C# Aggregate() 方法
Aggregate() 方法對序列應用累加函式。
以下為我們的陣列 −
string[] arr = { "DemoOne", "DemoTwo", "DemoThree", "DemoFour"};
現在使用 Aggregate() 方法。將 seed 值設定為 “DemoFive” 以進行比較。
string res = arr.AsQueryable().Aggregate("DemoFive", (longest, next) => next.Length > longest.Length ? next : longest,str => str.ToLower());
此處,結果字串應具有比初始 seed 值(即 “DemoFive”)更多的字元數。
範例
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); } }
輸出
The string with more number of characters: demothree
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