AL0104 - Prefer 'await using' for IAsyncDisposable

‘using’ calls sync Dispose() instead of DisposeAsync()

Source: Al0104PreferAwaitUsingAnalyzer.cs

Description

When a type implements IAsyncDisposable, using using instead of await using calls the synchronous Dispose() method, potentially blocking or skipping async cleanup.

Bad Code

async Task Process()
{
    using var conn = new SqlConnection(connString);
    await conn.OpenAsync();
}

Good Code

async Task Process()
{
    await using var conn = new SqlConnection(connString);
    await conn.OpenAsync();
}

Properties

• Category: Reliability
• Severity: Warning
• Enabled by default: True
• Code fix available: False

Configuration

dotnet_diagnostic.AL0104.severity = warning