A postfix `!` (`user!.Name`, `GetValue()!`) that tells the compiler a value is not null. It silences the nullable warning without checking anything.
Each example shows the exact code shape the rule is looking for, then the smallest version that keeps the intent without hiding risk or adding noise.
public string ShippingLabel(Order order)
{
var address = _addresses.Find(order.AddressId);
return address!.FormatLabel();
}Deterministic line match on masked source: flags `!` directly after an identifier, `)` or `]` when followed by whitespace, `.`, `;`, `,`, a closing bracket, or the end of the line.
public string ShippingLabel(Order order)
{
var address = _addresses.Find(order.AddressId)
?? throw new InvalidOperationException($"Order {order.Id} has no address");
return address.FormatLabel();
}Handle the null: guard and throw with context, use `??` with a real default, or restructure so the type is non-nullable. Use `!` only where non-null is provable, and say why.
When nullable analysis flags a possible null, the quickest route to a clean build is one character. The null check the warning asked for never gets written.
ai-slop/csharp-null-forgiving
ai-slop
Deterministic line match on masked source: flags `!` directly after an identifier, `)` or `]` when followed by whitespace, `.`, `;`, `,`, a closing bracket, or the end of the line.
`!=` comparisons, logical-not prefixes such as `!isValid`, and `!` inside strings or comments are not flagged.
Part of aislop's C# rule set. First-class C# support, including C#-specific AI-slop rules, arrived in aislop v0.14.1.