获取从集合

Question

索引值我有一个字符串的集合："Apple", "Mange", "Pineapple"

我想获得具有最长的长度字的索引。例如，2对应于最长的单词"Pineapple"。

Answer 1

为了获得与名称最长的水果，这样做：

var fruits = new List<String> { "Apple", "Mange", "Pineapple" }; 
var longestName = (from fruit in fruits 
        orderby fruit.Length descending 
        select fruit).First(); 
var index = fruits.IndexOf(longestName); 

而作为一个lambda，无特殊原因：

var fruits = new List<String> { "Apple", "Mange", "Pineapple" }; 
var longestName = fruits.OrderByDescending(e => e.Length).First(); 
var index = fruits.IndexOf(longestName); 

Answer 2

下可以工作了：

var maxItem = fruits 
    .Select((fruit, index) => new { Length = fruit.Length, Index = index }) 
    .Aggregate((max, next) => (next.Length > max.Length) ? next : max); 
var maxIndex = maxItem.Index;