Reader Level:
Articles

StringBuilder Class in C#

By Puran Mehra on July 17, 2009
In this article I will explain about StringBuilder Class in C#.
  • 0
  • 0
  • 29471

Most of the programmer use string, as they are easy to use and provides effective interaction with the user. Every time we manipulate a string object we get a new string object created.

String is immutable means that once it has been created, a string cannot be changed. No characters can be added or removed from it, nor can its length be changed.

The String object is immutable while StringBuilder object is mutable. Both String and StringBuilder are reference type. But String acts like a value type.

S
tringBuilder is located in the System.Text namespace.

The System.Text.StringBuilder class can be used when you want to modify a string without creating a new object. Using the StringBuilder class can boost performance when concatenating many strings together in a loop.

The following table lists the methods you can use to modify the contents of a StringBuilder.

Method

Description

StringBuilder.Append

Appends information to the end of the current StringBuilder.

StringBuilder.AppendFormat

Replaces a format specifier passed in a string with formatted text.

StringBuilder.Insert

Inserts a string or object into the specified index of the current StringBuilder.

StringBuilder.Remove

Removes a specified number of characters from the current StringBuilder.

StringBuilder.Replace

Replaces a specified character at a specified index.

Program to explain StringBuilder Class

using
System;
using System.Text;
namespace StringBuilder_example
{
    class Program
    {
        static void Main(string[] args)
        {
            StringBuilder sbstr = new StringBuilder("We are the world");
            Console.WriteLine(sbstr);           

            sbstr.Append(" we are the people");
            Console.WriteLine(sbstr);

            float currency=3400.50f;
            sbstr.AppendFormat(" Our individual salary : {0:C}. ", currency);
            Console.WriteLine(sbstr);

            sbstr.Insert(11, "people of ");
            Console.WriteLine(sbstr);

            sbstr.Remove(11, 10);
            Console.WriteLine(sbstr);

            sbstr.Replace("world", "Indian");
            Console.WriteLine(sbstr);

            Console.ReadKey();
        }
    }
}

Output of above program

stringbuilder_output.gif

Difference between String and StringBuilder class

String

StringBuilder

System.String is immutable

System.StringBuilder is mutable

Concatenation is used to combine two strings

Append method is used.

The first string is combined to the other string by creating a new copy in the memory as a string object, and then the old string is deleted

Insertion is done on the existing string.

String is efficient for small string manipulation

StringBuilder is more efficient in case large amounts of string manipulations have to be performed

Conclusion

I hope that this article would have helped you in understanding StringBuilder Class in C#. StringBuilder can improve the performance of your application.

Your feedback and constructive contributions are welcome. Please feel free to contact me for feedback or comments you may have about this article.

Puran Mehra

Working as a Software professional. 

COMMENT USING

Trending up