FlySwat FlySwat - 3 months ago 5
C# Question

Checking for duplicates in a collection

Suppose you have a collection of

Foo
classes:

class Foo
{
public string Bar;
public string Baz;
}

List<Foo> foolist;


And you want to check this collection to see if another entry has a matching
Bar
.

bool isDuplicate = false;
foreach (Foo f in foolist)
{
if (f.Bar == SomeBar)
{
isDuplicate = true;
break;
}
}


Contains()
doesn't work because it compares the classes as whole.

Does anyone have a better way to do this that works for .NET 2.0?

Answer
fooList.Exists(item => item.Bar == SomeBar)

That's not LINQ, but a Lambda expression, but nevertheless, it uses a v3.5 feature. No problem:

fooList.Exists(delegate(Foo Item) { return item.Bar == SomeBar});

That should work in 2.0.

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