KeyValuePair VS DictionaryEntry

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There are some difference between KeyValuePair which is the generic version and DictionaryEntry which is non generic version. 

1. KeyValuePair < T,T > is for iterating through Dictionary < T,T >. This is the .Net 2 way of doing things.
2. DictionaryEntry is for iterating through HashTables. This is the .Net 1 way of doing things.
3. KeyValuePair<TKey,TValue> is used in place of DictionaryEntry because it is generic.

Dictionary<string, int> dict = new Dictionary<string, int>();
foreach (KeyValuePair<string, int> item in dict) {
  int i = item.Value;
}

Hashtable hashtable = new Hashtable();
foreach (DictionaryEntry item in hashtable) {
  // Cast required because compiler doesn‘t know it‘s a <string, int> pair.
  int i = (int) item.Value;
}

KeyValuePair VS DictionaryEntry

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原文地址：http://www.cnblogs.com/dennysong/p/5621277.html