Not implemented exception (ARCH706)

Key dotnet.codequality.not-implemented-exception · Severity warning · Category codequality · Principle LiskovSubstitution

Members that throw NotImplementedException mean a subtype does not honor its contract, leading to unexpected runtime crashes.

Incorrect

public class CsvExporter : IExporter
{
    public void Export(Report report)
    {
        throw new NotImplementedException();
    }
}

Correct

public class CsvExporter : IExporter
{
    public void Export(Report report)
    {
        using var writer = new StreamWriter(report.Path);
        foreach (var row in report.Rows)
            writer.WriteLine(string.Join(',', row));
    }
}

Fix

Actually implement the functionality; if a type is not yet supported, do not implement the interface or document the unsupported behavior explicitly.