public void Add(Object key, Object value) {
if (key == null) {
throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key"));
}
if (!key.GetType().IsSerializable)
throw new ArgumentException(Environment.GetResourceString("Argument_NotSerializable"), "key" );
if( (value != null) && (!value.GetType().IsSerializable) )
throw new ArgumentException(Environment.GetResourceString("Argument_NotSerializable"), "value");
version++;
DictionaryNode last = null;
DictionaryNode node;
for (node = head; node != null; node = node.next) {
if (node.key.Equals(key)) {
throw new ArgumentException(Environment.GetResourceString("Argument_AddingDuplicate__", node.key, key));
}
last = node;
}
if (node != null) {
// Found it
node.value = value;
return;
}
// Not found, so add a new one
DictionaryNode newNode = new DictionaryNode();
newNode.key = key;
newNode.value = value;
if (last != null) {
last.next = newNode;
}
else {
head = newNode;
}
count++;
}