c# generate barcode from string Queue Properties in C#.NET

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Queue Properties
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Name Count
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Table 4-10
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Description Gets the number of items in the queue
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Queue Methods
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Name Dequeue Enqueue Peek
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Description Retrieves an item from the front of the queue, removing it at the same time Adds an item to the end of the queue Retrieves the first item from the queue without actually removing it
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Working with the Queue class is very straightforward. Once you have an instance of the class, you can use the Enqueue method to add items to the queue and the Dequeue method to remove items from the list, as demonstrated in this short example:
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' VB Dim q As New Queue() q.Enqueue("An item") Console.WriteLine(q.Dequeue()) // C# Queue q = new Queue(); q.Enqueue("An item"); Console.WriteLine(q.Dequeue());
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The Queue class allows you to add duplicates items and null values, so you cannot test the result of the Dequeue or Peek method to see whether the Queue is empty. To do that, you can check the Count property to see whether the collection is empty. For example, if you add items to the Queue and want to remove them and show them in the console, you could write code like the following:
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' VB Dim q As New Queue() q.Enqueue("First") q.Enqueue("Second") q.Enqueue("Third") q.Enqueue("Fourth") While q.Count > 0 Console.WriteLine(q.Dequeue()) End While
Lesson 2: Working with Sequential Lists
// C# Queue q = new Queue(); q.Enqueue("First"); q.Enqueue("Second"); q.Enqueue("Third"); q.Enqueue("Fourth"); while (q.Count > 0) { Console.WriteLine(q.Dequeue()); }
Because the Queue is a FIFO collection, the preceding example will produce the following display order in the console window:
First Second Third Fourth
There are times when being able to look at the next item without actually removing it is a good idea. Imagine if you had some code that could work with certain types of objects. If you were to Dequeue it and then find out that someone else had to handle it, you could put it back into the queue, but it would lose its place in line. That is where the Peek method comes in, as shown in this example:
' VB If TypeOf q.Peek() Is String Then Console.WriteLine(q.Dequeue()) End If // C# if (q.Peek() is String) { Console.WriteLine(q.Dequeue()); }
At times, the type of sequential collection you need is not first-in, first-out, but last-in, first-out. That is where the Stack class comes in.
The Stack Class
In contrast to the Queue class, the Stack class is a last-in, first-out (LIFO) collection. The interface to the Stack class is also very simple: it supports pushing items into the stack and popping them out. As you can probably guess from its name, the Stack class most closely exemplifies a stack of cards. As you add cards to the stack, you can pull a card off the top but not dig
4
Collections and Generics
down into the stack to get a card. The most important properties and methods of the Stack class are shown in Table 4-11 and Table 4-12, respectively.
Table 4-11 Stack Properties
Name Count
Table 4-12
Description Gets the number of items in the stack
Stack Methods
Name Pop Push Peek
Description Retrieves an item from the top of the stack, removing it at the same time Adds an item to the top of the stack Retrieves the top item from the stack without removing it
Working with the Stack class is similar to working with the Queue class, but instead of enqueuing and dequeuing, you are pushing onto and popping off of the stack. Once you have an instance of the class, you use the Push method to add items to the queue and the Dequeue method to remove items from the list, as shown in this short example:
' VB Dim s as new Stack() s.Push("An item") Console.WriteLine(s.Pop()) // C# Stack s = new Stack(); s.Push("An item"); Console.WriteLine(s.Pop());
As with the Queue class, you can add duplicates and null values, so you cannot test the result of the Pop or Peek method to see whether the Stack is empty. For example, if you add items to the Stack and want to remove them and show them in the console, you could write code like the following:
' VB Dim s As New Stack() s.Push("First") s.Push("Second") s.Push("Third") s.Push("Fourth")
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