C#•17mo ago

✅ How to call base implementation in abstract class?

I have following abstract class:

[AttributeUsage( AttributeTargets.Property | AttributeTargets.Field )]
public abstract class UIControlAttribute
    : Attribute
{
    [JsonProperty(PropertyName = "group")]
    public string Group { get; set; }

    public virtual void FillSchema(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture)
    {
        if ( Group != null )
            schemaItem.ParsecMetadata.Group = Group;
    }
}

[AttributeUsage( AttributeTargets.Property | AttributeTargets.Field )]
public abstract class UIControlAttribute
    : Attribute
{
    [JsonProperty(PropertyName = "group")]
    public string Group { get; set; }

    public virtual void FillSchema(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture)
    {
        if ( Group != null )
            schemaItem.ParsecMetadata.Group = Group;
    }
}

Usage:

public class UIControlAesKeyAttribute
    : UIControlAttribute
{
    public override void FillSchema(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture)
    {
        schemaItem.Type = "string";

        schemaItem.ParsecMetadata ??= new();
        schemaItem.ParsecMetadata.UIControlInputType = UIControlInputType.AesKey;
    }
}

public class UIControlAesKeyAttribute
    : UIControlAttribute
{
    public override void FillSchema(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture)
    {
        schemaItem.Type = "string";

        schemaItem.ParsecMetadata ??= new();
        schemaItem.ParsecMetadata.UIControlInputType = UIControlInputType.AesKey;
    }
}

The problem: I want to do schemaItem.ParsecMetadata.Group = Group; in all attributes that inherit UIControlAttribute I know that I can call base.FillSchema( schemaItem, property, culture ); but maybe there is better way to do the same?

32 Replies

ero•17mo ago

unrelated but what language are you using for those code blocks?

sneezey•17mo ago

not sure how right I am, but: You could make a new method that the new functionality overrides, but is a protected keyword method? then the FillSchema can call the new method, then you don't need to remember the base.FillSchema(...) ...? language? you know what server we're in right? 😹

SWEETPONYOP•17mo ago

cpp

ero•17mo ago

yeah you're gonna wanna use cs ;)

sneezey•17mo ago

ohh, i see what you mean 😂 for the markdown language support ```csharp <code> ```

SWEETPONYOP•17mo ago

what about this guys?

[AttributeUsage( AttributeTargets.Property | AttributeTargets.Field )]
public abstract class UIControlAttribute
    : Attribute
{
    [JsonProperty(PropertyName = "group")]
    public string Group { get; set; }

    public void FillSchema(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture)
    {
        FillSchemaDetails(
            schemaItem,
            property,
            culture);

        if (Group != null)
            schemaItem.ParsecMetadata.Group = Group;
    }

    public abstract void FillSchemaDetails(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture);
}

[AttributeUsage( AttributeTargets.Property | AttributeTargets.Field )]
public abstract class UIControlAttribute
    : Attribute
{
    [JsonProperty(PropertyName = "group")]
    public string Group { get; set; }

    public void FillSchema(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture)
    {
        FillSchemaDetails(
            schemaItem,
            property,
            culture);

        if (Group != null)
            schemaItem.ParsecMetadata.Group = Group;
    }

    public abstract void FillSchemaDetails(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture);
}

and then I override FillSchemaDetails not FillSchema but call FillSchema

sibber•17mo ago

$code

MODiX•17mo ago

To post C# code type the following: ```cs // code here ``` Get an example by typing $codegif in chat If your code is too long, post it to: https://paste.mod.gg/

sneezey•17mo ago

I think you can make FillSchemaDetails protected, then it forces usage on the FillSchema and wont be tempted to use FillSchemaDetails? happy to be told otherwise 😆

ero•17mo ago

calling the base ctor is the correct option here

sibber•17mo ago

thats what i was going to suggest

SWEETPONYOP•17mo ago

I don't understand why we don't have public protected abstract

ero•17mo ago

we do?

sneezey•17mo ago

you cant have public + protected at the same time 😅

sibber•17mo ago

.net uses that approach actually

ero•17mo ago

yeah they corrected it lol

SWEETPONYOP•17mo ago

ah I'm sorry

sibber•17mo ago

e.g. for collections, they dont let you override .Add, instead you override .AddItem

sneezey•17mo ago

^ this i was giving another option, but doing base. is the right thing

sibber•17mo ago

what do you expect that to do

SWEETPONYOP•17mo ago

I wrote smth wrong but I just need to do following: 1. can override 2. don't let to call

ero•17mo ago

this seems like a bit of a weird use of an attribute

sibber•17mo ago

dont let who call it? can override => virtual have to override => abstract

SWEETPONYOP•17mo ago

let's see:

var controlAttribute = property
   .GetCustomAttribute<UIControlAttribute>();

controlAttribute.FillSchema( schemaItem, property, culture );

var controlAttribute = property
   .GetCustomAttribute<UIControlAttribute>();

controlAttribute.FillSchema( schemaItem, property, culture );

using FillSchema is ok but I can call FillSchemaDetails and it is not ok

ero•17mo ago

. also can you stop using ```cpp lol not that it matters actually

SWEETPONYOP•17mo ago

protected abstract?

ero•17mo ago

mhm

sibber•17mo ago

dont make it public then

ero•17mo ago

didn't wanna make it sound like it's that big a deal

sneezey•17mo ago

protected abstract void FillSchemaDetails(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture);

protected abstract void FillSchemaDetails(
        UISchemaItem schemaItem,
        PropertyInfo property,
        CultureInfo culture);

like that - the first word from public to protected

SWEETPONYOP•17mo ago

ahh okay, I understand now

protected abstract void FillSchemaDetails(..)

public class UIControlCatalogAttribute
    : UIControlAttribute
{
    protected override void FillSchemaDetails(..)
}

protected abstract void FillSchemaDetails(..)

public class UIControlCatalogAttribute
    : UIControlAttribute
{
    protected override void FillSchemaDetails(..)
}

yeah, thanks for helping

sneezey•17mo ago

🙌

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✅ How to call base implementation in abstract class?