C# StringBuilder Source Code Example

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StringBuilder Source Code Example

Purpose: – Illustrates using StringBuilder and StringBuilder Methods in C-Sharp.

Prerequistes:

1. Install C# (Express or Standard Edition)
2. Install SQL Server Express
3. Download Northwind and Pubs Databases
4. Attach Northwind Database to Databases in Sql Express
5. Attach pubs Database to Databases in Sql Express

Notes:

• Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
• You can build your own library of syntax examples by using same project over and over and just adding new classes to it.

Instructions:

1. Use C# 2008 (express or standard)
2. Create new project;
   • Click File/New Project
   • Select Console Application Template
   • Select C-Sharp for Language
   • name of project could be CSharp_Syntax.
3. Add New folder named "LanguageBasics"
   • Right-click project name in solution explorer;
   • add new folder;
   • name of folder could be: LanguageBasics
4. Add Class named clsStringBuilder to LanguageBasics folder
   • Right-click LanguageBasics folder;
   • add new item;
   • Select Class
   • Class name could be clsStringBuilder
5. Click on copy code in code below to copy code into class clsStringBuilder.cs
6. Click on copy code in second set of code below to copy code into Program.cs
7. Click on green arrow in toolbar in VS or press F5 to run program.

Step 1: Click on Copy Code to Cut-n-paste code into clsStringBuilder.cs

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