ArrayList.BinarySearch (Object, IComparer)

 

Imports System
Imports System.Collections

Public Class SimpleStringComparer
    Implements IComparer

    Function Compare(x As Object, y As Object) As Integer Implements IComparer.Compare
          Dim cmpstr As String = CType(x, String)
          Return cmpstr.CompareTo(CType(y, String))
    End Function
End Class

Public Class MyArrayList
    Inherits ArrayList
    Public Shared Sub Main()
        Dim coloredAnimals As New MyArrayList()
        coloredAnimals.Add("A")
        coloredAnimals.Add("B")
        coloredAnimals.Add("C")
        coloredAnimals.Add("D")
        coloredAnimals.Add("E")
        coloredAnimals.Add("F")
        coloredAnimals.Add("G")

        coloredAnimals.Sort()

        Dim index As Integer = coloredAnimals.IterativeSearch("A")
        Console.WriteLine("Iterative search, item found at index: {0}", index)

        index = coloredAnimals.BinarySearch("A", New SimpleStringComparer())
        Console.WriteLine("Binary search, item found at index:    {0}", index)
    End Sub

    Public Function IterativeSearch(finditem As Object) As Integer
        Dim index As Integer = -1

        For i As Integer = 0 To MyClass.Count - 1
            If finditem.Equals(MyClass.Item(i))
                index = i
                Exit For
            End If
        Next i
        Return index
    End Function
End Class
'

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5.	Store different Class in an ArrayList
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7.	ArrayList Class Implements the IList interface
8.	Adds an object to the end of the ArrayList.
9.	ArrayList.BinarySearch Searches the entire sorted ArrayList for an element using the default comparer
10.	ArrayList.Clear removes all elements from the ArrayList.
11.	ArrayList.CopyTo copies the entire ArrayList to a compatible one-dimensional Array, starting at the beginning of the target array.
12.	ArrayList.FixedSize returns an ArrayList wrapper with a fixed size.
13.	ArrayList.GetEnumerator returns an enumerator for a range of elements in the ArrayList.
14.	ArrayList.GetRange returns an ArrayList which represents a subset of the elements in the source ArrayList.
15.	ArrayList.IndexOf searches for the specified Object and returns the zero-based index
16.	ArrayList.Insert inserts an element into the ArrayList at the specified index.
17.	ArrayList.IsReadOnly Property tells whether the ArrayList is read-only.
18.	ArrayList.IsSynchronized Property tells whether access to the ArrayList is synchronized (thread safe).
19.	ArrayList.Item Property gets or sets the element at the specified index.
20.	ArrayList.LastIndexOf searches for Object and returns the zero-based index of the last occurrence
21.	ArrayList.Remove removes the first occurrence of a specific object from the ArrayList.
22.	ArrayList.Repeat Method returns an ArrayList whose elements are copies of the specified value.
23.	Reverses the order of the elements in the entire ArrayList.
24.	Sorts the elements in the ArrayList using the specified comparer.
25.	Sorts the elements in a range in ArrayList using the specified comparer.
26.	Sorts the elements in the entire ArrayList.
27.	Copies the elements of the ArrayList to a new array of the specified element type.
28.	Reverses the order of the elements in a range.

ArrayList.BinarySearch (Object, IComparer) : ArrayList « Data Structure « VB.Net

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