CRR0034 - The asynchronous method should contain the "Async" suffix

• Nov 30, 2020

This analyzer detects asynchronous methods without the “Async” suffix.

C#

async Task ProcessFile(string path, CancellationToken cancellationToken)
{
    cancellationToken.ThrowIfCancellationRequested();
    var lines = await File.ReadAllLinesAsync(path, cancellationToken).ConfigureAwait(false);
    foreach (var line in lines)
    {
        cancellationToken.ThrowIfCancellationRequested();
        //...
    }    
}

VB.NET

Private Async Function ProcessFile(ByVal path As String, ByVal cancellationToken As CancellationToken) As Task
    cancellationToken.ThrowIfCancellationRequested()
    Dim lines = Await File.ReadAllLinesAsync(path, cancellationToken).ConfigureAwait(False)

    For Each line In lines
        cancellationToken.ThrowIfCancellationRequested()
    Next
       '...   
End Function

Asynchronous methods should contain the “Async” suffix to differentiate synchronous and asynchronous methods. Refer to the Important Info and Advice section of the Asynchronous programming article for more information.

C#

async Task ProcessFileAsync(string path, CancellationToken cancellationToken)
{
    cancellationToken.ThrowIfCancellationRequested();
    var lines = await File.ReadAllLinesAsync(path, cancellationToken).ConfigureAwait(false);
    foreach (var line in lines)
    {
        cancellationToken.ThrowIfCancellationRequested();
        //...
    }    
}

VB.NET

Private Async Function ProcessFileAsync(ByVal path As String, ByVal cancellationToken As CancellationToken) As Task
    cancellationToken.ThrowIfCancellationRequested()
    Dim lines = Await File.ReadAllLinesAsync(path, cancellationToken).ConfigureAwait(False)

    For Each line In lines
        cancellationToken.ThrowIfCancellationRequested()
    Next
       '...   
End Function