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VB.NET need a class property to be a list array - part 2
sorry I dont know how to reopen post
This is related to the post:
VB.NET need a class property to be a list array (http://www.experts-exchange.com/Programming/Languages/.NET/Visual_Basic.NET/Q_27727643.html)
The solution that the expert give me works, but now I have another error:
"you did not controll nullreferenceexception" (sorry for my english)
this is the class with the change suggested for the expert
The problem is that if I remove the function "Public Sub New(ByVal ItemNo As String) " from the class vb and I tried to use it
Show me the following error:
"Too many arguments for Public sub new()"
This is related to the post:
VB.NET need a class property to be a list array (http://www.experts-exchange.com/Programming/Languages/.NET/Visual_Basic.NET/Q_27727643.html)
The solution that the expert give me works, but now I have another error:
"you did not controll nullreferenceexception" (sorry for my english)
this is the class with the change suggested for the expert
Public Class Item
Private _itemno As String
Public Property ItemNo() As String
Get
Return _itemno
End Get
Set(ByVal value As String)
_itemno = value
End Set
End Property
Public Sub New(ByVal ItemNo As String)
End Sub
End Class
Public Class Accessory
Private _items As List(Of Item)
Public Property Items() As List(Of Item)
Get
Return _items
End Get
Set(ByVal value As List(Of Item))
_items = value
End Set
End Property
Public Sub New()
_items = New List(Of Item)
End Sub
End Class
Public Class MasterItem
Private _item As Item
Public Property PrimaryItem() As Item
Get
Return _item
End Get
Set(ByVal value As Item)
_item = value
End Set
End Property
Private _accessories As Accessory
Public Property Accessories() As Accessory
Get
Return _accessories
End Get
Set(ByVal value As Accessory)
_accessories = value
End Set
End Property
End Class
The problem is that if I remove the function "Public Sub New(ByVal ItemNo As String) " from the class vb and I tried to use it
Show me the following error:
"Too many arguments for Public sub new()"
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If you remove your New function, you will get the error because there will be not method to receive the call to New Item("TESTACC1"). This is the New you are removing.
If you get rid of your function, you will then need to initialize your objects without a parameter:¸
testItem.Accessories.Items
If you get rid of your function, you will then need to initialize your objects without a parameter:¸
testItem.Accessories.Items
I think I need a break
I have been racking my brain trying this all day
hehehehehe
Im trying this because I would like to do a vb class how has several properties with diferents types like strings, doubles, arrays, etc...
Originally I try with arrays as properties in my class but I check and in diferents blogs several programmers says that I would be better I use a list as properties in my class instead of arrays.
That was Im checking how to use list as properties
This is what I have
I have been racking my brain trying this all day
hehehehehe
Im trying this because I would like to do a vb class how has several properties with diferents types like strings, doubles, arrays, etc...
Originally I try with arrays as properties in my class but I check and in diferents blogs several programmers says that I would be better I use a list as properties in my class instead of arrays.
That was Im checking how to use list as properties
This is what I have
Class data
Private dmyarray(,) As Boolean
Public Property myarray() As Boolean(,)
Get
Return dmyarray
End Get
Set(ByVal value As Boolean(,))
dmyarray = value
End Set
End Property
End Class
You have this as a new question now. What would you store in this property? You have many possible collection types that you can use.
hi codecruiser
As I say
In the original project for example:
I had several variables and several arrays that allow me to do some operations.
the data saved on this variables and arrays allows to create a graph.
When the work is finished the data is saved in xml files that represent the graphs (this is not a database).
This xml files the user can move it to others computers with the same program recreate the graphs or make a new ones.
--------------------------
In the new version the idea is that in a main project I have a treeview, and when I add a new branch I need to use the same variables and arrays.
but what happend if I add a new branch????, thats way I create a class with several properties that represents the variables and the arrays.
right now Im using arrays in my properties and they works great, but checking in several blogs many programmers says that it is not the best idea if that I use arrays that it would be better if I use a bidimensional list as a properties in my class
best regards
As I say
In the original project for example:
I had several variables and several arrays that allow me to do some operations.
the data saved on this variables and arrays allows to create a graph.
