AL0020 - IFormCollection requires explicit attribute

IFormCollection parameters must have an explicit [FromForm] attribute

Source: AL0020ToAL0024FormBindingAnalyzer.cs

Description

IFormCollection parameters must have an explicit [FromForm] attribute. Unlike IFormFile which auto-binds, IFormCollection requires explicit attribution for clarity and safety.

Bad Code

app.MapPost("/", (IFormCollection form) => ...);

Good Code

app.MapPost("/", ([FromForm] IFormCollection form) => ...);

Properties

• Category: ASP.NET Core
• Severity: Error
• Enabled by default: True
• Code fix available: False

Configuration

dotnet_diagnostic.AL0020.severity = warning