File.ReadAllText(String, Encoding) Method in C# with Examples - GeeksforGeeks

09 Mar, 2021
File.ReadAllText(String, Encoding) is an inbuilt File class method that is used to open a text file then reads all the text in the file with the specified encoding and then closes the file.Syntax:  
public static string ReadAllText (string path, System.Text.Encoding encoding);
Parameter: This function accepts a parameter which is illustrated below: 
path: This is the specified file to open for reading.
encoding: This is applied to the contents of the file.
Exceptions: 
ArgumentException: The path is a zero-length string, contains only white space, or one or more invalid characters as defined by InvalidPathChars.
ArgumentNullException: The path is null.
PathTooLongException: The specified path, file name, or both exceed the system-defined maximum length.
DirectoryNotFoundException: The specified path is invalid.
IOException: An I/O error occurred while opening the file.
UnauthorizedAccessException: The path specified a file that is read-only. OR this operation is not supported on the current platform. OR the path specified a directory. OR the caller does not have the required permission.
FileNotFoundException: The file specified in the path was not found.
NotSupportedException: The path is in an invalid format.
SecurityException: The caller does not have the required permission.
Return Value: Returns a string containing all the text in the file.Below are the programs to illustrate the File.ReadAllText(String, Encoding) method.Program 1: Initially, a file file.txt is created with some contents shown below- 
 
C#
// C# program to illustrate the usage// of File.ReadAllText(String, Encoding) method  // Using System, System.IO and// System.Text namespacesusing System;using System.IO;using System.Text;  class GFG {    public static void Main()    {        // Specifying a file        string path = @"file.txt";          // Calling the ReadAllText(String, Encoding)        // function        string readText = File.ReadAllText(path, Encoding.UTF8);          // Printing the file contents        Console.WriteLine(readText);    }}
Output:  
GFG
gfg
Geeks
GeeksforGeeks
geeksforgeeks
Program 2: Initially, no file was created. Below code itself create a file file.txt with some specified contents. 
C#
// C# program to illustrate the usage// of File.ReadAllText(String, Encoding) method  // Using System, System.IO and// System.Text namespacesusing System;using System.IO;using System.Text;  class GFG {    public static void Main()    {        // Specifying a file        string path = @"file.txt";          // Adding below contents to the file        string[] createText = { "GFG", "is a", "CS", "portal" };        File.WriteAllLines(path, createText, Encoding.UTF8);          // Calling the ReadAllText() function        string readText = File.ReadAllText(path, Encoding.UTF8);          // Printing the file contents        Console.WriteLine(readText);    }}
Output:  
GFG
is a
CS
portal
arorakashish0911
CSharp-File-Handling
C#
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