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I have written .NET remoting project and am looking for a way to know when each and every instance of a SingleCall/Singleton object is created and destroyed.
Does anyone know how to do this? 
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I don't know much about remoting but the idea of a singelton is that there will only be one instance of it during the lifetime of the application. This is usually accomplished by making the varaible a static. Note that there will really only ever be just 1 instance of your Singleton if that is the case.
One approach is to have a static tracker that is incremented in the constructor of your Singleton class and decremented in the destructor.
Ex:
class SingleFella
{
private static int tracker = 0;
private static SingleFella m_instance = null;
public static SingleFella GetInstance()
{
if( m_instance == null )
m_instance = new SingleFella();
return m_instance;
}
public static void DestroyInstance()
{
m_instance = null;
}
private SingleFella()
{
tracker++;
System.Console.WriteLine("Tracker (Constructor)= " + tracker);
}
~SingleFella()
{
tracker--;
m_instance = null;
System.Console.WriteLine("Tracker (Destructor)= " + tracker);
}
public static void Main(String [] args)
{
SingleFella instance1 = SingleFella.GetInstance();
SingleFella instance2 = SingleFella.GetInstance();
SingleFella instance3 = SingleFella.GetInstance();
SingleFella instance4 = SingleFella.GetInstance();
SingleFella.DestroyInstance();
}
}
Give that sample a run and move around the call to DestroyInstance() and you will see the effect.
I'm not quite sure if this is what you are looking for but this is how the Singleton Design Pattern works.
..:: Keno ::..
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Hi,
I need to make a data grid column read only based on the
value chosen in another column.
I have custom table style for the grid, the column styles
are of type DataGridTextBoxcolumn. I made the
DataGridTextBoxColumn for the particular column read-only
at runtime but that does not work.
I would appreciate any help.
Thanks
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DataGridTextBoxColumn dgt = new DataGridTextBoxColumn();
dgt.ReadOnly = true;
I'm not an expert yet, but I play one at work. Yeah and here too.
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Thanks it worked!
Earlier I intended to do the same but mistakenly instead of setting the readonly property of the textboxColumn I was setting the readonly property of the textbox in the textboxColumn.
Suhas
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LOL
I'm not an expert yet, but I play one at work. Yeah and here too.
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As usual. Create an inherited DataGridTextBoxColumn and override Edit method to call base.Edit(...) only if Your another column has appropriate values.
Hi,
AW
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Hiya I want to use xp style controls and have been reading about using manifest files to do this.
But I can't get it to work for me. My project is called "form". ( a test!! )
These are the steps I have taken so far:
1. Opened new file in notepad and added (removed arrows for display. )
?xml version="1.0" standalone="yes"?
assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"
description>form/form
dependency
dependentAssembly
assemblyIdentity
type="win32"
name="Microsoft.Windows.Common-Controls"
version="6.0.0.0"
publicKeyToken="6595b64144ccf1df"
language="*"
processorArchitecture="X86" /
/dependentAssembly
/dependency
/assembly
2. Renamed this .txt file to form.exe.manifest
3. Copied the file in my project folder.
4. Set the controls FlatStyle to System.
But it still doesn't work. What am I doing wrong??
(version visual c# 1.0)
thanks
grahamoj.
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You may have put it in you "project" folder... But did you put it in your "Debug" folder???
/\ |_ E X E GG
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Is there any wayout to convert HTML to PDF?
clr.
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iSEDQuickPDF.com 65.00 for the control
I'm not an expert yet, but I play one at work. Yeah and here too.
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i have a new form inheriting from another form. the new form has a datagrid in it.
i'm creating a table style so my datagrid cells will fill the entire width, but my datagrid.width is not working correctly. it gives out a width entirely too small.
for example:
. . . . . . . .
DataGridTextBoxColumn ProductID = new DataGridTextBoxColumn();
ProductID.HeaderText = "Product";
ProductID.MappingName = "ProductID";
ProductID.Width = 100;
DataGridTextBoxColumn Comments = new DataGridTextBoxColumn();
Comments.HeaderText = "Comments";
Comments.MappingName = "Comments";
Comments.Width = dg.width - 100;
. . . . . . . .
the Comments column is very small. i've used this in other applications, but this one is acting funny. i'm wondering if it might have to do with the inheritance. ( note, the datagrid is not being inherited )
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well you have to account for row header size - a few pixels, plus it rounds. jusy play with it
Column.Width = dg.width - dg.rowheaderwidth -3;
I'm not an expert yet, but I play one at work. Yeah and here too.
