var array=new string[]{"1-5","1-3","1-4","1-1","1-2","5-5","5-3","5-4","5-1","5-2","4-5","4-3","4-4","4-1","4-2","3-5","3-3","3-4","3-1","3-2","2-5","2-3","2-4","2-1","2-2"};
    var result=array.GroupBy(s=>Regex.Match(s,"\\d+(?=-)").Value).OrderBy(g=>int.Parse(g.Key));
    DataTable dt=new  DataTable();
    result.Select(g=>g.Key).ToList().ForEach(k=>dt.Columns.Add("clumns"+k));
    result.ToList().ForEach(r=>dt.Rows.Add(r.ToArray()));

------解决方案--------------------

探讨


前辈，regex是什么东西啊？报错了啊，不存在regex
无法从用法中推导出方法“System.Linq.Enumerable.Select<TSource,TResult>(System.Collections.Generic.IEnumerable<TSource>, System.Func<TSource,TResult>)”的类型实参。请尝试显式指定类型实参。
引用 1 楼 q107……