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Hi Guys, I have developed this application and now realized that it is going to cost me alot of memory. Could you please suggest me some ideas based on your expereince. So here is the scenario.
1. I am reading and loading alot of images and text from an one xml file about 500 images.
2. Loading each images as an item in a listbox (so user can scroll down and can see all the images)
3. If user select any of the items from the listbox i display that item and stuff related to that item (like text, images)
Problem:
Since I am loading an entire xml file in memory and on the top I am making all the listbox item that consume alot of memory. Currently what i am thinking is that I should make each listbox item as thumbnail and load in listbox simply, so this way will save some processing time like reading and geneating each item. I am not 100% sure though.
I am lookign your help.
Thanks
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You might want to take a look at using Virtualization on a ListView. There's a virtualization mode on the listview, which you may want to look into. To use this, you set VirtualMode = true; and VirtualListSize to some sensible amount. Then you hook up to the RetrieveVirtualItem event to load the next set of data in when you need it.
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I would suggest reading up on the Proxy pattern and Flyweight pattern:
Absolutely cache each thumbnail...only display/render those which are inside the controls viewport. No point in render 500 image thumbnails if only 30 are displayed at a time.
I'm finding the only constant in software development is change it self.
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Thanks for answering I got read about those proxy and flyweight pattern but meanwhile Some people are suggesting me to use Listview in it's virtual mode so only items being displayed inside the listview will be rendered.
So far i read about listview but i couldn't find that's acutally saying listview in virutal mode display render currently visible items.
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Father class in how to use the special sub-category of type (such as sub-class form on a table on the TableAdapter), the father of the current thinking is kind of like adding traversal of all the things (such as traversing the form of succession All controls), the need to find, it will need to transform the type to use it. But now they can not find this object into the type of need. Thanks a lot.
Code is as follows:
/ / Father traverse sub-class category on the form for the control and use it
private void findcontrol (Control.ControlCollection controls)
(
foreach (Control ctrl in controls) / / This traversal of a similar type of controls or components
(
if (ctrl.GetType (). Name == "customers TableAdapter") / / form on a table, the TableAdapter
(
/ / Ctrl-type into the TableAdapter customers to use
/ / Cases, TableAdapter.Update (customers DataTable);
/ / Ctrl like to, as with customers TableAdapter
)
findcontrol (ctrl.Controls);
)
)
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Hi,
I am working in an Internationalization project where I have to internationalize the phone numbers. The phone number entry would be in the following format.
<Country Code Dropdown based on ISO Standard based on which the country code would be populated> - <Area Code Textbox> - <Phone number Textbox> - <Extension Textbox> - <Phone Type Dropdown>
The phone type dropdown would contain Office Phone, Mobile Phone, Residence Phone among others. Based upon this we have to decide whether the area code exists. For ex, in India the mobile number is a complete 10 digit code(In near future it might also be 11 digits). In U.S mobile numbers has an area code. Alphanumerics can be used in U.S. In India, the area code might vary between 3-5 digits. The control should take care of all these based on the culture selected. The phone number should be stored with proper formatting(1-800-453-376-9876 in U.S, 91-9880098800 in India). The logic should take care of all these formattings. How could this be achieved?
The point to be noted is this should be done client side. We need to do only the formatting and not the validation. We are planning to use an XML file which would store all the formatting details of the countries based on which the controls can be rendered. We are also planning to build a WebcustomControl to build this so that it could be used while entry and display. Thanks for your time in reading this. Any replies appreciated. Once again thanks again.
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k_dasaprakash wrote: 1-800-453-376-9876 in U.S
Just so you know, that is not a valid format for US phone numbers. It is something like 1-800-123-4567 
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
"Not only do you continue to babble nonsense, you can't even correctly remember the nonsense you babbled just minutes ago." - Rob Graham
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Clientside? Is this distributed desktop app clientside, or web app? I assume you're talking web based, so you might want to consider how your validation will be done based on the culture. Where do you think you're actually going to be getting this from?
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Take a look for the E.164 numeric addressing scheme. It is what Microsoft uses in their new Office Communications Server product for number normalization.
It may help you in what you want to do as far as the rules.
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Hi,
I hope this helps you or at least someone.
I am by no means a professional programmer but more of an extreme hobbyist, but I have seen the phone number internationalization done and maybe I can relay the info...remember, I am self taught so I'm sure there will be holes in my explanation but the practice its self works.
