CSharp使用Dictionary_GetValueOrGetKey
Dictionary<string, string> map = new Dictionary<string, string>();
map.Add(“1”, “1”);
map.Add(“2”, “2”);
map.Add(“3”, “2”);
1.foreach KeyValuePair traversing
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| foreach (KeyValuePair<string, string> e in map)
{
if (e.Value.Equals("2"))
{
}
}
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2.foreach map.Keys
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| foreach (string key in map.Keys)
{
if (map[key].Equals("2"))
{
}
}
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3.Linq
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| //get all keys
var keys = map.Where(x => x.Value == "2").Select(y => y.Key);
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4.Get first key
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| var firstKey = map.FirstOrDefault(x => x.Value == "2").Key;
|