在字典中查找重复值,并打印重复元素的键 [英] Finding duplicate values in dictionary and print Key of the duplicate element
问题描述
可以使用最快检查字典中重复值并打印其键的方法是什么?
字典 MyDict
其具有以下值,
键值
22 100
22 10025 100
25 100 > 29 20039 400 500
示例:键22和25具有相同的值,我需要打印22和25有重复的值。
这取决于。
如果你有一个不断变化的字典,只需要得到一次,使用这个:
MyDict.GroupBy (x => x.Value).Where(x => x.Count()> 1)
$ b b
然而,如果你有一个或多或少静态的字典,并需要不止一次获取这个信息,你不应该只是保存你的数据在字典,但也在一个 ILookup
以字典的值作为键,字典的键作为值:
var lookup = MyDict.ToLookup(x => x.Value,x => x.Key).Where(x => x.Count()> 1);
要打印信息,您可以使用以下代码:
foreach(查找中的var项)
{
var keys = item.Aggregate(,(s,v)=& ,+ v);
var message =以下键具有值+ item.Key +:+ keys;
Console.WriteLine(message);
}
What can be the fastest way to to check the duplicate values in the dictionary and print its key?
Dictionary MyDict
which is having following values,
Key Value
22 100
24 200
25 100
26 300
29 200
39 400
41 500
Example: key 22 and 25 have same values and i need to print that 22 and 25 have duplicate values.
It depends. If you have an ever changing dictionary and need to get that information only once, use this:
MyDict.GroupBy(x => x.Value).Where(x => x.Count() > 1)
However, if you have a dictionary that is more or less static and need to get this information more than once, you should not just save your data in a Dictionary but also in a ILookup
with the value of the dictionary as the key and the key of the dictionary as the value:
var lookup = MyDict.ToLookup(x => x.Value, x => x.Key).Where(x => x.Count() > 1);
To print the info, you can use the following code:
foreach(var item in lookup)
{
var keys = item.Aggregate("", (s, v) => s+", "+v);
var message = "The following keys have the value " + item.Key + ":" + keys;
Console.WriteLine(message);
}
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