獲取從集合

Question

索引值我有一個字符串的集合："Apple", "Mange", "Pineapple"

我想獲得具有最長的長度字的索引。例如，2對應於最長的單詞"Pineapple"。

Answer 1

爲了獲得與名稱最長的水果，這樣做：

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); 

而作爲一個lambda，無特殊原因：

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;