How can I enumerate through an IDictionary? Please refer to the code below.
public IDictionary<string, string> SelectDataSource
{
set
{
// This line does not work because it returns a generic enumerator,
// but mine is of type string,string
IDictionaryEnumerator enumerator = value.GetEnumerator();
}
}
Manual enumeration is very rare (compared to foreach
, for example) - the first thing I'd suggest is: check you really need that. However, since a dictionary enumerates as key-value-pair:
IEnumerator<KeyValuePair<string,string>> enumerator = value.GetEnumerator();
should work. Or if it is only a method variable (not a field), then:
var enumerator = value.GetEnumerator();
or better (since if it isn't a field it probably needs local disposal):
using(var enumerator = value.GetEnumerator())
{ ... }
or best ("KISS"):
foreach(var pair in value)
{ ... }
However, you should also always dispose any existing value when replaced. Also, a set-only property is exceptionally rare. You really might want to check there isn't a simpler API here... for example, a method taking the dictionary as a parameter.
foreach(var keyValuePair in value)
{
//Do something with keyValuePair.Key
//Do something with keyValuePair.Value
}
OR
IEnumerator<KeyValuePair<string,string>> enumerator = dictionary.GetEnumerator();
using (enumerator)
{
while (enumerator.MoveNext())
{
//Do something with enumerator.Current.Key
//Do something with enumerator.Current.Value
}
}
如果您只想枚举它,只需使用foreach(var item in myDic) ...
示例实现,请参阅MSDN 文章。
using System.Collections;
IDictionary dictionary = ...;
foreach (DictionaryEntry kvp in dictionary) {
object key = kvp.Key;
object value = kvp.Value;
}
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