StringWriter.WriteLineAsync Method (Char)

.NET Framework (current version)

Writes a character followed by a line terminator asynchronously to the string.

Namespace:   System.IO
Assembly:  mscorlib (in mscorlib.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public override Task WriteLineAsync(
	char value


Type: System.Char

The character to write to the string.

Return Value

Type: System.Threading.Tasks.Task

A task that represents the asynchronous write operation.

Exception Condition

The string writer is disposed.


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

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

The following example shows how to write characters by using the WriteLineAsync(Char) method.

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

namespace ConsoleApplication
    class Program
        static void Main(string[] args)

        static async void WriteCharacters()
            StringBuilder stringToWrite = new StringBuilder("Characters in StringBuilder");

            using (StringWriter writer = new StringWriter(stringToWrite))
                UnicodeEncoding ue = new UnicodeEncoding();
                char[] charsToAdd = ue.GetChars(ue.GetBytes("and chars to add"));
                foreach (char c in charsToAdd)
                    await writer.WriteLineAsync(c);
// The example displays the following output:
// Characters in StringBuilder
// a
// n
// d 
// c
// h
// a
// r
// s
// t
// o
// a
// d
// d

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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