Collection?

[nime]

How can I do a collection like thing in VB.NET

Struct StudentStruct
Id as Integer
Name as String
Class as String
End Struct

....

Dim Student as StudentStruct

Student.Add("Jo hn")
Student("John") .Class = "White"

[Jared Parsons [MSFT]]

Re: Collection?

Hello nime,

How can I do a collection like thing in VB.NET
>
Struct StudentStruct
Id as Integer
Name as String
Class as String
End Struct
...
>
Dim Student as StudentStruct
>
Student.Add("Jo hn")
Student("John") .Class = "White"

If you're using VS2005 then you could do the following

Dim student As New List(Of StudentStruct)

--
Jared Parsons [MSFT]
jaredpar@online .microsoft.com
All opinions are my own. All content is provided "AS IS" with no warranties,
and confers no rights.

[Phill W.]

Re: Collection?

nime wrote:

How can I do a collection like thing in VB.NET
>
Struct StudentStruct
Id as Integer
Name as String
Class as String
End Struct
>
Dim Student as StudentStruct
Student.Add("Jo hn")
Student("John") .Class = "White"

Since Student ID's should be unique, how about a HashTable?

Dim almuni As New HashTable
Dim student As StudentStruct

With student
.Id = 172
.Name = "John"
.Class = "VB 101"
End With
alumni.Add( student )

However, I'd suggest using a Class instead of a Structure, though. That
way, you can encapsulate [all] the property setting in a single
statement, as in

Class Student

Friend Sub New( _
ByVal iId as Integer _
, ByVal sName as String _
)
m_iId = iId
m_sName = sName
End Sub

Public ReadOnly Property Id() As Integer
Get
Return m_iId
End Get
End Property

Public ReadOnly Property Name() As String
Get
Return m_sName
End Get
End Property

Private m_iId as Integer = -1
Private m_sName as String = Nothing

End Class

.... then ...

Then

Dim almuni As New HashTable

alumni.Add( New Student( 172, "John" ) )

Or, you could create a constructor (Sub New) that took, say, a DataRow
and populated a Student object from that ...

HTH,
Phill W.

[nime]

Re: Collection?

Thank you for all replies, I think I can use SortedList and Structure



"Phill W." <p-.-a-.-w-a-r-d@o-p-e-n-.-a-c-.-u-kwrote in message news:e92u5c$hpr $1@yarrow.open. ac.uk...

nime wrote:

>How can I do a collection like thing in VB.NET
>>
>Struct StudentStruct
> Id as Integer
> Name as String
> Class as String
>End Struct
>>
>Dim Student as StudentStruct
>Student.Add("J ohn")
>Student("John" ).Class = "White"

>
Since Student ID's should be unique, how about a HashTable?
>
Dim almuni As New HashTable
Dim student As StudentStruct
>
With student
.Id = 172
.Name = "John"
.Class = "VB 101"
End With
alumni.Add( student )
>
However, I'd suggest using a Class instead of a Structure, though. That way, you can encapsulate [all] the property setting in a
single statement, as in
>
Class Student
>
Friend Sub New( _
ByVal iId as Integer _
, ByVal sName as String _
)
m_iId = iId
m_sName = sName
End Sub
>
Public ReadOnly Property Id() As Integer
Get
Return m_iId
End Get
End Property
>
Public ReadOnly Property Name() As String
Get
Return m_sName
End Get
End Property
>
Private m_iId as Integer = -1
Private m_sName as String = Nothing
>
End Class
>
... then ...
>
Then
>
Dim almuni As New HashTable
>
alumni.Add( New Student( 172, "John" ) )
>
Or, you could create a constructor (Sub New) that took, say, a DataRow and populated a Student object from that ...
>
HTH,
Phill W.