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c#iequalitycomparer
griegs
griegs

Reputation: 22760

IEqualityComparer string value within object

I quite possibly am doing this the wrong way but;

I have a list of objects in LINQ;

MyObj
  string name
  string somethingElse

List<MyObj> myObjects;

Now I'm trying to see if any object in that list has a string value;

So I have;

if (Model.myObjects.Contains("thisobject", new MyObjComparer()))
{
}

In the comparer I have;

public class MyObjComparer: IEqualityComparer<MyObj>
{
    public bool Equals(string containsString, MyObj obj)
    {
        return obj.name == containsString;
    }
}

How can I use a comparer to check against a string value in an objects field?

Upvotes: 3

Views: 4863

Answers (3)

Jacob
Jacob

Reputation: 78840

An easier method is to do this:

if (Model.myObjects.Any(o => o.name == "thisobject"))
{
}

Upvotes: 10

Harry Steinhilber
Harry Steinhilber

Reputation: 5239

The equality comparer is only good to tell if two objects of the same type are equal. I don't know your use-case, but could you simply do something like 

if (Model.myObjects.Where(x => x.name == "thisobject").Any())
{ 
    // Do something
}

Upvotes: 2

Chandu
Chandu

Reputation: 82913

You can use FindAll method as follows:

foreach(var item in Model.myObjects.FindAll(x=>x.Contains("thisobject")))
{
 //Do your stuff with item  
}

Upvotes: 2

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