Checking if a list of objects contains a property with a specific value

Question

Say I have the following code:

class SampleClass
{
 public int Id {get; set;}
 public string Name {get; set;}
}
List<SampleClass> myList = new List<SampleClass>();
//list is filled with objects
...
string nameToExtract = "test";

So my question is what List function can I use to extract from myList only the objects that have a Name property that matches my nameToExtract string.

I apologize in advance if this question is really simple/obvious.

• sonyisda1: The Name property in the SampleClass class should be of type string right?

Answer 1

You can use the Enumerable.Where extension method:

var matches = myList.Where(p => p.Name == nameToExtract);

Returns an IEnumerable<SampleClass>. Assuming you want a filtered List, simply call .ToList() on the above.

---

By the way, if I were writing the code above today, I'd do the equality check differently, given the complexities of Unicode string handling:

var matches = myList.Where(p => String.Equals(p.Name, nameToExtract, StringComparison.CurrentCulture));

See also

• IAbstract: Does this return all of the objects that match nameToExtract?
• Dan J: Specifically, all the objects whose Name property matches nameToExtract, yes.
• BenKoshy: thx - is there a boolean version whcih simply returns true or false if it does or doesn't exist?
• Dan J: @BKSpurgeon Yes, that's the Any() method.

Answer 2

list.Any(x=>x.name==string)

Could check any name prop included by list.

• RuhrpottDev: This is the best solution for this question. Also because it's much better to read.
• Dan J: I think this answer may have missed the requirements of the question: the OP is asking how to produce a new list that contains only those elements of the original list whose Name property matches a value. The .Any() method does not do that.

Answer 3

myList.Where(item=>item.Name == nameToExtract)

Answer 4

Further to the other answers suggesting LINQ, another alternative in this case would be to use the FindAll instance method:

List<SampleClass> results = myList.FindAll(x => x.Name == nameToExtract);

Answer 5

using System.Linq; 
list.Where(x=> x.Name == nameToExtract);

Edit: misread question (now all matches)