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C# StringBuilder Source Code Example

Description: Illustrates using StringBuilder and StringBuilder Methods in C-Sharp.

Example Class Main:

using System.Text;
using System;
 
public class clsStringBuilder
{
 
    public void Main()
    {
 
        //****************************************************************************************
        // Example #1: StringBuilder Append(string) - most common way stringbuilder is used
        // Adds the specified string or string representation of the specified value to the end 
        // of the string
        //****************************************************************************************
 
        Console.WriteLine("Example #1: Simple StringBuilder Append(string) ");
        StringBuilder sb = new StringBuilder();
        sb.Append("First Line");
        sb.Append("\n");
        sb.Append("Second Line");
 
        Console.WriteLine(sb.ToString());
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //Append(string, startIndex, count)
        //****************************************************************************************
        // Example #2: StringBuilder Append(string, startIndex, count) 
        // Adds a substring of the specified string, starting with the specified
        // position and having the specified length, to the end of the string
        //****************************************************************************************
 
        Console.WriteLine("Example #2: StringBuilder Append(string, startIndex, count)");
        StringBuilder sb2 = new StringBuilder();
        sb2.Append("The dog and cat ");
        sb2.Append("love to fight and play", 0, 13);
        //take love to fight and add to end of prev string
        Console.WriteLine(sb2.ToString());
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //Insert(index, string[, count])
        //****************************************************************************************
        // Example #3: StringBuilder Insert(index, string[, count]) 
        // Inserts the specified string or a string representation of the specified
        // value at the specified position in the string the specified number of 
        // times. If the count is ommitted, a single copy of the string is inserted.
        //****************************************************************************************
 
        Console.WriteLine("Example #3: Insert(index, string[, count])");
        StringBuilder sb3 = new StringBuilder();
 
        sb3.Append("This is the initial sentence");
        sb3.Insert(20, "and modified ", 2);
        Console.WriteLine(sb3.ToString());
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //Remove(startIndex,count)
        //****************************************************************************************
        // Example #4: StringBuilder Remove(startIndex,count) 
        // Removes the specified number of characters from the string starting at
        // the specified position
        //****************************************************************************************
 
        Console.WriteLine("Example #4: StringBuilder Remove(startIndex,count)");
        StringBuilder sb4 = new StringBuilder();
 
        sb4.Append("This is the initial sentence");
        sb4.Remove(20, 8);
        Console.WriteLine(sb4.ToString());
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //Replace(oldString,newString [,startIndex][,count])
        //****************************************************************************************
        // Example #5: StringBuilder Replace(oldString,newString [,startIndex][,count])
        // Replaces all occurences of the old string with the new string starting
        // at the specified position and continuing for the specified number of characters.
        // If you omit startIndex, it starts at beginning
        // If you omit count, it does entire string
        //****************************************************************************************
 
        Console.WriteLine("Example #5: StringBuilder Replace(oldString,newString [,startIndex][,count])");
        StringBuilder sb5 = new StringBuilder();
 
        sb5.Append("This is the initial sentence");
        sb5.Replace("initial", "new");
        Console.WriteLine(sb5.ToString());
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
 
 
 
 
 
 
        //Prevent console from closing before you press enter
        Console.ReadLine();
 
    }
 
 
}

Example Class Program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace CSharp_Syntax
{
    class Program
    {
        static void Main(string[] args)
        {
            //LanguageBasics
 
 
            clsStringBuilder myStringBuilder = new clsStringBuilder();
            myStringBuilder.Main();
 
 
        }
    }
}