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

StreamWriter.WriteLineAsync Method (System.IO) | Microsoft Learn

Source:

StreamWriter.cs

Source:

StreamWriter.cs

Source:

StreamWriter.cs

Source:

StreamWriter.cs

Asynchronously writes a subarray of characters to the stream, followed by a line terminator.

public:
 override System::Threading::Tasks::Task ^ WriteLineAsync(cli::array <char> ^ buffer, int index, int count);

public override System.Threading.Tasks.Task WriteLineAsync(char[] buffer, int index, int count);

[System.Runtime.InteropServices.ComVisible(false)]
public override System.Threading.Tasks.Task WriteLineAsync(char[] buffer, int index, int count);

override this.WriteLineAsync : char[] * int * int -> System.Threading.Tasks.Task

[<System.Runtime.InteropServices.ComVisible(false)>]
override this.WriteLineAsync : char[] * int * int -> System.Threading.Tasks.Task

Public Overrides Function WriteLineAsync (buffer As Char(), index As Integer, count As Integer) As Task

buffer

Char[]

The character array to write data from.

index

Int32

The character position in the buffer at which to start reading data.

count

Int32

The maximum number of characters to write.

A task that represents the asynchronous write operation.

Attributes

The index plus count is greater than the buffer length.

index or count is negative.

The stream writer is disposed.

The stream writer is currently in use by a previous write operation.

The following example shows how to write characters to two separate lines in a text file by using the WriteLineAsync(Char[], Int32, Int32) method. The first line contains the first 11 characters from the string (the letters "First line" followed by a space). The second line contains the remaining characters from the string (the letters "and second line").

using System.IO;
using System.Text;

namespace ConsoleApplication
{
    class Program6
    {
        static void Main()
        {
            WriteCharacters();
        }

        static async void WriteCharacters()
        {
            UnicodeEncoding ue = new UnicodeEncoding();
            char[] charsToAdd = ue.GetChars(ue.GetBytes("First line and second line"));
            using (StreamWriter writer = File.CreateText("newfile.txt"))
            {
                await writer.WriteLineAsync(charsToAdd, 0, 11);
                await writer.WriteLineAsync(charsToAdd, 11, charsToAdd.Length - 11);
            }
        }
    }
}

Imports System.IO
Imports System.Text

Module Module1

    Sub Main()
        WriteCharacters()
    End Sub

    Async Sub WriteCharacters()
        Dim ue As UnicodeEncoding = New UnicodeEncoding()
        Dim charsToAdd() = ue.GetChars(ue.GetBytes("First line and second line"))

        Using writer As StreamWriter = File.CreateText("newfile.txt")
            Await writer.WriteLineAsync(charsToAdd, 0, 11)
            Await writer.WriteLineAsync(charsToAdd, 11, charsToAdd.Length - 11)
        End Using
    End Sub
End Module

The line terminator is defined by the TextWriter.NewLine property.

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