Hashtable.Contains(object)

Description

Определяет, содержит ли хэш-таблица указанный ключ.

This method implements IDictionary.Contains. It behaves exactly like ContainsKey. This method is an O(1) operation.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Hashtable h;
    void Example() {
        h = new Hashtable();
        h.Add(1, "one");
        h.Add(2, "two");
        h.Add(3, "two");
        if (h.Contains(1))
            Debug.Log("Key '1', has been found!");
        
    }
}