How to: Create a List of Items
The code in this topic defines a Student class and creates a list of instances of the class. The list is designed to support the topic Walkthrough: Writing Queries in Visual Basic. It also can be used for any application that requires a list of objects. The code defines the items in the list of students by using object initializers.
Example
If you are working on the walkthrough, you can use this code for the Module1.vb file of the project that is created there. Just replace the lines marked with **** in the Main method with the queries and query executions that are provided in the walkthrough.
Module Module1
Sub Main()
' Create a list of students.
Dim students = GetStudents()
' Display the names in the list.
DisplayList(students)
' ****Paste query and query execution code from the walkthrough,
' ****or any code of your own, here in Main.
Console.ReadLine()
End Sub
' Call DisplayList to see the names of the students in the list.
' You can expand this method to see other student properties.
Sub DisplayList(ByVal studentCol As IEnumerable(Of Student))
For Each st As Student In studentCol
Console.WriteLine("First Name: " & st.First)
Console.WriteLine(" Last Name: " & st.Last)
Console.WriteLine()
Next
End Sub
' Function GetStudents returns a list of Student objects.
Function GetStudents() As IEnumerable(Of Student)
Return New List(Of Student) From
{
New Student("Michael", "Tucker", "Junior", 10),
New Student("Svetlana", "Omelchenko", "Senior", 2),
New Student("Michiko", "Osada", "Senior", 7),
New Student("Sven", "Mortensen", "Freshman", 53),
New Student("Hugo", "Garcia", "Junior", 16),
New Student("Cesar", "Garcia", "Freshman", 4),
New Student("Fadi", "Fakhouri", "Senior", 72),
New Student("Hanying", "Feng", "Senior", 11),
New Student("Debra", "Garcia", "Junior", 41),
New Student("Lance", "Tucker", "Junior", 60),
New Student("Terry", "Adams", "Senior", 6)
}
End Function
' Each student has a first name, a last name, a class year, and
' a rank that indicates academic ranking in the student body.
Public Class Student
Public Property First As String
Public Property Last As String
Public Property Year As String
Public Property Rank As Integer
Public Sub New()
End Sub
Public Sub New(ByVal firstName As String,
ByVal lastName As String,
ByVal studentYear As String,
ByVal studentRank As Integer)
First = firstName
Last = lastName
Year = studentYear
Rank = studentRank
End Sub
End Class
End Module
See Also
Tasks
Walkthrough: Writing Queries in Visual Basic
Concepts
Object Initializers: Named and Anonymous Types (Visual Basic)
Introduction to LINQ in Visual Basic
Other Resources
Video How to: Writing Queries in Visual Basic