Petr Onderka Comments - Answer Overflow

Petr Onderka

•Created by WiredWizard on 11/20/2023 in #technical-questions

Trying to override a method and pass an enum

Hi, we prefer using Slack now, see https://discord.com/channels/1108042639565127740/1108407291209842838/1164523200231772190. Coincidentally (?), somebody just asked a very similar question there, I think that should answer your question: https://metalama.slack.com/archives/C03Q89ZGAQJ/p1700560350125159?thread_ts=1700514869.690389&cid=C03Q89ZGAQJ.

3 replies

MCMetalama Community

•Created by Whit on 10/6/2023 in #technical-questions

How to inject factory-based dependencies from method aspect into type?

It's possible and it's documented here: https://doc.metalama.net/conceptual/aspects/dependency-injection#implementing-an-adaptor-for-a-new-dependency-injection-framework. Specifically, it would look like this (using 2023.4.3-preview):

3 replies

MCMetalama Community

•Created by Lance on 10/3/2023 in #technical-questions

IntroduceDependency with record types

Thanks for the report. This is a bug in Metalama. Can you create an issue on our GitHub (https://github.com/postsharp/Metalama/issues/new) for this?

5 replies

MCMetalama Community

•Created by Drago-QCC on 9/30/2023 in #technical-questions

Giving Aspects Metadata ?

If I understand you correctly, the simplest way to do this is to add the data to the aspect class:

public class HookFunctionAndPrint : OverrideMethodAspect
{
    public string? LoggingLevel { get; }

    public HookFunctionAndPrint(string? loggingLevel = null)
    {
        LoggingLevel = loggingLevel;
    }

    public override dynamic? OverrideMethod()
    {
          if(LoggingLevel == "Verbose")
          {
              Console.WriteLine("verbose logging enabled");
          }
          ...
    }
  }
}

class Program
{
    [HookFunctionAndPrint("Verbose")]
    static void Main()
    {
    }
}

public class HookFunctionAndPrint : OverrideMethodAspect
{
    public string? LoggingLevel { get; }

    public HookFunctionAndPrint(string? loggingLevel = null)
    {
        LoggingLevel = loggingLevel;
    }

    public override dynamic? OverrideMethod()
    {
          if(LoggingLevel == "Verbose")
          {
              Console.WriteLine("verbose logging enabled");
          }
          ...
    }
  }
}

class Program
{
    [HookFunctionAndPrint("Verbose")]
    static void Main()
    {
    }
}

If you want to keep it on another attribute, you can, by reading the attribute from your aspect:

public class HookFunctionAndPrint : OverrideMethodAspect
{
    public override dynamic? OverrideMethod()
    {
        var loggingLevel = meta.Target.Declaration.Attributes.OfAttributeType(typeof(MetaLamaMetadataAttribute))
            .SingleOrDefault(a => a.ConstructorArguments[0].Value is "Logging")
            ?.ConstructorArguments[1].Value;
        
        if(loggingLevel is "Verbose")
        {
            Console.WriteLine("verbose logging enabled");
        }

        ...
    }
}

class C
{
    [HookFunctionAndPrint]
    [MetaLamaMetadata("Logging", "Verbose")]
    static void Main()
    {
    }
}

[AttributeUsage(AttributeTargets.All, AllowMultiple = true)]
internal class MetaLamaMetadataAttribute : Attribute
{
    public string Key { get; }
    public string Value { get; }

    public MetaLamaMetadataAttribute(string key, string value)
    {
        Key = key;
        Value = value;
    }
}

public class HookFunctionAndPrint : OverrideMethodAspect
{
    public override dynamic? OverrideMethod()
    {
        var loggingLevel = meta.Target.Declaration.Attributes.OfAttributeType(typeof(MetaLamaMetadataAttribute))
            .SingleOrDefault(a => a.ConstructorArguments[0].Value is "Logging")
            ?.ConstructorArguments[1].Value;
        
        if(loggingLevel is "Verbose")
        {
            Console.WriteLine("verbose logging enabled");
        }

        ...
    }
}

class C
{
    [HookFunctionAndPrint]
    [MetaLamaMetadata("Logging", "Verbose")]
    static void Main()
    {
    }
}

[AttributeUsage(AttributeTargets.All, AllowMultiple = true)]
internal class MetaLamaMetadataAttribute : Attribute
{
    public string Key { get; }
    public string Value { get; }

    public MetaLamaMetadataAttribute(string key, string value)
    {
        Key = key;
        Value = value;
    }
}

6 replies

MCMetalama Community

•Created by Whit on 9/3/2023 in #technical-questions