Can you extend a non partial method in a partial class?

Question

I have a generated partial class

public partial interface IPartialInterface
{
   Task<object> Method(string param)
}
public partial class PartialClass : IPartialInterface
{
    public Task<object> Method(string param)
    {
        // does stuff
    }
}

I want to extend the Method so I can plug some logic and then depending on my logic let the PartialClass.Method logic take over or stop it.

Have you heard of partial methods? That's the best you'll be able to get. — gunr2171
– gunr2171, Commented Nov 12, 2021 at 13:05
short answer. you can't. you can't even "extend" a partial method; that's just a declaration meaning "implemented elsewhere". and think about it: in what order would the two parts be executed? what would variable scopes be like? — Franz Gleichmann
– Franz Gleichmann, Commented Nov 12, 2021 at 13:05
Thanks, @FranzGleichmann. I searched for a bit and couldn't find anything. Thought it was just me, but guess not ;( — Emil Aleksandrov
– Emil Aleksandrov, Commented Nov 12, 2021 at 13:07
The Manual is quite informative on what partial methods can and can't do. but in short it's limited to: one part (the generated) of the class defines what the method signature looks like, one part (the user-written) optionally defines what it does. and in the end, you're simply limited to what the generator generated. — Franz Gleichmann
– Franz Gleichmann, Commented Nov 12, 2021 at 13:11

Emil Aleksandrov · Accepted Answer · 2021-11-12 17:35:30Z

0

For people with the same problem, this worked for me:

    public partial interface IGeneratedPartialInterface
    {
        Task<object> Method(string param)
    }
    public partial class GeneratedPartialClass : IGeneratedPartialInterface
    {
        public Task<object> Method(string param)
        {
             // does stuff
        }
    }
        
    public interface MyInterface
    {
        Task<object> MethodExtended(string param)
    }
        
    // added by me, but must be named as the generated partial class
    public partial class GeneratedPartialClass : MyInterface
    {        
        public Task<object> MethodExtended(string param)
        {
            // my logic here example
            if (isInCache(param))
            {
                // do stuff
            }
            else 
            {
                return this.Method(param)
            }
        }
    }

edited Nov 12, 2021 at 17:35

answered Nov 12, 2021 at 15:03

Emil Aleksandrov

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