ReadLineAsync Method

TextReader.ReadLineAsync Method ()

.NET Framework 4.6 and 4.5

Reads a line of characters asynchronously and returns the data as a string.

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

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public virtual Task<string> ReadLineAsync()

Return Value

Type: System.Threading.Tasks.Task<String>

A task that represents the asynchronous read operation. The value of the TResult parameter contains the next line from the text reader, or is null if all of the characters have been read.

Exception Condition

The number of characters in the next line is larger than MaxValue.


The text reader has been disposed.


The reader is currently in use by a previous read operation.

The TextReader class is an abstract class. Therefore, you do not instantiate it in your code. For an example of using the ReadLineAsync method, see the StreamReader.ReadLineAsync method.

If the current TextReader represents the standard input stream returned by the Console.In property, the ReadLineAsync method executes synchronously rather than asynchronously.

Universal Windows Platform
Available since 4.5
.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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