How to find out the index of elements in list using C# lambda expression application

1. Write a rule method first

private bool check(string str){
 return ("xxx");
}

2. Write another Predicate

Predicate<string> predicate=new Predicate<string>(check));

If the logic is not complicated, you can write it like this

private void OpenMenu(GameObject gob){
 Predicate<string> predicate=new Predicate<string>(s =>() );
 int i=_nameList.FindIndex(predicate);
}

Predicate can be simplified

Predicate<string> predicate = s => ();

Just put it in the list

int index=_nameList.FindIndex(s => ());

No found Return -1

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