HOW TO：建立項目清單
本主題中的程式碼會定義 Student 類別 (Class)，並建立該類別的執行個體 (Instance) 清單。 這份清單旨在支援逐步解說：在 Visual Basic 中撰寫查詢主題。 但也適用於任何需要物件清單的應用程式。 這個程式碼會使用物件初始設定式來定義學生清單中的項目。
範例
如果您正在使用逐步解說，可以將這個程式碼用在該處建立之專案的 Module1.vb 檔案中。 只要將 Main 方法中標有 **** 的行，取代為逐步解說中提供的查詢及查詢執行即可。
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(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
請參閱
工作
概念
物件初始設定式：具名和匿名型別 (Visual Basic)