using System; using System.Collections.Generic; using System.Linq; using System.Text; /// /// /// public partial class Utils { } /// /// 扩展下Linq,增加一个取随机值方法. wanggangzero@vip.qq.coms /// public static class LinqExt { static Random r = new Random(Guid.NewGuid().GetHashCode()); // 随机种子 /// /// 从集合中随机取一批数据 /// /// /// /// /// public static IEnumerable Random(this IEnumerable source, int? count = null) { return count.HasValue ? source.OrderBy(_ => r.Next()).Take(count.Value) : source.OrderBy(_ => r.Next()); } /// /// 仿PHP的implode函数 /// /// /// /// public static string Implode(this IEnumerable source, string glue = "") { var sb = new StringBuilder(); var n = source.Count(); int i = 0; source.ToList().ForEach(s => sb.Append((++i < n) ? s + glue : s)); return sb.ToString(); } public static string[] Explode(this string strSource, string seperator = ""){ return strSource.Split(new string[] { seperator }, StringSplitOptions.RemoveEmptyEntries); } }