File.WriteAllLines Método

Source:

File.cs

Source:

File.cs

Source:

File.cs

public:
 static void WriteAllLines(System::String ^ path, cli::array <System::String ^> ^ contents, System::Text::Encoding ^ encoding);

public static void WriteAllLines (string path, string[] contents, System.Text.Encoding encoding);

static member WriteAllLines : string * string[] * System.Text.Encoding -> unit

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

Parámetros

Excepciones

Ejemplos

En el ejemplo de código siguiente se muestra el uso del método WriteAllLines para escribir texto en un archivo. En este ejemplo se crea un archivo, si aún no existe y se agrega texto a él.

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" };
            File.WriteAllLines(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.ReadAllLines(path, Encoding.UTF8);
        foreach (string s in readText)
        {
            Console.WriteLine(s);
        }
    }
}

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" ]
    File.WriteAllLines(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.ReadAllLines(path, Encoding.UTF8)

for s in readText do
    printfn $"{s}"

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"}
            File.WriteAllLines(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.ReadAllLines(path, Encoding.UTF8)
        Dim s As String
        For Each s In readText
            Console.WriteLine(s)
        Next
    End Sub
End Class

Comentarios

Si el archivo de destino ya existe, se trunca y se sobrescribe.

Dado una matriz de cadenas y una ruta de acceso de archivo, este método abre el archivo especificado, escribe la matriz de cadenas en el archivo mediante la codificación especificada y, a continuación, cierra el archivo.

Source:

File.cs

Source:

File.cs

Source:

File.cs

public:
 static void WriteAllLines(System::String ^ path, System::Collections::Generic::IEnumerable<System::String ^> ^ contents, System::Text::Encoding ^ encoding);

public static void WriteAllLines (string path, System.Collections.Generic.IEnumerable<string> contents, System.Text.Encoding encoding);

static member WriteAllLines : string * seq<string> * System.Text.Encoding -> unit

Public Shared Sub WriteAllLines (path As String, contents As IEnumerable(Of String), encoding As Encoding)

Parámetros

Excepciones

Comentarios

Si el archivo de destino ya existe, se trunca y se sobrescribe.

Puede usar este método para crear un archivo que contenga lo siguiente:

• Los resultados de una consulta de LINQ to Objects en las líneas de un archivo, como se obtiene mediante el método ReadLines.

• Contenido de una colección que implementa una IEnumerable<T> de cadenas.

Source:

File.cs

Source:

File.cs

Source:

File.cs

public:
 static void WriteAllLines(System::String ^ path, System::Collections::Generic::IEnumerable<System::String ^> ^ contents);

public static void WriteAllLines (string path, System.Collections.Generic.IEnumerable<string> contents);

static member WriteAllLines : string * seq<string> -> unit

Public Shared Sub WriteAllLines (path As String, contents As IEnumerable(Of String))

Parámetros

Excepciones

Ejemplos

En el ejemplo siguiente se escriben las líneas seleccionadas de un archivo de datos de ejemplo en un archivo.

using System;
using System.IO;
using System.Linq;

class Program
{
    static string dataPath = @"c:\temp\timestamps.txt";

    static void Main(string[] args)
    {
        CreateSampleFile();

        var JulyWeekends = from line in File.ReadLines(dataPath)
                           where (line.StartsWith("Saturday") ||
                           line.StartsWith("Sunday")) &
                           line.Contains("July")
                           select line;

        File.WriteAllLines(@"C:\temp\selectedDays.txt", JulyWeekends);

        var MarchMondays = from line in File.ReadLines(dataPath)
                           where line.StartsWith("Monday") &&
                           line.Contains("March")
                           select line;

        File.AppendAllLines(@"C:\temp\selectedDays.txt", MarchMondays);
    }

    static void CreateSampleFile()
    {
        DateTime TimeStamp = new DateTime(1700, 1, 1);

        using (StreamWriter sw = new StreamWriter(dataPath))
        {
            for (int i = 0; i < 500; i++)
            {
                DateTime TS1 = TimeStamp.AddYears(i);
                DateTime TS2 = TS1.AddMonths(i);
                DateTime TS3 = TS2.AddDays(i);
                sw.WriteLine(TS3.ToLongDateString());
            }
        }
    }
}

open System
open System.IO

let dataPath = @"c:\temp\timestamps.txt"

let createSampleFile () =
    let timeStamp = DateTime(1700, 1, 1)

    use sw = new StreamWriter(dataPath)

    for i = 0 to 499 do
        let ts1 = timeStamp.AddYears i
        let ts2 = ts1.AddMonths i
        let ts3 = ts2.AddDays i
        ts3.ToLongDateString() |> sw.WriteLine

createSampleFile ()

let julyWeekends =
    File.ReadLines dataPath
    |> Seq.filter (fun line ->
        (line.StartsWith "Saturday"
         || line.StartsWith "Sunday")
        && line.Contains "July")