When the work is finished the data is saved in xml files that represent the graphs (this is not a database).
This xml files the user can move it to others computers with the same program recreate the graphs or make a new ones.
--------------------------
In the new version the idea is that in a main project I have a treeview, and when I add a new branch I need to use the same variables and arrays.
but what happend if I add a new branch????, thats way I create a class with several properties that represents the variables and the arrays.
right now Im using arrays in my properties and they works great, but checking in several blogs many programmers says that it is not the best idea if that I use arrays that it would be better if I use a bidimensional list as a properties in my class
best regards
Without looking at all your code, I think DataTables may be more suitable for you given that you have graphs(data points) and XML involved.
datatable it is not a option beacause every the program not need a database.
My program create xml files as excel create xls files or word create doc files.
My program create xml files as excel create xls files or word create doc files.
You do not need a database to use a DataTable:
Dim yourTable As New DataTable
yourTable.ReadXml("yourXML
'Work
yourTable.WriteXml("yourXM
Dim yourTable As New DataTable
yourTable.ReadXml("yourXML
'Work
yourTable.WriteXml("yourXM
ok thanks thats a great idea, im gonna use it in this project
but it is not what I mean for this issue
I think that I need to explain my self a little better
this is an example of my class
when the user introduce data in the branch I use the following code
if the user wants, he can add a new branch where he can prepare another graphs and solve another math algorithms, at this point the program needs to use the same variables and arrays but using other values.
Because the user can work with both branch at same time thats way I create a custom class with that can handle all this variables and arrays.
When the user finished if he wants he can save their work, at this point I use xml file to save the information storage in my class.
At this point the class and the dictionary works great and without a problem.
But searching options on internet to improve my code, I read that Many programmers in diferents blogs says that it is better to use list instead of arrays
Thats way Im tring to explore the optio to use generic list as properties in my class instead of arrays as properties in my class
but it is not what I mean for this issue
I think that I need to explain my self a little better
this is an example of my class
Public Class data
Private dmyarray1(,) As String
Public Property myarray1() As String(,)
Get
Return dmyarray1
End Get
Set(ByVal value As String(,))
dmyarray1 = value
End Set
End Property
Private dmyname As String
Public Property myname() As String
Get
Return dmyname
End Get
Set(ByVal value As String)
dmyname = value
End Set
End Property
Private dmydouble As Double
Public Property mydouble() As Double
Get
Return dmydouble
End Get
Set(ByVal value As Double)
dmydouble = value
End Set
End Property
End Class
when the user introduce data in the branch I use the following code
Dim newtest As new data
newtest.myname = "Carlos" & str(indexbranch)
newtest.myarray1(0, 0) = "4.5"
newtest.mydouble = 4.5
mydictionary.add(newtest.myname,newtest)
if the user wants, he can add a new branch where he can prepare another graphs and solve another math algorithms, at this point the program needs to use the same variables and arrays but using other values.
Because the user can work with both branch at same time thats way I create a custom class with that can handle all this variables and arrays.
When the user finished if he wants he can save their work, at this point I use xml file to save the information storage in my class.
At this point the class and the dictionary works great and without a problem.
But searching options on internet to improve my code, I read that Many programmers in diferents blogs says that it is better to use list instead of arrays
Thats way Im tring to explore the optio to use generic list as properties in my class instead of arrays as properties in my class
>I read that Many programmers in diferents blogs says that it is better to use list instead of arrays
That does not just apply to everyone. Arrays exist for a reason. If arrays are doing the job for you and you do not have any issues then I think you do not need to convert to lists.
That does not just apply to everyone. Arrays exist for a reason. If arrays are doing the job for you and you do not have any issues then I think you do not need to convert to lists.
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