C# Dictionary<TKey,TValue> 中的不同值
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Distinct Values in Dictionary<TKey,TValue>
提问by
I'm trying to loop over distinct values over a dictionary list:
我正在尝试通过字典列表遍历不同的值：
So I have a dictionary of key value pairs .
所以我有一个键值对字典。
How do I get just the distinct values of string keys from the dictionary list?
如何从字典列表中获取字符串键的不同值？
采纳答案by Randolpho
var distinctList = mydict.Values.Distinct().ToList();
Alternatively, you don't need to call ToList():
或者，您不需要调用 ToList()：
foreach(var value in mydict.Values.Distinct())
{
// deal with it.
}
Edit:I misread your question and thought you wanted distinct values from the dictionary. The above code provides that.
编辑：我误读了您的问题，并认为您想要字典中的不同值。上面的代码提供了这一点。
Keys are automatically distinct. So just use
键是自动不同的。所以只需使用
foreach(var key in mydict.Keys)
{
// deal with it
}
回答by LBushkin
Looping over distinct keys and doing something with each value...
循环不同的键并对每个值做一些事情......
foreach( dictionary.Keys )
{
// your code
}
If you're using C# 3.0 and have access to LINQ:
如果您使用的是 C# 3.0 并且可以访问 LINQ：
Just fetching the set of distinct values:
只需获取一组不同的值：
// you may need to pass Distinct an IEqualityComparer<TSource>
// if default equality semantics are not appropriate...
foreach( dictionary.Values.Distinct() )
{
}
回答by Philippe Leybaert
Keys are distinct in a dictionary. By definition.
字典中的键是不同的。根据定义。
So myDict.Keysis a distinct list of keys.
所以myDict.Keys是一个不同的键列表。
回答by Reed Copsey
If the dictionary is defined as:
如果字典定义为：
Dictionary<string,MyType> theDictionary = ...
Then you can just use
然后你就可以使用
var distinctKeys = theDictionary.Keys;
This uses the Dictionary.Keysproperty. If you need a list, you can use:
这使用Dictionary.Keys属性。如果你需要一个列表，你可以使用：
var dictionaryKeysAsList = theDictionary.Keys.ToList();
Since it's a dictionary, the keys will already be distinct.
因为它是一本字典，所以键已经不同了。
If you're trying to find all of the distinct values (as opposed to keys - it wasn't clear in the question) in the dictionary, you could use:
如果您试图在字典中找到所有不同的值（而不是键 - 问题中不清楚），您可以使用：
var distinctDictionaryValues = theDictionary.Values.Distinct(); // .ToList();
