File.WriteAllText(String, String, Encoding) Method in C# with Examples
Last Updated :
01 Jun, 2020
File.WriteAllText(String, String, Encoding) is an inbuilt File class method that is used to create a new file, writes the specified string to the file using the specified encoding, and then closes the file. If the target file already exists, it is overwritten.
Syntax:
public static void WriteAllText (string path, string contents, System.Text.Encoding encoding);
Parameter: This function accepts three parameters which are illustrated below:
- path: This is the specified file where specified string are going to be written.
- contents: This is the specified string to write to the file.
- encoding: This is the specified encoding to apply to the string.
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 the path specified a file that is hidden. 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.
- NotSupportedException: The path is in an invalid format.
- SecurityException: The caller does not have the required permission.
Below are the programs to illustrate the File.WriteAllText(String, String) method.
Program 1: Initially, no file was created. Below code itself create a file
file.txt and write the specified string array into the file.
CSharp
// C# program to illustrate the usage
// of File.WriteAllText(String, String,
// Encoding) method
// Using System, System.IO and
// System.Text namespaces
using System;
using System.IO;
using System.Text;
class GFG {
public static void Main()
{
// Specifying a file
string path = @"file.txt";
// Creating a string
string createText = "GeeksforGeeks" + Environment.NewLine;
// Writing the string to the file
File.WriteAllText(path, createText, Encoding.UTF8);
// Reading the contents of the file
string readText = File.ReadAllText(path, Encoding.UTF8);
Console.WriteLine(readText);
}
}
GeeksforGeeks
After running the above code, the above output is shown, and a new file
file.txt is created shown below-
Program 2: Initially, a file
file.txt is created with some contents shown below-
Below code overwrites the file contents with the specified string.
CSharp
// C# program to illustrate the usage
// of File.WriteAllText(String, String,
// Encoding) method
// Using System, System.IO and
// System.Text namespaces
using System;
using System.IO;
using System.Text;
class GFG {
public static void Main()
{
// Specifying a file
string path = @"file.txt";
// Creating a string
string createText = "GFG is a cs portal." + Environment.NewLine;
// Overwriting the string to the file
File.WriteAllText(path, createText, Encoding.UTF8);
// Reading the contents of the file
string readText = File.ReadAllText(path, Encoding.UTF8);
Console.WriteLine(readText);
}
}
GFG is a cs portal.
After running the above code, the above output is shown, and the file
file.txt contents became like shown below:
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