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You're missing that the data is not being hidden.
If you WANT the array to be changed by an eternal class, then expose it, but it's not a great idea.
If you want the elements to be exposed then use a method that hides the implimentation.
Panic, Chaos, Destruction.
My work here is done.
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Aha, so that's what mutability is. I've heard the term and read the quick definition - something like "a mutable class is one of which the contents can change". Duh! That hardly sounds like a useful description. At least now I have a practical example of where it becomes significant. Thanks.
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Dewald wrote: now I have a practical example of where it becomes significant.
Objects of the String class are immutable, and used quite often...that's a pretty
significant practical example 
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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Cool, now I have two examples, thanks 
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Hello everyone,
I understand in the rule of C#, we are not allowed to add public/private/protected qualifier to methods in interface. My question is why adding the qualifiers are not allowed? I want to know the reason behind the claimed rule, i.e. what issues will be if we are allowed to add qualifier?
thanks in advance,
George
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There is no purpose of having qualifiers for the members of an interface. If they are not public, they are not useable at all.
A private member doesn't make sense at all. Making a member protected would only force you to implement it, but it would not be reachable for any code that uses the interface.
Despite everything, the person most likely to be fooling you next is yourself.
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Thanks Guffa!
1.
I can understand that you mean if interface method is marked as private, then the implementation must be private and the implementation could not be accessed from outside? Is that your point?
2.
My confusion is what do you mean "Making a member protected would only force you to implement it, but it would not be reachable for any code that uses the interface."? Could you show some pseudo code to describe your ideas please?
regards,
George
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Anything that's private in an object can only be accessed by that object itself so it is pointless in an interface as is protected as they can only be accessed by the class itself or ones derived from it.
I thought about this too when I first used interfaces. If all the objects that are going to implement the interface will have a specific private method for example then it makes sense to put the private method in the interface so each object has to implement it... If that were possible, it would save alot of typing (or copying/pasting) sometimes but that's not what interfaces are for!
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
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Hi Dave!
I disagree with you that in the implementation, we could provide accessor like private, here is my code with compile error when we add private qualifier to implementation method. Any comments?
interface IFoo
{
void Abc();
}
class Foo : IFoo
{
private void IFoo.Abc()
{
}
}
D:\Visual Studio 2008\Projects\TestInterface2\TestInterface2\Program.cs(15,22): error CS0106: The modifier 'private' is not valid for this item
regards,
George
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Exactly my point - we can't because it would be pointless.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
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Thanks Dave!
1.
Last confirmation, both methods in interface and methods in implementation class must be private?
2.
interface IFoo
{
void Abc();
}
class Foo : IFoo
{
private void Abc() {}
void IFoo.Abc() { this.Abc(); }
}
If yes to 1, I disagree. I did some investigation, seems when there is both implicit and explicit implementation, we could have a private implementation?
regards,
George
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Hello everyone,
I have one confusion about strongly named assembly.
Suppose I am developing a library (DLL), and other application is linked with it (reference to the library DLL), my purpose is not to make the dependent application rebuild if I do not change the interface exposed to the application.
(i.e. if I just changed the implementation of the exposed interface and keep interface the same, application developer just need to copy my new library DLL, all other changes are transparent to application, and no need to rebuild.)
My question if I made the DLL strongly named, even if I keep the exposed interface the same (just change interface implementation), the application needs to rebuild? Why?
thanks in advance,
George
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I want to build an application that can access the above mentioned contact list so a user can select multiple emails based off their existing address books.
Can anyone point me into the right direction for accessing those stored contacts?
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Have you already looked into VSTO (Visual Studio Tools for Office)?
Regards,
Thomas Stockwell
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Visit my Blog
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No I haven't, do you have a url to VSTO?
Are you referring to http://msdn.microsoft.com/en-us/office/aa905533.aspx
or http://msdn.microsoft.com/en-us/library/d2tx7z6d(VS.80).aspx
?
If so, I trust they are both compatible with vs2008?
Thanks for the speedy informative reply! +5
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The links that you posted look like they are for the VSTO msdn sections. VSTO is the premier Office authoring tool for Office 2007,2003. VSTO for VS2003 can target Office2003, VSTO for VS2005 can target Office2003, VSTOse2 for VS2005 can taget both offices, VSTO for VS2008 can taget both as well. VSTO comes depending upon the version of Visual Studio you have installed.
I personally have VS2008Pro (free to college students if you signup for DreamSpark[^]). This Visual Studio fully supports VSTO that can target Office 2003, 2007.
Regards,
Thomas Stockwell
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Visit my Blog
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Hey thanks buddy that really helped a lot, I'm a university student and this will save me a bundle (if applicable, I don't see why it wouldn't.)
Thanks again!
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I was looking for somewhere to find out how to do some things with Visual Studio 2008. I know most people recommend downloading/paying for a better installer elsewhere but I just cannot afford it at this present time.
Im just curious about during a setup, I want to create a database. I see how you can add a custom action and there I could put my sql query based upon the users input for the server/username/password. Now if it is successfull then how do I integrate it into the application after install so the application will know where to look for it? That is for a Windows application. So how would I integrate it into the web.config for a web application so it knows what server to look for?
