enumeration

I am trying to iterate through a list of keys from a hash table using enumeration however I keep getting a NoSuchElementException at the last key in list? Hashtable<String, String> vars = new Hashtable<String, String>(); vars.put("POSTCODE","TU1 3ZU"); vars.put("EMAIL","job.blogs@lumesse.com"); vars.put("DOB","02 Mar 1983"); Enumeration<String> e = vars.keys(); while(e.hasMoreElements()){ System.out.println(e.nextElement()); String param = (String) e.nextElement(); } Console output: EMAIL POSTCODE Exception in thread "main" java.util.NoSuchElementException: Hashtable Enumerator at java.util

Is there a good way to enumerate through only a subset of a Collection in C#? That is, I have a collection of a large number of objects (say, 1000), but I'd like to enumerate through only elements 250 - 340. Is there a good way to get an Enumerator for a subset of the collection, without using another Collection? Edit: should have mentioned that this is using .NET Framework 2.0. Try the following var col = GetTheCollection(); var subset = col.Skip(250).Take(90); Or more generally public static IEnumerable<T> GetRange(this IEnumerable<T> source, int start, int end) { // Error checking removed

When i have a code block static void Main() { foreach (int i in YieldDemo.SupplyIntegers()) { Console.WriteLine("{0} is consumed by foreach iteration", i); } } class YieldDemo { public static IEnumerable<int> SupplyIntegers() { yield return 1; yield return 2; yield return 3; } } can i interpret the principle behind yield return as Main() calls the SupplyIntegers() |1| |2| |3| are stored in contiguous memory block.Pointer of "IEnumerator" Moves to |1| Control returns from SupplyInteger() to Main(). Main() prints the value Pointer Moves to |2|, and so on. Clarifications : (1) Normally we will

I know you can Enumerate the keys or values of NSMutableDictionary using NSEnumerator . Is it possible to do both together? I'm looking for something similar to the PHP foreach enumerator like: foreach ($dictionary as $key => $value); Perhaps look into NSDictionary's method: enumerateKeysAndObjectsUsingBlock:(void (^)(id key, id obj, BOOL *stop)) If you're not familiar with blocks in C/Objective-C, this is a good tutorial: http://thirdcog.eu/pwcblocks/ NSDictionary* d = [NSDictionary dictionaryWithObjectsAndKeys:@"obj1",@"key1", @"obj2",@"key2", @"obj3",@"key3", @"obj4",@"key4",nil]; for (id