in OnPaint() even if we enable ControlStyle.DoubleBuffer ?
Does this way improve graphics performance ?
Thanks.
--
Julian.
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aeros wrote:
my question is do we need to use a background bitmap for drawing and simply do a Graphics.DrawImage() in OnPaint() even if we enable ControlStyle.DoubleBuffer ?
If you enable the DoubleBuffer style bits then the framework will take care of the background buffer for you, so you just draw on the Graphics object returned by the Paint event, and once you are done drawing (ie all registered handlers for the Paint event have exited) the framework will take what was drawn on the Graphics object and move it to the screen.
James
"I despise the city and much prefer being where a traffic jam means a line-up at McDonald's"
Me when telling a friend why I wouldn't want to live with him
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Unfortunately, the DoubleBuffer style breaks the Transparency style.
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how can i handle the column resize event of a Grid control in C# ??
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Hello all,
I don't want my listview item to be checked when I double-click on it. I tried to catch double-click event, but it does not help me at all. The double-click event always occurs after the item checked event does.
I met another problem with listview. I used e.NewValue=e.CurrentValue in my function OnItemCheck(object sender, System.Windows.Forms.ItemCheckEventArgs e) that handles the item checked event. But e.NewValue=e.CurrentValue code does not work.
Please someone talks to me what wrong with my listview? How can I do in this issue?
Thanks for your help.
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the item click event does occur before the double click ( because you've already clicked it the first time ,before releasing the mouse for the second click ), i think that you would have to determine if the user was clicking on the checkedbox area or over the actual label , then handle it that way. you can obviously do this :listView1.SelectedItems[0].Checked=false; but the user will see the checkbox flicker to checked then back to unchecked.
<font color="blue">Private void</font> ExpectingTwins(<font color="blue">string</font> twins)
{
<font color="blue">switch</font>(twins)
{
<font color="blue">Case</font> ("twins on the way"):
MessageBox.Show("for mr and mrs dynamic","twins on the way");
<font color="blue">break</font>;
}
}
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Hi,
I'm creating a C# windows app, using the RichTextBox control. I need to Hide ID information next to text. According the RTF standard, I can do this using:
{\v Hidden Text}
When I set the RTFtext property of the control to "ABC{\v hidden}DEF", sure enough, it displays "ABCDEF" as required. The problem arises when I read the RTFText property again, which now contains "ABCDEF" - it's thrown the hidden text away!!!
Does anyone know how I can extend the control to include hidden text support?
Any help would be very much appreciated!
Thanks
Mojo
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here's a simple test i did and the richtextbox retained the hidden text without any problems :
VB:
<font color="blue">Private</font> void button1_Click(<font color="blue">Object</font> sender, System.EventArgs e)
{
textBox3.Text=(richTextBox1.SelectedRtf);
}
<font color="blue">Private</font> void button2_Click(<font color="blue">Object</font> sender, System.EventArgs e)
{
<font color="blue">Try</font>
{
richTextBox1.SelectedRtf=textBox3.Text;
}
<font color="blue">Catch</font>
{
System.Exception r=new System.Exception();
MessageBox.Show(r.Message.ToString());
}
}
this was the rtf to start with :
<br />
{\rtf1\ansi\ansicpg1252\deff0\deflang2057{\fonttbl{\f0\fnil\fcharset0 Microsoft Sans Serif;}}<br />
\uc1\pard\f0\fs17 test}
and then i added this :
\v hidden more testing
directly after the normal text.
i then updated the richtext in to the box , replacing the original text.
then later i checked that line of rtf and i got this :
<br />
{\rtf1\ansi\ansicpg1252\deff0\deflang2057{\fonttbl{\f0\fnil\fcharset0 Microsoft Sans Serif;}}<br />
\uc1\pard\f0\fs17 test\v hidden more testing}
so it retained the hidden text fine as you can see at the end of the rtf.
hope this helps
<font color="blue">Private void</font> ExpectingTwins(<font color="blue">string</font> twins)
{
<font color="blue">switch</font>(twins)
{
<font color="blue">Case</font> ("twins on the way"):
MessageBox.Show("for mr and mrs dynamic","twins on the way");
<font color="blue">break</font>;
}
}
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It's the stangest thing! It works with selectedRTF, but not RTF. Thanks, I would have probably never have tried that.
For anyone else doing this - don't forget a space after the "\v".
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I'm working on a program that is a shell for a command-line DOS program. All it does is go through a list of files and for each one it calls a dos program using a System.Diagnostics.Process, waits for it to finish, moves to the next file, etc. Things run smoothly for small numbers of files, but if I use a big list of files, the whole thing locks up for about a minute (task manager says it's "not responding") and then it finally finishes up and gets back to drawing the window and such. I'd see how this could happen if it was just one big call to the dos program, but it's a lot of little calls, with time in-between. What can I do to smooth this out?
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You should maybe spawn a worker thread to do the call outs and stick a Progress dialog up on the screen with a message pump to keep your UI messages processsed properly while it's doing it!
-----------------------------------------------------------------------
Shaun Austin: .NET Specialist. Spreading the word of .NET to the world... well the UK... well my tiny corner of it!!
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Hehe, thanks I was thinking about that. Only thing I don't understand - what's a message pump? I've only written multithreaded apps in C for command-line, so I'm not sure how they work for windowed apps. In fact, I'm not sure how to correctly design windowed apps in general...
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