NameValueCollection 与 Dictionary
我应该使用 Dictionary
（在 C# / .NET Framework 中）
选项 1，使用 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
}
选项 2，使用 Dictionary
//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
}
对于这些用例，使用其中一种与另一种相比是否有任何优势？在性能、内存使用、排序顺序等方面有什么区别吗？
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.?
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评论（3）
它们在语义上并不相同。
NameValueCollection可以有重复的键，而Dictionary则不能。就我个人而言，如果您没有重复的键，那么我会坚持使用
Dictionary。它更现代，使用IEnumerable<>，这使得与Linq查询混合起来很容易。您甚至可以使用LinqToDictionary()方法创建一个Dictionary。They aren't semantically identical. The
NameValueCollectioncan have duplicate keys while theDictionarycannot.Personally if you don't have duplicate keys, then I would stick with the
Dictionary. It's more modern, usesIEnumerable<>which makes it easy to mingle withLinqqueries. You can even create aDictionaryusing theLinqToDictionary()method.NameValueCollection是string类型，而Dictionary利用泛型来允许类型变化。请参阅泛型的优点。NameValueCollectionisstringtyped whereasDictionaryleverages generics to allow type variance. See Benefits of Generics.Dictionary会快得多。NameValueCollection允许重复键。这在某些情况下可能是不好的，但在其他情况下可能是理想的。字典不允许重复的键。来自： http://msdn.microsoft.com/en-us/library/ xfhwa508.aspx
Dictionarywill be much faster.NameValueCollectionallows duplicate keys. Which could be bad in certain situations, or desired in other.Dictionarydoes not allow duplicate keys.From: http://msdn.microsoft.com/en-us/library/xfhwa508.aspx