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C# File.ReadAllBytes, Get Byte Array From File
Call the File.ReadAllBytes method in System.IO to get a byte array from a file.File.ReadAllBytes returns a byte array. It is simple to call—it receives a filename and returns the file data. It can be combined with other types to create high performance file formats.Byte ArrayFile
Example. We see the syntax for calling File.ReadAllBytes. The method returns a byte array, which will be stored in the large object heap if it is large. The array can of course be used as any other byte[] type. We get a byte array from a file.
C# program that uses File.ReadAllBytes method
using System;
using System.IO;
class Program
{
static void Main()
{
byte[] array = File.ReadAllBytes("C:\\a");
Console.WriteLine("First byte: {0}", array[0]);
Console.WriteLine("Last byte: {0}",
array[array.Length - 1]);
Console.WriteLine(array.Length);
}
}
Output
First byte: 29
Last byte: 0
5407219
Internals. ReadAllBytes is implemented in an obvious way. It uses the using-statement on a FileStream. Then it loops through the file and puts the bytes into an array. In .NET 4.0, it throws an exception if the file exceeds 2 gigabytes.UsingException
Discussion. You can do amazing things with File.ReadAllBytes. After using File.ReadAllBytes, you can use MemoryStream and BinaryReader to read in a binary file you had previously generated with BinaryWriter. This yields fast file formats.MemoryStreamBinaryReaderBinaryWriter
Notes, memory. File.ReadAllBytes can be used to reduce memory usage. If you have a binary file that contains thousands of sub-resources, you can load the whole file into memory with File.ReadAllBytes as a byte array.
Then: Use BinaryReader to index the contents of the file. Whenever a resource is required, just access the byte range from the byte array.
Note: This can collapse thousands of objects into a single object on the large object heap.
ObjectSummary. ReadAllBytes loads a binary file into memory. It has a simple calling pattern and is implemented in a straightforward and efficient way. By combining it with other types, you can develop efficient in-memory database systems.
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- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression