Interface prefix (ARCH004)

Key dotnet.naming.interface-prefix · Severity warning · Category naming

Interface names should start with the I prefix. This is the standard .NET convention and clarifies that the type is an interface.

Incorrect

public interface OrderRepository
{
    Order Find(int id);
}

Correct

public interface IOrderRepository
{
    Order Find(int id);
}

Fix

Add the I prefix to the interface name. If needed, suppress the rule per project/workspace via except/ignore.