11,570 questions
According to the documentation at system.io.file.readalllinesasync it is not available in the
.Net Framework. You should be able to use it successfully in .Net 6
File.ReadAllLinesAsync not found
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(19.2, 6%, 11%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMW%3C/text%3E%3C/svg%3E)
Moshe Wiener
36
Reputation points
On VS2019 in a C# program, I try to refer to System.IO.File.ReadAllLinesAsync and get the error:
'File' does not contain a definition for 'ReadAllLinesAsync'
I use .NET6 and Framework4.7.2
Do I need to install anything to get it?
Developer technologies C#
Accepted answer
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RLWA32 49,536 Reputation points2021-12-08T14:03:09.833+00:00