| 1234567891011121314151617 | using System.Text;namespace Core.Util.Extension{    public static class StringBuilderExtension    {        /// <summary>追加分隔符字符串,忽略开头,常用于拼接</summary>        public static StringBuilder Separate(this StringBuilder sb, string separator)        {            if (sb == null || separator.IsNullOrEmpty()) return sb;            if (sb.Length > 0) sb.Append(separator);            return sb;        }    }}
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