Windows Database Applications CIS 341 Chapter 11.

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Presentation transcript:

Windows Database Applications CIS 341 Chapter 11

Objectives Declare and reference collections Collection types Data Structures Object collection Items collection of a list box

Referencing Collection Items DsStoreSales1.Tables(“Stores”) DsStoreSales1.Tables(0)

Collection Class ArrayListContains, Insert, RemoveAt, and Sort BitArrayBoolean values CollectionBaseUsed for inheritance DictionaryBaseUsed for inheritance HashtableAdd, Remove QueueEnqueue, Dequeue, Peek SortedListAdd, Remove, and RemoveAt StackPush, Pop, Peek

Stacks mstkList.Push(strItem) strItem = mstkList.Peek() mstkList.Pop()

Queue mqueList.Enqueue(strItem) strItem = mqueList.Peek() mqueList.Dequeue()

Hash Tables Strkey = strItem.GetHashCode.ToString() mhshTable.Add(strKey, strItem) strItem = lstLanguages.SelectedItem.ToString() strKey = strItem.GetHashCode mhshTable.Remove(strKey) For Each strItem In mhshTable.Values lstLanguages.Items.Add(strItem) Next

Sorted List strKey = strItem.Substring(0,3) msrtList.Add(strKey, strItem) lstLanguages.Items.Clear() For each strItem in msrtList.Values lstLanguages.Items.Add(strItem) Next

Collection of Objects Dim objStudent As New Student(txtName.Text, CDec(txtGPA.Text)) mcolStudents.Add(strKey, objStudent) objStudent = CType(mcolStudents.Item(strKey), Student)