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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writealltext below:

File.WriteAllText Method (System.IO) | Microsoft Learn

Source:

File.cs

Source:

File.cs

Source:

File.cs

Source:

File.cs

Creates 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 truncated and overwritten.

public:
 static void WriteAllText(System::String ^ path, System::String ^ contents, System::Text::Encoding ^ encoding);

public static void WriteAllText(string path, string contents, System.Text.Encoding encoding);

public static void WriteAllText(string path, string? contents, System.Text.Encoding encoding);

static member WriteAllText : string * string * System.Text.Encoding -> unit

Public Shared Sub WriteAllText (path As String, contents As String, encoding As Encoding)

path

String

The file to write to.

contents

String

The string to write to the file.

encoding

Encoding

The encoding to apply to the string.

.NET Framework and .NET Core versions older than 2.1: path is a zero-length string, contains only white space, or contains one or more invalid characters. You can query for invalid characters by using the GetInvalidPathChars() method.

The specified path, file name, or both exceed the system-defined maximum length.

The specified path is invalid (for example, it is on an unmapped drive).

An I/O error occurred while opening the file.

path specified a file that is read-only.

-or-

path specified a file that is hidden.

-or-

This operation is not supported on the current platform.

-or-

path specified a directory.

-or-

The caller does not have the required permission.

path is in an invalid format.

The caller does not have the required permission.

The following code example demonstrates the use of the WriteAllText method to write text to a file. In this example a file is created, if it doesn't already exist, and text is added to it.

using System;
using System.IO;
using System.Text;

class Test
{
    public static void Main()
    {
        string path = @"c:\temp\MyTest.txt";

        // This text is added only once to the file.
        if (!File.Exists(path))
        {
            // Create a file to write to.
            string createText = "Hello and Welcome" + Environment.NewLine;
            File.WriteAllText(path, createText, Encoding.UTF8);
        }

        // This text is always added, making the file longer over time
        // if it is not deleted.
        string appendText = "This is extra text" + Environment.NewLine;
        File.AppendAllText(path, appendText, Encoding.UTF8);

        // Open the file to read from.
        string readText = File.ReadAllText(path);
        Console.WriteLine(readText);
    }
}

open System
open System.IO
open System.Text

let path = @"c:\temp\MyTest.txt"

// This text is added only once to the file.
if File.Exists path |> not then
    // Create a file to write to.
    let createText =
        "Hello and Welcome" + Environment.NewLine

    File.WriteAllText(path, createText, Encoding.UTF8)

// This text is always added, making the file longer over time
// if it is not deleted.
let appendText =
    "This is extra text" + Environment.NewLine

File.AppendAllText(path, appendText, Encoding.UTF8)

// Open the file to read from.
let readText = File.ReadAllText path
printfn $"{readText}"

Imports System.IO
Imports System.Text

Public Class Test
    Public Shared Sub Main()
        Dim path As String = "c:\temp\MyTest.txt"
        Dim sw As StreamWriter

        ' This text is added only once to the file.
        If File.Exists(path) = False Then

            ' Create a file to write to.
            Dim createText As String = "Hello and Welcome" + Environment.NewLine
            File.WriteAllText(path, createText, Encoding.UTF8)
        End If

        ' This text is always added, making the file longer over time
        ' if it is not deleted.
        Dim appendText As String = "This is extra text" + Environment.NewLine
        File.AppendAllText(path, appendText, Encoding.UTF8)

        ' Open the file to read from.
        Dim readText As String = File.ReadAllText(path)
        Console.WriteLine(readText)
    End Sub
End Class

Given a string and a file path, this method opens the specified file, writes the string to the file using the specified encoding, and then closes the file. The file handle is guaranteed to be closed by this method, even if exceptions are raised.

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