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Jacob Dixon wrote: I want to create a database.
For creating a database, take the sql scripts and store in a sql file.
Jacob Dixon wrote: I see how you can add a custom action
For making database at run time i would recommend you to create a windows project and add its output in custom actions. Right click on set-up project and add custom actions.
Jacob Dixon wrote: put my sql query based upon the users input for the server/username/password
You can put this interface in the windows project you made above.
Jacob Dixon wrote: how do I integrate it into the application after install so the application
Add it in custom actions and it will run on setup.
Jacob Dixon wrote: So how would I integrate it into the web.config for a web application
simply add the file in setup project
Ahsan Ullah
Senior Software Engineer
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Jacob Dixon wrote: I know most people recommend downloading/paying for a better installer elsewhere but I just cannot afford it at this present time.
Take a look at Inno Setup[^]. It's free and very powerful. I've used it for years.
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I have DataGridView in virtual mode containing 3500 rows.
In code below, assigning to RowCount value to 3500 takes 8 seconds.
CPU usage goes high at this time.
Stepping by F11 into user code shows few celltemplate property getters and
combobox/datecombo constructor calls without database access which does not
take a lot of time.
Debug output (below) shows lot of messages Stepping over non-user code.
Running in release mode from Windows this line speed is same (slow).
How to speed up grid creation ?
Using C# Express 2008 3.5 SP1 in Vista.
class Grid : System.Windows.Forms.DataGridView {
internal void SetDataRetriever(DataRetriever<TEntity> dataRetriever)
{ ......
SuspendLayout();
Enabled = false;
int cnt = DataRetriever.RowCount + (ReadOnly ? 0 : 1);
RowCount = cnt;
Enabled = true;
ResumeLayout();
}
protected override void
OnCellValueNeeded(DataGridViewCellValueEventArgs e)
{
if (!Enabled)
return;
...
}
protected override void OnRowEnter(DataGridViewCellEventArgs e)
{
if (!Enabled)
return;
...
}
}
Debug output window contains:
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.RowCount.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DataGridViewComboBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.FlatStyle.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DisplayStyleForCurrentCellOnly.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewColumn.CellTemplate.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DataGridViewComboBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.FlatStyle.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DisplayStyleForCurrentCellOnly.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.CompleteCellsCollection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.RowTemplateClone.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRowCollection.Add'
Step into: Stepping over non-user code
'System.Windows.Forms.Control.Enabled.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.OnRowEnter'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetCurrentCellAddressCore'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetAndSelectCurrentCellAddress'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DataGridViewComboBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.FlatStyle.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DisplayStyleForCurrentCellOnly.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.DataGridViewTextBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.PropertyStore.GetObject'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewCell.Style.get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewTextBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DataGridViewComboBoxCell'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.FlatStyle.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.DisplayStyleForCurrentCellOnly.set'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewComboBoxCell.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.CloneCells'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRow.Clone'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRowCollection.this[int].get'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetSelectedCellCore'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetSelectedElementCore'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.ClearSelection'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.SetAndSelectCurrentCellAddress'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridView.OnRowCollectionChanged_PostNotification'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRowCollection.InsertCopiesPrivate'
Step into: Stepping over non-user code
'System.Windows.Forms.DataGridViewRowCollection.Add'
Andrus
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I'm trying to make an FTP program in C#. The only class to use in C# is FtpWebRequest.
For each connection I start a new thread which opens the FTP connection and uploads or downloads.
But when finishing the upload routine and testing it, it seems FtpWebRequest only handles 2 connections, a 3rd or 4th upload hangs in the GetRequestStream function.
I tried setting the ServicePoint.ConnectionLimit to 4 but that doesn't help and I can't find any other methods of changing this apparent connection limit.
It's not a problem of the ftp server I connect to, because other ftp programs can do more than 2 connections to that server. I even set the MaxConnectionsPerServer keys in the registry (on this pc and the server, allthough I believe these are meant for http download connections, not ftp, but I'm thinking maybe FtpWebRequest isn't true ftp ?)
And apparently I'm the only one with this problem, cause I cannot find any mention of this on google.
Anybody got any ideas ?
Oh, and by the way, its pretty slow too, is that a known issue ?
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That is a builtin OS limitation.
xacc.ide - now with TabsToSpaces support IronScheme - 1.0 beta 1 - out now! ((lambda (x) `((lambda (x) ,x) ',x)) '`((lambda (x) ,x) ',x))
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Could you elaborate ? is this documented somewhere ?
If you mean the maxconnectionsperserver key in the registry, I already increased it and it doesn't help.
Besides like I said, other ftp programs can do a lot more connections, so that would mean ftpwebrequest is not real ftp.
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quorton wrote: Could you elaborate ? is this documented somewhere ?
I dont know where it is documented. It is a well known fact.
quorton wrote: I already increased it and it doesn't help.
Do you not understand LIMITATION? In others words, there is nothing you can do about it.
xacc.ide - now with TabsToSpaces support IronScheme - 1.0 beta 1 - out now! ((lambda (x) `((lambda (x) ,x) ',x)) '`((lambda (x) ,x) ',x))
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