NameValueCollection vs Dictionary<string,string>

Question

Possible Duplicate:
IDictionary<string, string> or NameValueCollection

Any reason I should use Dictionary<string,string> instead of NameValueCollection?

(in C# / .NET Framework)

Option 1, using NameValueCollection:

//enter values:
NameValueCollection nvc = new NameValueCollection()
{
  {"key1", "value1"},
  {"key2", "value2"},
  {"key3", "value3"}
};

// retrieve values:
foreach(string key in nvc.AllKeys)
{
  string value = nvc[key];
  // do something
}

Option 2, using Dictionary<string,string>...

//enter values:
Dictionary<string, string> dict = new Dictionary<string, string>()
{
  {"key1", "value1"},
  {"key2", "value2"},
  {"key3", "value3"}
};

// retrieve values:
foreach (KeyValuePair<string, string> kvp in dict)
{
  string key = kvp.Key;
  string val = kvp.Value;
  // do something
}

For these use cases, is there any advantage to use one versus the other? Any difference in performance, memory use, sort order, etc.?

Answer 1

They aren't semantically identical. The NameValueCollection can have duplicate keys while the Dictionary cannot.

Personally if you don't have duplicate keys, then I would stick with the Dictionary. It's more modern, uses IEnumerable<> which makes it easy to mingle with Linq queries. You can even create a Dictionary using the Linq ToDictionary() method.