I use this in an international logistics system, and instead of a drop down, we utilize a box where we can enter the countries ISO code (or select it from a grid). The format for the phone number is then set in the phone number field, whether that be phone, fax or mobile.
This is all done by 3 files; phonetypelist, phoneformatandvalidation, and phoneinfo.
PhoneTypeList contains the type of phone numbers, i.e. fax, phone, mobile and other.
PhoneFormatAndValidation contains the rules for formating the numbers and the functions for executing the conversion of 7134921212 to +1 713-492-1212. This file is pretty complex since it contains the rules, but it's a fairly small file (class), only 30 kb.
The file that contains the dataset is in this format:
If (PhoneInfo.fData Is Nothing) Then
PhoneInfo.fData = New PhoneInfoDataTable
Dim row As PhoneInfoRow = PhoneInfo.fData.NewPhoneInfoRow
row.CountryIsoCode = "AC"
row.CountryDialingCode = "247"
row.InternationalPrefix = "01"
row.NationalPrefix = ""
row.AreaCodeLength = 1
row.LocalNumberLength = 4
PhoneInfo.fData.Rows.Add(row)
row = PhoneInfo.fData.NewPhoneInfoRow
row.CountryIsoCode = "AD"
row.CountryDialingCode = "376"
row.InternationalPrefix = "00"
row.NationalPrefix = ""
row.AreaCodeLength = 1
row.LocalNumberLength = 6
Hopefully that helps, but if you need additional info, feel free to let me know.
Thanks,
Joe
modified on Tuesday, November 18, 2008 9:14 AM
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In the last two weeks, I was attempting to seek for an open source software with the requirement follow:
Platform: Win32
Language: C++ or C#
Module: Document Management & Knowledge Management
Structure: Client / Server, not Browser / Server
Detail: The Server can store user's files like doc/xls/ppt/txt/pdf/rtf, and provide fulltext search. The Client may easy to search, share Knowledge with others.
So far, I had found no opensource project can meet all the requirement, almost more than 70% opensource project is written in JAVA or PHP, of course Browser/Server structure.
Anyone who can give me a solusion?
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simonsinxer wrote: Anyone who can give me a solusion?
Study the projects you've seen and see how they work. Once you have a firm understanding write your own.
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
"Not only do you continue to babble nonsense, you can't even correctly remember the nonsense you babbled just minutes ago." - Rob Graham
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Would you consider LINQ as a Data access layer or business layer or all 2 of them?
I mean how would you incorporate LINQ to the three layer design? I have done a research on this question and would like to know what you think.
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LINQ is a query syntax. Its not a layer.
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Bassam Saoud wrote: I mean how would you incorporate LINQ to the three layer design?
Very, very carefully. Really, to do this, you need to disconnect the data context, otherwise the temptation is there for you to retrieve data in completely the wrong places.
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Would you recommend I do that? I mean, from an architecture point of view, would you consider using LINQ in your project(s) vs the clean 3 layer architecture and traditional ADO.NET?
sorry for not replying to your post earier, When you posted , I just voted it
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Bassam Saoud wrote: sorry for not replying to your post earier, When you posted , I just voted it
Don't worry about it.
Bassam Saoud wrote: I mean, from an architecture point of view, would you consider using LINQ in your project(s) vs the clean 3 layer architecture and traditional ADO.NET?
Well, we wrote a lot of do just this, and the more time goes by, the less happy I am with it. It's just such a bloody mess - and there's a lot of unnecessary wrangling going on. I must admit that I am looking at us moving actively back to ActiveRecord - or possibly EF.
We will still continue to use L4O though.
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Pete O'Hanlon wrote: Well, we wrote a lot of do just this, and the more time goes by, the less happy I am with it. It's just such a bloody mess
Yeah, I totally agree, Its a mess. I have read some good articles though like this MSDN Article[^], but still I dont like. I hope you would write an article about your experience 
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I was going to give away the data layer that we wrote, but frankly it's becoming a bit embarrassing.
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Well I would love to see an article Why not to use Linq or This is is how to use Linq in a three tier layer. I am sure many will be intersted in your experience
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When should a class access its own data members through a property rather than directly access them?
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Only when you really need to. Accessing through the property involves more work in the IL than actually directly accessing them.
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Pete O'Hanlon wrote: Only when you really need to.
 Ok, then when do you really need to? 
led mike
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CodingYoshi wrote: When should a class access its own data members through a property rather than directly access them?
Never. There is no such thing as "property" in C++.
led mike
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