5

I have a method with a signature like this

void RefreshMethod<T>(IEnumerable<T> lst, string propertyName) where T:class
{
   Type type = typeof(T);
   PropertyInfo property = type.GetProperties().Single(u => u.Name == primaryKeyProperty);
  //query goes here
}

Now i want to query that collection for getting all the values whose

propertyName < 0

In a simple scenario it would be as easy as this

lst.where(u=>u.ID<0)

But here i don't have that ID property but have corresponding "PropertyInfo" object.

How should i acheive this.

kindly guide

Maarten
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MegaMind
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1 Answers1

8

You can lookup the property-value using property.GetValue(anObjectOfTypeT, null).

So something like:

var refreshedList =  lst.Where(l => ((int)(property.GetValue(l, null)) < 0).ToList();

This assumes the property will always be of type int though.

Maarten
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  • Brilliant, just what I needed :) – smirkingman Apr 16 '13 at 20:20
  • Is there a way to do it for other types of properties? – Scar Feb 13 '17 at 03:52
  • @Scar What do you mean, a property of type string, or double, or some other type? You can change the casting to `int`, but you do need to know the type beforehand. – Maarten Feb 13 '17 at 07:47
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    @Maarten I mean if i have to do this for multiple properties of different types, is there any other way other than create a different var for each datatype? – Scar Feb 17 '17 at 06:59