static void Main(string[] args){string[] myWords = new string[] { "what", "is", "your", "name", "my", "name", "is" };var obj = from m in myWordsgroup m by m.Length into lengthgroupsorderby lengthgroups.Keyselect new{length = lengthgroups.Key,wordCollection = lengthgroups};foreach (var item in obj){Console.WriteLine("包含" + item.length + "个字符的单词有：");foreach (string stra in item.wordCollection){Console.WriteLine(stra);}}

 static void Main(string[] args){string[] myWords = new string[] { "what", "is", "your", "name", "my", "name", "is" };var groups = myWords.GroupBy(o => o.Length);foreach (var item in groups){Console.WriteLine("包含" + item.Key + "个字符的单词有：");foreach (string stra in item){Console.WriteLine(stra);}}

 static void Main(string[] args){string[] myWords = new string[] { "what", "is", "your", "name", "my", "name", "is" };var groups = myWords.GroupBy(o => o.Length);foreach (IGrouping<int,string> item in groups){Console.WriteLine("包含" + item.Key + "个字符的单词有：");foreach (string stra in item){Console.WriteLine(stra);}}

string[] myWords = new string[] { "what", "is", "your", "name", "my", "name", "is" };var words = myWords.Select((word, index) => { return new { index, word.Length, word, title = "aaa" }; }).OrderBy(o => o.Length);

 //// 摘要://     通过合并元素的索引将序列的每个元素投影到新表中。//// 参数://   source://     一个值序列，要对该序列调用转换函数。////   selector://     一个应用于每个源元素的转换函数；函数的第二个参数表示源元素的索引。//// 类型参数://   TSource://     source 中的元素的类型。////   TResult://     selector 返回的值的类型。//// 返回结果://     一个 System.Collections.Generic.IEnumerable<T>，其元素为对 source 的每个元素调用转换函数的结果。//// 异常://   System.ArgumentNullException://     source 或 selector 为 null。public static IEnumerable<TResult> Select<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, int, TResult> selector);//// 摘要://     将序列中的每个元素投影到新表中。//// 参数://   source://     一个值序列，要对该序列调用转换函数。////   selector://     应用于每个元素的转换函数。//// 类型参数://   TSource://     source 中的元素的类型。////   TResult://     selector 返回的值的类型。//// 返回结果://     一个 System.Collections.Generic.IEnumerable<T>，其元素为对 source 的每个元素调用转换函数的结果。//// 异常://   System.ArgumentNullException://     source 或 selector 为 null。public static IEnumerable<TResult> Select<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector);