VB.Net by API/System.Collections/ArrayList — различия между версиями

Материал из VB Эксперт
Перейти к: навигация, поиск
м (1 версия)
 
м (1 версия)
 
(нет различий)

Текущая версия на 12:51, 26 мая 2010

ArrayList.Add

  

Imports System
Imports System.Collections
Public Class MainClass
    
    Shared Sub Main()
       Dim empArray As New ArrayList(  )
       Dim intArray As New ArrayList(  )
       "populate the arraylists
       Dim i As Integer
       For i = 0 To 4
           empArray.Add(New Employee(i + 100))
           intArray.Add((i * 5))
       Next i
       "print each member of the array
       For Each i In intArray
           Console.Write("{0} ", i.ToString(  ))
       Next i
       Console.WriteLine(ControlChars.Lf)
       "print each employee
       Dim e As Employee
       For Each e In empArray
           Console.Write("{0} ", e.ToString(  ))
       Next e
       Console.WriteLine(ControlChars.Lf)
       Console.WriteLine("empArray.Capacity: {0}", empArray.Capacity)
   End Sub
End Class
     Public Class Employee
         Private myEmpID As Integer
         Public Sub New(ByVal empID As Integer)
             Me.myEmpID = empID
         End Sub "New
         Public Overrides Function ToString(  ) As String
             Return myEmpID.ToString(  )
         End Function "ToString
         Public Property EmpID(  ) As Integer
             Get
                 Return myEmpID
             End Get
             Set(ByVal Value As Integer)
                 myEmpID = Value
             End Set
         End Property
     End Class "Employee


ArrayList.Capacity

  

Imports System
Imports System.Collections
Public Class MainClass
    
    Shared Sub Main()
       Dim empArray As New ArrayList(  )
       Dim intArray As New ArrayList(  )
       "populate the arraylists
       Dim i As Integer
       For i = 0 To 4
           empArray.Add(New Employee(i + 100))
           intArray.Add((i * 5))
       Next i
       "print each member of the array
       For Each i In intArray
           Console.Write("{0} ", i.ToString(  ))
       Next i
       Console.WriteLine(ControlChars.Lf)
       "print each employee
       Dim e As Employee
       For Each e In empArray
           Console.Write("{0} ", e.ToString(  ))
       Next e
       Console.WriteLine(ControlChars.Lf)
       Console.WriteLine("empArray.Capacity: {0}", empArray.Capacity)
   End Sub
End Class
     Public Class Employee
         Private myEmpID As Integer
         Public Sub New(ByVal empID As Integer)
             Me.myEmpID = empID
         End Sub "New
         Public Overrides Function ToString(  ) As String
             Return myEmpID.ToString(  )
         End Function "ToString
         Public Property EmpID(  ) As Integer
             Get
                 Return myEmpID
             End Get
             Set(ByVal Value As Integer)
                 myEmpID = Value
             End Set
         End Property
     End Class "Employee


ArrayList.Contains

  

Imports System
Imports System.Collections
Public Class MainClass
   Public Shared Sub Main()
      Dim arrayList As arrayList = New arrayList(1)
      arrayList.Add("a")
      try
          Console.WriteLine(arrayList(0))
      Catch outOfRange As ArgumentOutOfRangeException
          Console.WriteLine(outOfRange.ToString())
      End Try
      Console.WriteLine(arrayList.Count)
      Console.WriteLine(arrayList.Contains("a"))
      
      Console.WriteLine(arrayList.IndexOf("a"))
      arrayList.Remove("a")
      arrayList.TrimToSize()
      Console.WriteLine(arrayList.Capacity)
      arrayList.Add("a")
      Dim enumerator As IEnumerator = arrayList.GetEnumerator()
      While enumerator.MoveNext()
         Console.WriteLine(enumerator.Current )
      End While 
   End Sub
End Class


ArrayList.Count

  
Imports System
Imports System.Collections
Public Class MainClass
   Public Shared Sub Main()
      Dim arrayList As arrayList = New arrayList(1)
      arrayList.Add("a")
      try
          Console.WriteLine(arrayList(0))
      Catch outOfRange As ArgumentOutOfRangeException
          Console.WriteLine(outOfRange.ToString())
      End Try
      Console.WriteLine(arrayList.Count)
      Console.WriteLine(arrayList.Contains("a"))
      
      Console.WriteLine(arrayList.IndexOf("a"))
      arrayList.Remove("a")
      arrayList.TrimToSize()
      Console.WriteLine(arrayList.Capacity)
      arrayList.Add("a")
      Dim enumerator As IEnumerator = arrayList.GetEnumerator()
      While enumerator.MoveNext()
         Console.WriteLine(enumerator.Current )
      End While 
   End Sub
End Class


