Imports System
Imports System.Collections
Imports System.Collections.Specialized
Public Class SamplesStringCollection
Public Shared Sub Main()
' Create and initializes a new StringCollection.
Dim myCol As New StringCollection()
' Add a range of elements from an array to the end of the StringCollection.
Dim myArr() As String = {"RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED"}
myCol.AddRange(myArr)
' Display the contents of the collection using foreach. This is the preferred method.
Console.WriteLine("Displays the elements using foreach:")
PrintValues1(myCol)
' Display the contents of the collection using the enumerator.
Console.WriteLine("Displays the elements using the IEnumerator:")
PrintValues2(myCol)
' Display the contents of the collection using the Count and Item properties.
Console.WriteLine("Displays the elements using the Count and Item properties:")
PrintValues3(myCol)
' Add one element to the end of the StringCollection and insert another at index 3.
myCol.Add("* white")
myCol.Insert(3, "* gray")
Console.WriteLine("After adding ""* white"" to the end and inserting ""* gray"" at index 3:")
PrintValues1(myCol)
' Remove one element from the StringCollection.
myCol.Remove("yellow")
Console.WriteLine("After removing ""yellow"":")
PrintValues1(myCol)
' Remove all occurrences of a value from the StringCollection.
Dim i As Integer = myCol.IndexOf("RED")
While i > - 1
myCol.RemoveAt(i)
i = myCol.IndexOf("RED")
End While
' Verify that all occurrences of "RED" are gone.
If myCol.Contains("RED") Then
Console.WriteLine("*** The collection still contains ""RED"".")
End If
Console.WriteLine("After removing all occurrences of ""RED"":")
PrintValues1(myCol)
' Copy the collection to a new array starting at index 0.
Dim myArr2(myCol.Count) As String
myCol.CopyTo(myArr2, 0)
Console.WriteLine("The new array contains:")
For i = 0 To myArr2.Length - 1
Console.WriteLine(" [{0}] {1}", i, myArr2(i))
Next i
Console.WriteLine()
' Clears the entire collection.
myCol.Clear()
Console.WriteLine("After clearing the collection:")
PrintValues1(myCol)
End Sub 'Main
' Uses the foreach statement which hides the complexity of the enumerator.
' NOTE: The foreach statement is the preferred way of enumerating the contents of a collection.
Public Shared Sub PrintValues1(myCol As StringCollection)
Dim obj As [Object]
For Each obj In myCol
Console.WriteLine(" {0}", obj)
Next obj
Console.WriteLine()
End Sub 'PrintValues1
' Uses the enumerator.
' NOTE: The foreach statement is the preferred way of enumerating the contents of a collection.
Public Shared Sub PrintValues2(myCol As StringCollection)
Dim myEnumerator As StringEnumerator = myCol.GetEnumerator()
While myEnumerator.MoveNext()
Console.WriteLine(" {0}", myEnumerator.Current)
End While
Console.WriteLine()
End Sub 'PrintValues2
' Uses the Count and Item properties.
Public Shared Sub PrintValues3(myCol As StringCollection)
Dim i As Integer
For i = 0 To myCol.Count - 1
Console.WriteLine(" {0}", myCol(i))
Next i
Console.WriteLine()
End Sub 'PrintValues3
End Class 'SamplesStringCollection
'This code produces the following output.
'
'Displays the elements using foreach:
' RED
' orange
' yellow
' RED
' green
' blue
' RED
' indigo
' violet
' RED
'
'Displays the elements using the IEnumerator:
' RED
' orange
' yellow
' RED
' green
' blue
' RED
' indigo
' violet
' RED
'
'Displays the elements using the Count and Item properties:
' RED
' orange
' yellow
' RED
' green
' blue
' RED
' indigo
' violet
' RED
'
'After adding "* white" to the end and inserting "* gray" at index 3:
' RED
' orange
' yellow
' * gray
' RED
' green
' blue
' RED
' indigo
' violet
' RED
' * white
'
'After removing "yellow":
' RED
' orange
' * gray
' RED
' green
' blue
' RED
' indigo
' violet
' RED
' * white
'
'After removing all occurrences of "RED":
' orange
' * gray
' green
' blue
' indigo
' violet
' * white
'
'The new array contains:
' [0] orange
' [1] * gray
' [2] green
' [3] blue
' [4] indigo
' [5] violet
' [6] * white
'
'After clearing the collection:
'