Shop Code - List Of Selected Products Will Be Saved In A .text File
Jul 31, 2008
I've got 2 seperated programs.
One is a program where you can select a product and select how many of them you want. Then the total price wil be displayedin a label. And the list of selected products will be saved in a .txt file.
The second program is an Edit program. The user can edit his selected products. Here he can change the total of a product.So if he had selected 1, he can change it to three or something. When the user clicks the button Save. The changes will besaved in the same .txt file and the total price will also be changed and displayed in program one.
Program one is compleet.Program two has problems and here i need your help:- the user can't make a change in the numbers, seems that the textbox is read-only or something. How to solve?- Then when i click save, the changed must be saved in the .txt ( i can't test this yet because no changes can't be made)- the total new price must be showed in program 1 (i think i programmed this well, but can you take a look)
Here is a part of my code of program 1:
CODE:
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I think (?) this is about object design, and perhaps about structural and/or creational patterns. But a bit hard to say when I only know a couple of patterns yet.[code]But... what if we INSTEAD want each Product instance only to (in some way) refer to one instance of a specific list of Components. So we wan't to save the products list to one file, and the components list to another file. Then would I build the objects the same way, or different? So let's then say we have now Class B as below. [code]
1. Will not need to update each component variable of the products list when the components list changes.
2. If the Product object shall be shown in a DataGridView, for editing properties, it seems easier to implement the selection of the component property.
Is this wrong approach? Is it suitable in some cases, and if so, when? Are there other solutions I perhaps am not aware of that would be appropriate? Is this about structural design patterns? and if so, can the alternatives above be catagorized to some pattern type? I don't really know exactly what I'm looking for.. But I think probably I'm looking to understand whether the object design will be determined by the way the objects are saved.. And if i shall save the objects by serializing to file, vs saving to a database, would I create the business objects differently?
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[Code]...
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[code]....
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[code]...
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[code]....
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[Code]....
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[code]....
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