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I have this table (with the price for sending a letter to different countries):
WEIGHT Denmark Europe Other Countries
---------------------------------------------
50 g | 6,00 10,50 13,50
100 g | 8,25 15,00 21,00
250 g | 13,50 24,00 36,50
500 g | 22,50 40,00 59,00
1000 g | 30,00 66,00 100,00
I need to be able to type which country i want to send a letter to in a console, 1 = Denmark for instance. Then specify the weight of the letter, 120 for instance, and then the program will output 13,50.
What is the best way to deal with this if i also want to be able to edit, delete or add prices, weigthts and countries? Normally i would create a database dealing with this, but i'm trying to figure out some more advanced List<>'s in C#. A hint would be great so i could figure out the rest myself. I've tried to figure out how to automatically assign id's to custom classes when added to a List<>, but i can't seem to find a solution. Is it even the right way to do this?
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Jan Sommer wrote: Is it even the right way to do this?
Arguably no. You had the right idea to start with - a database is for this sort of thing.
However, if this is just an excercise in understanding generic List's then you just create a class which holds the relevant data, store it in a list, and serialize that list to the filesystem for the purpose of storage.
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Well the program doesn't have to save the data on the filesystem, it should only be stored in memory.. i could ofcourse use your method and delete the file afterwords..
but how do i relate the price to weight and country? i'm pretty lost on that part. i can't relate them through their index, because if a weight or country gets deleted, then i'm in trouble.
EDIT: and it's kind of stupid to assign id's myself.. there -must- be a way to do it automatically ??
modified on Monday, September 15, 2008 5:12 AM
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Which part of your data is most constant? Once you've decided that you should build your classes around that.
For example - if the weights will rarely change, but you are likely to be adding and removing countries then I'd go for something like...
public class WeightCollection : List<Weight>
{
}
public struct Weight
{
public Weight(int grammes, List<CountryCost> costs)
{
}
}
public struct CountryCost
{
public CountryCost(string country, decimal cost)
{
}
}
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Expect everything to be hard and then enjoy the things that come easy. (code-frog)
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Thanks!
i'll see if i can figure it out. Is a struct the way to go with this, and why not use a class?
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It doesn't really make any difference, classes are easier to deal with though.
I tend to use structs for all my values (structs are value types) and classes for the final objects that use those values. I personally find this makes more sense, but unless you're 100% sure you're handling value types correctly - use classes.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Expect everything to be hard and then enjoy the things that come easy. (code-frog)
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lb_MSNo is linkbutton in the Machine Warranty Formview.
Why the servicing_details formview still didn't appear?
[^]
protected void lb_MSNo_Click(object sender, EventArgs e)
{
OdbcCommand cmd; OdbcDataReader reader;
//OdbcConnection connection = WebConfigurationManager.GetConnectionObject();
OdbcConnection connection = new OdbcConnection();connection.ConnectionString = WebConfigurationManager.ConnectionStrings["TamiConnectionString"].ConnectionString;
try
{
LinkButton a = (LinkButton)FV_ResultsS.FindControl("lb_MSNo");
string mw = "SELECT job_id FROM machine_warranty, warranty_period, job WHERE machine_warranty.machine_warranty_id= warranty_period.machine_warranty_id and Machine_SerialNo=" + a.Text + " and job.machine_warranty_id = Machine_Warranty.Machine_Warranty_ID AND machine_warranty.machine_warranty_id=job.machine_warranty_id";
connection.Open();
using (cmd = new OdbcCommand(mw, connection))
{
reader = cmd.ExecuteReader();
while (reader.Read())
{
mw = reader.GetInt32(0).ToString();
}
}
connection.Close();
ds_ServinMW.SelectCommand = "SELECT servicing_id, job.job_id, job_status, job_type, job_no, date_format(Date_Serviced,'%Y-%m-%d') as date_serviced, date_format(date_job_issued,'%Y-%m-%d') as date_job_issued, remarks FROM job, servicing_details, machine_warranty WHERE servicing_details.job_id=job.job_id and job.machine_warranty_id=Machine_Warranty.Machine_Warranty_ID AND job.job_id = "+ mw;
ds_ServinMW.DataBind();
}
catch
{ }
finally
{
connection.Dispose();
}
string test = ds_ServinMW.SelectCommand;
FV_servinMW.DataBind();
FV_servinMW.Visible = true;
}
}
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try putting your code in pre tags, else most of us wont even read it
Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)
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Hi all,
can any one guide me on ways to implement the this feature.
In textbox when ever we type some characters , all the entries mathcing to the entered charcters(from database) appear below the text box and user can select ne of the given entry.
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Every string has an IndexOf method to find index of a particular word or character.
So you can search for index of a string in a text box like this –
textBox1.Text.IndexOf("FindThisWord", 0);
-Dave.
------------------------------------
http://www.componentone.com
------------------------------------
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I want a application with OPENGL functionality that too developed in c#.net.
Please give the me some ideas regarding the enviroment setup, dll's required etc.
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You may want to check out the Tao Framework[^], it's a OpenGL wrapper for .NET.
regards
modified 12-Sep-18 21:01pm.
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I know that the Graphics class cannot take indexed images (I dont really know why). So I need to convert the indexed image to a color image, then convert it back to indexed image.
How would I go about doing this conversion into color then back into indexed? Would there be data loss during the conversions?
When i was doing it using Photoshop, every time i switched between indexed and RGB, the image got darker and darker, which meant data wasn't being preserved.
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gigahertz205 wrote: I know that the Graphics class cannot take indexed images
Are you sure?
Indexed to RGB shouldn't cause any visible change.
RGB to indexed may cause a change, since a best-fit color table
needs to be created.
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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How can I find a Unicode Code of a chracter in a string
For exmple Unicode of (њ) is 5A 04
Is there any way to find it programmatically
Hello Friends
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You can use the Encoding class, like this:
byte[] bytes = Encoding.UTF8.GetBytes("њ");
I haven't tested it, so the syntax might be a little bit different.
regards
modified 12-Sep-18 21:01pm.
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Thanks alot.
it worked
Now I want to convert this code to hex. How can I do it?
Hello Friends
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Convert it to int like Guffa said, then display it as hex. To display an int as hex i think you can use .ToString('X');
My current favourite word is: Nipple!
-SK Genius
Game Programming articles start - here[ ^]-
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SK Genius wrote: .ToString('X');
That works fine - I prefer Convert.ToString(value, base) as you don't have to remember the silly string formats and you can specify base 2, 8, 10 or 16 so is more flexible. 
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Expect everything to be hard and then enjoy the things that come easy. (code-frog)
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Characters are unicode, so you can just convert it to int:
int code = (int)'њ';
Despite everything, the person most likely to be fooling you next is yourself.
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It is probably better to use: char.ConvertToUtf32(string, int)
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but why?
i also usually cast the char to int to get its unicode value
Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)
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Harvey Saayman wrote: but why?
Because .NET has Unicode surrogate pairs, meaning sometimes it takes 2 combined characters to form a complete Unicode code point.
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Hello
I wna tto show a gif file in my C# aplication but is is not in animated form.
Can any one have the idea about that????
Thanks
Syed Shahid Hussain
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Use a picture box to show Gif image, it will show animation effect.
-Dave.
------------------------------------
http://www.componentone.com
------------------------------------
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