查找密钥索引?字典.NET [英] Find index of a key? Dictionary .NET

问题描述

我需要做currentKey + 1.因此，我想找到键值的索引并获取下一个键(如果最后是第一个键).如何找到密钥的当前索引?

I need to do currentKey+1. So i would like to find the index of the key value and get the next key (or first if at end). How do i find the current index of the key?

我正在使用Dictionary<int, classname>，并且我使用Linq寻找.Find或IndexOf无济于事.

I am using a Dictionary<int, classname> and i looked for .Find or IndexOf with Linq to no avail.

推荐答案

字典未排序，因此Key确实没有任何索引.在这里看到我的问题:访问字典.键通过数字索引键

Dictionaries are not sorted, so the Key doesn't have any index really. See my question here: Accessing a Dictionary.Keys Key through a numeric index

使用 OrderedDictionary 带有Int的索引器.

'我不确定我了解您想要什么.如果您想遍历字典，只需使用

'm not really sure I understand what you want. If you want to iterate through a Dictionary, just use

foreach(KeyValuePair kvp in yourDict)

如果键是一个Int，而您想要下一个，请使用

If the key is an Int and you want the next, use

var newkey = oldkey+1;
if(yourdict.ContainsKey(newkey)){
    var newvalue = yourdict[newkey];
}

如果整数不是连续的，则可以使用

If the ints are not sequential, you can use

var upperBound = d.Max(kvp => kvp.Key)+1; // to prevent infinite loops
while(!yourdict.ContainsKey(newkey) && newkey < upperBound) {
    newkey++;
}

或者，或者:

var keys = (from key in yourdict.Keys orderby key select key).ToList();
// keys is now a list of all keys in ascending order

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