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Stack with Examples in C#
The Stack class in C# represents a simple last-in-first-out (LIFO) non-generic collection of objects.
Following are the properties of the Stack class −
| Sr.No | Property & Description |
|---|---|
| 1 | Count Gets the number of elements contained in the Stack. |
| 2 | IsSynchronized Gets a value indicating whether access to the Stack is synchronized (thread safe). |
| 3 | SyncRoot Gets an object that can be used to synchronize access to the Stack. |
Following are some of the methods of the Stack class −
| Sr.No | Property & Description |
|---|---|
| 1 | Clear() Removes all objects from the Stack. |
| 2 | Clone() Creates a shallow copy of the Stack. |
| 3 | Contains(Object) whether an element is in the Stack. |
| 4 | CopyTo(Array, Int32) Copies the Stack to an existing one-dimensional Array, starting at the specified array index. |
| 5 | Equals(Object) Determines whether the specified object is equal to the current object. |
| 6 | GetEnumerator() Returns an IEnumerator for the Stack. |
| 7 | GetHashCode() Serves as the default hash function. (Inherited from Object) |
| 8 | GetType() Gets the Type of the current instance. |
| 9 | Peek() Returns the object at the top of the Stack without removing it. |
| 10 | Pop() Removes and returns the object at the top of the Stack |
| 11 | Push(Object) Inserts an object at the top of the Stack. |
Example
Let us now see some of the examples −
To get object at the top of the Stack, the code is as follows −
using System;
using System.Collections.Generic;
public class Demo {
public static void Main() {
Stack<string> stack = new Stack<string>();
stack.Push("A");
stack.Push("B");
stack.Push("C");
stack.Push("D");
stack.Push("E");
stack.Push("F");
stack.Push("G");
stack.Push("H");
stack.Push("I");
stack.Push("J");
Console.WriteLine("Count of elements = "+stack.Count);
Console.WriteLine("Element at the top of stack = " + stack.Peek());
}
}Output
This will produce the following output −
Count of elements = 10 Element at the top of stack = J Count of elements = 10
To check if a Stack has an elements, use the C# Contains() method. Following is the code −
Example
using System;
using System.Collections.Generic;
public class Demo {
public static void Main() {
Stack<int> stack = new Stack<int>();
stack.Push(100);
stack.Push(150);
stack.Push(175);
stack.Push(200);
stack.Push(225);
stack.Push(250);
stack.Push(300);
stack.Push(400);
stack.Push(450);
stack.Push(500);
Console.WriteLine("Elements in the Stack:");
foreach(var val in stack) {
Console.WriteLine(val);
}
Console.WriteLine("Count of elements in the Stack = "+stack.Count);
Console.WriteLine("Does Stack has the element 400?= "+stack.Contains(400));
}
}Output
This will produce the following output −
Elements in the Stack: 500 450 400 300 250 225 200 175 150 100 Count of elements in the Stack = 10 Does Stack has the element40400?= False
Updated on: 11-Dec-2019
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