how to check if List<T> element contains an item with a Particular Property Value

Question

public class PricePublicModel {     public PricePublicModel() { }      public int PriceGroupID { get; set; }     public double Size { get; set; }     public double Size2 { get; set; }     public int[] PrintType { get; set; }     public double[] Price { get; set; } }  List<PricePublicModel> pricePublicList = new List<PricePublicModel>(); 

How to check if element of pricePublicList contains certain value. To be more precise, I want to check if there exists pricePublicModel.Size == 200? Also, if this element exists, how to know which one it is?

EDIT If Dictionary is more suitable for this then I could use Dictionary, but I would need to know how :)

Answer 1

If you have a list and you want to know where within the list an element exists that matches a given criteria, you can use the FindIndex instance method. Such as

int index = list.FindIndex(f => f.Bar == 17); 

Where f => f.Bar == 17 is a predicate with the matching criteria.

In your case you might write

int index = pricePublicList.FindIndex(item => item.Size == 200); if (index >= 0)  {     // element exists, do what you need }