LIST排序去重转数组转字符串(字符串转数组转list)

 List<string> li1 = new List<string> { "8", "8", "9", "9", "0", "9" };               string unit = "12,18,19,55,99";             //List<string> li2 = new List<string> { "张三", "张三", "李四", "张三", "王五", "

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