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And next, autosize Your column in OnPaint method  . Another events work poor
Hi,
AW
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Hi guys,
Sorry to bother you with such a dumb question, I've been trying to figure it out for days now. All I want to do for an application is that after reading in data from a file (I've done), I want to graph it (I know how to graph) in different ways in different windows. Basically my question is how do I, upon user's command from a menu choice, bring up a new window, a new window and assign a certain view to that window.
In summary I have about 10 different views(with a different graph on each view). What I want to know is how do I, anytime a user wants to see one of them, display a new window on top(MDI) with the according view attached to that window.
Please could you reply with an answer.
Thank you respectfully
Raj Qbus Surendra
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hey dude its c#.net forum
I'm not an expert yet, but I play one at work. Yeah and here too.
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Does anyone knows how to create a class which will calculate Net Volumes from Pressure, Temperature and gas quality according to AGA (AGA-3, AGA-5 AND AGA-8) standards?
Thanks. Mike
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look up the formulas and move them into methods
I'm not an expert yet, but I play one at work. Yeah and here too.
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Hi
I am trying to load a texture from an image I get from a Web Service. D3D provides a method TextureLoader.FromStream using which you can load a texture from a stream. This is the code I wrote to load the texture:
imageRequest = (HttpWebRequest)WebRequest.Create(URL);
URL is something like http://terraservice.net/ogcmap.ashx?version=1.1.1&request=getmap&layers=drg&styles=utmgrid_yellow&srs=epsg:4326&bbox=-122.427,36.66,-117.756,38.947913&width=1000&height=500&format=image/jpeg
imageResponse = (HttpWebResponse)imageRequest.GetResponse();
imageStream = imageResponse.GetResponseStream(); // get a "Stream" from the "Response" object
TextureLoader.FromStream(device, imageStream);
But TextureLoader.FromStream() fn. Gives an error message that “stream does not allow seeking”
Then this is the second thing I tried:
imageRequest = (HttpWebRequest)WebRequest.Create(URL);
imageResponse = (HttpWebResponse)imageRequest.GetResponse();
imageStream = imageResponse.GetResponseStream(); // get a "Stream" from the "Response" object
byte[] buffer = new byte[imageResponse.ContentLength];
imageStream.Read(buffer, 0, (int) imageResponse.ContentLength);
// imageResponse.ContentLength is long so have to cast to int
MemoryStream stream = new MemoryStream(buffer);
texture = TextureLoader.FromStream(device, stream);
but imageResponse.ContentLength is always equal to -1. I was able to save the image by doing:
Image img = Image.FromStream(imageStream);
img.Save("c:/junk/texmap.jpg", ImageFormat.Jpeg);
and it came out fine when i opened it in photoshop.
Then I tried following code (replaced imageResponse.ContentLength by imageStream.Length):
imageRequest = (HttpWebRequest)WebRequest.Create(URL);
imageResponse = (HttpWebResponse)imageRequest.GetResponse();
imageStream = imageResponse.GetResponseStream(); // get a "Stream" from the "Response" object
byte[] buffer = new byte[imageStream.Length];
imageStream.Read(buffer, 0, (int) imageStream.Length);
MemoryStream stream = new MemoryStream(buffer);
texture = TextureLoader.FromStream(device, stream);
but this gives following error while trying to access imageStream.Length while executing
byte[] buffer = new byte[imageStream.Length];
exception of type 'System.NotSupportedException' occurred in system.dll
This stream does not support seek operations.
Any ideas what to do?
sid
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like whats the location of the wsdl?
I'm not an expert yet, but I play one at work. Yeah and here too.
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For getting Pictures from Webpages i use following Code:
---------------------------------------------------------------
WebRequest request = WebRequest.Create("<urltofetch>");
WebResponse response = request.GetResponse();
Stream stream = response.GetResponseStream();
Stream local = File.Create("filename.gif");
byte[] buffer = new byte[1024];
int n;
do
{
n = stream.Read(buffer, 0, buffer.Length);
local.Write(buffer, 0, n);
} while (n > 0);
stream.Close();
local.Close();
---------------------------------------------------------------
Where the url can be whatever you want ...
Hope this will help!
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How can I get rid of the beep that happens when I press enter on a form with no default button?
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Add a default button? It seems to me that every form should have a default button, no?
Cheers, Julian
Program Manager, C#
This posting is provided "AS IS" with no warranties, and confers no rights.
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Unless the application is a simple, one form, dialog application.
Have you tried catching the key down event?
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