ArrayList.GetEnumerator

  

Imports System
Imports System.Collections
Public Class MainClass
   Public Shared Sub Main()
      Dim arrayList As arrayList = New arrayList(1)
      arrayList.Add("a")
      try
          Console.WriteLine(arrayList(0))
      Catch outOfRange As ArgumentOutOfRangeException
          Console.WriteLine(outOfRange.ToString())
      End Try
      Console.WriteLine(arrayList.Count)
      Console.WriteLine(arrayList.Contains("a"))
      
      Console.WriteLine(arrayList.IndexOf("a"))
      arrayList.Remove("a")
      arrayList.TrimToSize()
      Console.WriteLine(arrayList.Capacity)
      arrayList.Add("a")
      Dim enumerator As IEnumerator = arrayList.GetEnumerator()
      While enumerator.MoveNext()
         Console.WriteLine(enumerator.Current )
      End While 
   End Sub
End Class


ArrayList.IndexOf

  
Imports System
Imports System.Collections
Public Class MainClass
   Public Shared Sub Main()
      Dim arrayList As arrayList = New arrayList(1)
      arrayList.Add("a")
      try
          Console.WriteLine(arrayList(0))
      Catch outOfRange As ArgumentOutOfRangeException
          Console.WriteLine(outOfRange.ToString())
      End Try
      Console.WriteLine(arrayList.Count)
      Console.WriteLine(arrayList.Contains("a"))
      
      Console.WriteLine(arrayList.IndexOf("a"))
      arrayList.Remove("a")
      arrayList.TrimToSize()
      Console.WriteLine(arrayList.Capacity)
      arrayList.Add("a")
      Dim enumerator As IEnumerator = arrayList.GetEnumerator()
      While enumerator.MoveNext()
         Console.WriteLine(enumerator.Current )
      End While 
   End Sub
End Class


ArrayList.Remove

  
Imports System
Imports System.Collections
Public Class MainClass
   Public Shared Sub Main()
      Dim arrayList As arrayList = New arrayList(1)
      arrayList.Add("a")
      try
          Console.WriteLine(arrayList(0))
      Catch outOfRange As ArgumentOutOfRangeException
          Console.WriteLine(outOfRange.ToString())
      End Try
      Console.WriteLine(arrayList.Count)
      Console.WriteLine(arrayList.Contains("a"))
      
      Console.WriteLine(arrayList.IndexOf("a"))
      arrayList.Remove("a")
      arrayList.TrimToSize()
      Console.WriteLine(arrayList.Capacity)
      arrayList.Add("a")
      Dim enumerator As IEnumerator = arrayList.GetEnumerator()
      While enumerator.MoveNext()
         Console.WriteLine(enumerator.Current )
      End While 
   End Sub
End Class


ArrayList.ToArray()

  
Imports System
Imports System.Collections

Public Class MainClass
    
    Shared Sub Main(ByVal args As String())
        Dim array_list As New ArrayList
        array_list.Add("A")
        array_list.Add("B")
        array_list.Add("C")
        " Array of objects.
        Dim obj_array() As Object
        obj_array = array_list.ToArray()
        " Array of strings.
        Dim string_array() As String
        string_array = DirectCast(array_list.ToArray(GetType(String)), String())
        " Array object of objects.
        Dim astring_array As Array
        astring_array = array_list.ToArray()

    End Sub
End Class


ArrayList.TrimToSize

  

Imports System
Imports System.Collections
Public Class MainClass
   Public Shared Sub Main()
      Dim arrayList As arrayList = New arrayList(1)
      arrayList.Add("a")
      try
          Console.WriteLine(arrayList(0))
      Catch outOfRange As ArgumentOutOfRangeException
          Console.WriteLine(outOfRange.ToString())
      End Try
      Console.WriteLine(arrayList.Count)
      Console.WriteLine(arrayList.Contains("a"))
      
      Console.WriteLine(arrayList.IndexOf("a"))
      arrayList.Remove("a")
      arrayList.TrimToSize()
      Console.WriteLine(arrayList.Capacity)
      arrayList.Add("a")
      Dim enumerator As IEnumerator = arrayList.GetEnumerator()
      While enumerator.MoveNext()
         Console.WriteLine(enumerator.Current )
      End While 
   End Sub
End Class
Источник — «http://vbex.ru/index.php?title=VB.Net_by_API/System.Collections/ArrayList&oldid=2548»