C#Aggregate()方法
该Aggregate()方法在序列上应用累加器功能。
以下是我们的数组-
string[] arr = { "DemoOne", "DemoTwo", "DemoThree", "DemoFour"};现在使用该Aggregate()方法。为了进行比较，我们将ssed值设置为“DemoFive”。
string res = arr.AsQueryable().Aggregate("DemoFive", (longest, next) => next.Length > longest.Length ? next : longest,str => str.ToLower());在此，结果字符串应具有比初始种子值（即“DemoFive”）更多的字符数。
示例
using System;
using System.Linq;
class Demo {
static void Main() {
string[] arr = { "DemoOne", "DemoTwo", "DemoThree", "DemoFour"};
string res = arr.AsQueryable().Aggregate("DemoFive", (longest, next) => next.Length > longest.Length ? next : longest,str => str.ToLower());
Console.WriteLine("The string with more number of characters: {0}", res);
}
}输出结果
The string with more number of characters: demothree