C# Binary File Read Random Example | Binary File Read Random | Source Code

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C# Binary File Read Random Example | Binary File Read Random | Source Code

Purpose: – Illustrates the C# Syntax for Random Read of Binary File.

 C# | 
 copy code |
?
 
using System;
using System.IO;
using Microsoft.VisualBasic;
 
// This example is from http://IdealProgrammer.com
 
public class clsBinaryFileReadRandom
{
 
 
 
 
	public  void Main()
	{
		Product prod = new Product();
 
		//Find next available file number
		int file_num = Microsoft.VisualBasic.FileSystem.FreeFile();
 
		//Open file in random mode so we can write the records 
		Microsoft.VisualBasic.FileSystem.FileOpen(file_num, "Products.DAT", Microsoft.VisualBasic.OpenMode.Random, Microsoft.VisualBasic.OpenAccess.ReadWrite, Microsoft.VisualBasic.OpenShare.Shared, Microsoft.VisualBasic.Strings.Len(prod));
 
		//Write the records
		try
		{
			Microsoft.VisualBasic.FileSystem.FilePut(file_num, new Product(1, "My Little Red Reader", "Book"), -1);
			Microsoft.VisualBasic.FileSystem.FilePut(file_num, new Product(2, "2001", "Video"), -1);
			Microsoft.VisualBasic.FileSystem.FilePut(file_num, new Product(3, "Dell Laptop", "Computer"), -1);
			Microsoft.VisualBasic.FileSystem.FilePut(file_num, new Product(4, "Toyota", "Car"), -1);
			Microsoft.VisualBasic.FileSystem.FilePut(file_num, new Product(5, "Cat", "Pet"), -1);
			Microsoft.VisualBasic.FileSystem.FilePut(file_num, new Product(6, "Carrots", "Food"), -1);
 
		}
		catch (FileNotFoundException fileException)
		{
			Console.WriteLine("File Does Not Exits");
		}
		catch (FormatException formattingException)
		{
			Console.WriteLine("Invalid Format");
 
 
		}
 
 
		//Read the records
		ValueType myProd = (ValueType)prod;
		for (var i = 6; i >= 1; i -= 2)
		{
			Microsoft.VisualBasic.FileSystem.FileGet(file_num, ref myProd, i);
			prod = (Product)myProd;
			Console.WriteLine(prod.ToString());
		}
 
		// Close the file.
		try
		{
			Microsoft.VisualBasic.FileSystem.FileClose(file_num);
		}
		catch (IOException e)
		{
			Console.WriteLine("Cannot close file");
		}
 
 
		//pause the console window
		Console.ReadLine();
	}
}
 
public struct Product
{
	public int ID;
	[VBFixedString(25)]
	public string ProductName;
	[VBFixedString(25)]
	public string ProductType;
 
	public Product(int new_id, string product_name, string product_type) : this()
	{
		ID = new_id;
		ProductName = product_name;
		ProductType = product_type;
	}
 
	public override string ToString()
	{
		return ID + ": " + ProductName + " " + ProductType;
	}
}

 C# | 
 copy code |
?
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace CSharp_Syntax
{
    class Program
    {
        static void Main(string[] args)
        {
 
 
            clsBinaryFileReadRandom myBinaryFileReadRandom = new clsBinaryFileReadRandom();
            myBinaryFileReadRandom.Main();
 
        }
    }
}
 
 
 

1. Install C# (Express or Standard Edition)
2. Install SQL Server Express
3. Download Northwind and pubs Database
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 a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Module1.vb

Instructions:

1. Use C# 2010 Express or Standard Edition
2. Create new project;
   • Click File/New Project
   • Select Console Application Template
   • Select C# for Language
   • name of project could be CSharp_Syntax.



3. Add New folder named "FileDirectory"
   • Right-click project name in solution explorer;
   • add new folder;
   • name of folder could be: FileDirectory
4. Add Class Named clsBinaryFileReadRandom to FileDirectory folder
   • Right-click FileDirectory folder;
   • add new item;
   • Select class
   • Class name could be clsBinaryFileReadRandom
5. Click on C# in code in step 1 at top of page to copy code into clsBinaryFileReadRandom.cs
6. Click on C# in step 2 at top of page to copy code into Program.cs
7. Click green arrow or press F5 to run program

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