GENiALi's Blog

inDE Original

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There, a lot was necessary until I had the spin out or got the right Tip .

Request:

I have an ArrayList of objects of type person in it. ArrayList therefore because the collection must be COM visible. Generics do not work there.

I wanted to have the convenience to make type-safe queries, but also on an ArrayList. If you have the hang in LINQ to Objects out times one wants to make it no longer.

ArrayList arl = new ArrayList();
arl.Add(new Person(){ID= .......}); 

arl.Add(new Person(){ID= .......}); 

arl.Add(new Person(){ID= .......}); 
  
Person person = arl.Where(p => p.ID == ID).FirstOrDefault(); //Geht nicht.

Solution:

Person person = arl.OfType<Person>().Where(p => p.ID == ID).FirstOrDefault();

Just between the collection and where a OfType < T > () reinhängen.

And as I said, I would like to to generics. But COM visible not possible therefore.