Linq cast object

Question

I am trying to check if one exists before adding but casting within .Any does not work.

People is ObservableCollection of objects because each can be different class (each has FirstLastName property).

ObservableCollection<object> People = new ObservableCollection<object>();

foreach (cEmployee t in Group1)
{
  if (!People.Any((cEmployee)x => x.FirstLastName == t.FirstLastName) 
      People.Add(new cEmployee(t));              
}

Is there a workaround?

x.FirstLastName.Trim().ToLower() == t.FirstLastName.Trim().ToLower(), may be give that a try — AD.Net, Jan 27 '14 at 20:11

score 5 · Accepted Answer · answered Jan 27 '14 at 20:12

5

If they are all guaranteed to have a FirstName property one option is to use dynamic

if (!People.Any((dynamic x) => x.FirstName == t.FirstName)) { 
  ...
}

This isn't type safe but will function if all values do indeed have the property. If on the other hand they all implement a common base type or interface with the FirstName property then you can use that

if (!People.OfType<TheType>().Any(x => x.FirstName == t.FirstName)) { 
  ...
}

answered Jan 27 '14 at 20:12

JaredPar

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Thank you very much! I never came across dynamic. This is it! – Daniel Jan 27 '14 at 20:33

score 1 · Answer 2 · answered Jan 27 '14 at 20:16

1

Are you sure you need to call People.Add(new cEmployee(t)), and not People.Add((cEmployee)t) or even just People.Add(t) ?

answered Jan 27 '14 at 20:16

Martin

920
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24

Linq cast object

2 Answers2