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 lt PricePublicModel gt  pricePublicList   new List lt PricePublicModel gt       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

User · Accepted Answer

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
}

User · Answer

You don t actually need LINQ for this because List lt T gt  provides a method that does exactly what you want  Find      Searches for an element that matches the conditions defined by the specified predicate  and returns the first occurrence within the entire List lt T gt     Example code   PricePublicModel result   pricePublicList Find x   gt  x Size    200

User · Answer

var item   pricePublicList FirstOrDefault x   gt  x Size    200   if  item    null          There exists one with size 200 and is stored in item now   else        There is no PricePublicModel with size 200

User · Answer

This is pretty easy to do using LINQ   var match   pricePublicList FirstOrDefault p   gt  p Size    200   if  match    null           Element doesn t exist

User · Answer

You can using the exists  if  pricePublicList Exists x   gt  x Size    200          code

User · Answer

bool contains   pricePublicList Any p   gt  p Size    200

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

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