在C＃中获取Dictionary最高值的键，其中value可以为null [英] get the key of the highest value of a Dictionary in C# where value may be null

问题描述

假设我有一个

 Dictionary< string，double>结果
 

我需要在C＃中获取字典最高值的关键字，来自



（ http://stackoverflow.com/questions/2805703/good-way-to-get-the-key-of-the-highest-value-of-a-dictionary-in-c-sharp [ ^ ]



我有：

  var  max = results.Aggregate（（l，r）= > ;  l.Value >  r.Value？l：r）.Key; 

如何更改语法以管理字典可以包含空值的情况。（如果为null，我不想考虑该关联键，只需跳过该键）



谢谢

解决方案

这个怎么样：

字典<字符串， double ？>  results =  new 字典<字符串， double ？> （） {
 {  A， 12 . 0 }，
 {  B， 10 。 0 }，
 {  C， null }，
 {   D， 15 。 0 }，
 {   E， 5 。 0 } 
}; 
 
   var  max = 来自 x  in 结果其中​​ x.Value == results.Max（v = >  v.Value）选择 x.Key;  
 
 max.Dump（）; 

suppose I have a

Dictionary<string,double> results

I need to get the key of the highest value of a Dictionary in C#, from

(http://stackoverflow.com/questions/2805703/good-way-to-get-the-key-of-the-highest-value-of-a-dictionary-in-c-sharp[^]

I have:

var max = results.Aggregate((l, r) => l.Value > r.Value ? l : r).Key;

How should I change the syntax to manage also the case in which the dictionary can contain null value. (if null, I do not want to consider that associated key, just skip that key)

Thanks

解决方案

What about this:

Dictionary<string,double?> results = new Dictionary<string,double?>(){
    {"A", 12.0},
    {"B", 10.0},
    {"C", null},
    {"D", 15.0},
    {"E", 5.0}
};

var max = from x in results where x.Value == results.Max(v => v.Value) select x.Key;

max.Dump();

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