File.WriteAllLines(@"C:\temp\selectedDays.txt", julyWeekends)

let marchMondays =
    File.ReadLines dataPath
    |> Seq.filter (fun line -> line.StartsWith "Monday" && line.Contains "March")

File.AppendAllLines(@"C:\temp\selectedDays.txt", marchMondays)

Imports System.IO
Imports System.Linq

Class Program
    Shared dataPath As String = "c:\temp\timestamps.txt"

    Public Shared Sub Main(ByVal args As String())
        CreateSampleFile()

        Dim JulyWeekends = From line In File.ReadLines(dataPath) _
            Where (line.StartsWith("Saturday") OrElse _
            line.StartsWith("Sunday")) And line.Contains("July") _
            Select line

        File.WriteAllLines("C:\temp\selectedDays.txt", JulyWeekends)

        Dim MarchMondays = From line In File.ReadLines(dataPath) _
            Where line.StartsWith("Monday") AndAlso line.Contains("March") _
            Select line

        File.AppendAllLines("C:\temp\selectedDays.txt", MarchMondays)
    End Sub

    Private Shared Sub CreateSampleFile()
        Dim TimeStamp As New DateTime(1700, 1, 1)

        Using sw As New StreamWriter(dataPath)
            For i As Integer = 0 To 499
                Dim TS1 As DateTime = TimeStamp.AddYears(i)
                Dim TS2 As DateTime = TS1.AddMonths(i)
                Dim TS3 As DateTime = TS2.AddDays(i)

                sw.WriteLine(TS3.ToLongDateString())
            Next
        End Using
    End Sub
End Class

Comentarios

El comportamiento predeterminado del método WriteAllLines(String, IEnumerable<String>) consiste en escribir datos mediante codificación UTF-8 sin una marca de orden de bytes (BOM). Si es necesario incluir un identificador UTF-8, como una marca de orden de bytes, al principio de un archivo, use la sobrecarga del método WriteAllLines(String, IEnumerable<String>, Encoding) con UTF8 codificación.

Si el archivo de destino ya existe, se trunca y se sobrescribe.

Puede usar este método para crear el contenido de una clase de colección que toma un IEnumerable<T> en su constructor, como un List<T>, HashSet<T>o una clase SortedSet<T>.

Source:

File.cs

Source:

File.cs

Source:

File.cs

public:
 static void WriteAllLines(System::String ^ path, cli::array <System::String ^> ^ contents);

public static void WriteAllLines (string path, string[] contents);

static member WriteAllLines : string * string[] -> unit

Public Shared Sub WriteAllLines (path As String, contents As String())

Parámetros

Excepciones

Ejemplos

En el ejemplo de código siguiente se muestra el uso del método WriteAllLines para escribir texto en un archivo. En este ejemplo se crea un archivo, si aún no existe y se agrega texto a él.

using System;
using System.IO;
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" };
            File.WriteAllLines(path, createText);
        }

        // 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);

        // Open the file to read from.
        string[] readText = File.ReadAllLines(path);
        foreach (string s in readText)
        {
            Console.WriteLine(s);
        }
    }
}

open System
open System.IO

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" ]
    File.WriteAllLines(path, createText)

// 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)

// Open the file to read from.
let readText = File.ReadAllLines path

for s in readText do
    printfn $"{s}"

Imports System.IO

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"}
            File.WriteAllLines(path, createText)
        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)

        ' Open the file to read from.
        Dim readText() As String = File.ReadAllLines(path)
        Dim s As String
        For Each s In readText
            Console.WriteLine(s)
        Next
    End Sub
End Class

Comentarios

Si el archivo de destino ya existe, se trunca y se sobrescribe.

El comportamiento predeterminado del método WriteAllLines consiste en escribir datos mediante codificación UTF-8 sin una marca de orden de bytes (BOM). Si es necesario incluir un identificador UTF-8, como una marca de orden de bytes, al principio de un archivo, use la sobrecarga del método WriteAllLines(String, String[], Encoding) con UTF8 codificación.

Dado una matriz de cadenas y una ruta de acceso de archivo, este método abre el archivo especificado, escribe la matriz de cadenas en el archivo y, a continuación, cierra el archivo.