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C# Path.GetRandomFileName Method
Use the Path.GetRandomFileName method from System.IO to get path names.Path.GetRandomFileName generates random file names. We can use these to store data in a secret (or unique) way. The filename does not conflict with other files. It will not be corrupted by other programs.Path
Example. First, there are many different ways of generating random strings and file names in the C# language. You could develop a method that populates a char array using the Random class, and then returns a string based on those numbers.
However: The .NET Framework offers the excellent Path.GetRandomFileName static parameterless method, which returns appropriate strings.
StaticWriteRandomFile: This method internally gets a random file name, gets the correct output path on the C:\ volume, and then writes some text to it.
Returns: The Path.GetRandomFileName method returns a random file name with an extension. This includes the period before the extension.
ReturnTip: The extension will be 1 dot and 3 letters, while the name will be 8 characters. All the characters are valid file name characters.
C# program that writes random file names
using System;
using System.IO;
class Program
{
static void Main()
{
//
// Write three random files.
//
WriteRandomFile();
WriteRandomFile();
WriteRandomFile();
}
static void WriteRandomFile()
{
//
// Get random file name.
//
string fileName = Path.GetRandomFileName();
//
// Construct full path.
//
string outputPath = Path.Combine("C:\\", fileName);
//
// Write to screen and disk.
//
Console.WriteLine(fileName);
File.WriteAllText(outputPath, "Random");
}
}
Output
m4adstid.dw2
mbhbtcen.5m1
1qtk3r5u.bka
Internally, the Path.GetRandomFileName method gets random bytes from the cyptographic-quality random number generator RNGCryptoServiceProvider. Next, it uses bitwise ANDs to fill a StringBuilder with characters based on those bytes.RNGCryptoServiceProvider
The ToBase32String method uses a StringBuilder to generate the file name. When that method returns, the StringBuilder is converted to a string. In the calling method, the string is converted to a char array.
Finally: The char array is converted to a string. This method could probably be significantly optimized.
Summary. We generated random file names to store certain kinds of data. By using Path.GetRandomFileName, you can write to files that have cryptographically-secure random names. This can enhance security or simplicity in your programs.
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- C# StartsWith and EndsWith String Methods
- C# Static Array
- C# Static Dictionary
- C# Stopwatch Examples
- C# Stream
- C# StreamReader ReadToEnd Example (Read Entire File)
- C# StreamReader ReadToEndAsync Example (Performance)
- C# StreamReader Examples
- C# StreamWriter Examples
- 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