File.AppendAllLines Metod

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

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

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

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

Parametrar

Undantag

Exempel

I följande exempel skrivs markerade rader från en exempeldatafil till en fil och sedan läggs fler rader till. Katalogen med namnet temp på enhet C måste finnas för att exemplet ska kunna slutföras.

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

Kommentarer

Metoden skapar filen om den inte finns, men den skapar inte nya kataloger. Därför måste värdet för parametern path innehålla befintliga kataloger.

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

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

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

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

Parametrar

Undantag

Kommentarer

Metoden skapar filen om den inte finns, men den skapar inte nya kataloger. Därför måste värdet för parametern path innehålla befintliga kataloger.

Du kan använda den här metoden för att skapa en fil som innehåller följande:

• Resultatet av en LINQ-till-objekt-fråga på raderna i en fil, enligt ReadLines metoden .

• Innehållet i en samling som implementerar en IEnumerable<T> sträng.