C# DataTable列值分组和排序

DataTable的列A包含3种类型的内容：

数字的

字母数字

字母表

数据表的

列B

包含日期格式“YYYYMMDD”

我需要根据3种内容类型对数据进行分组，然后按日期升序排序

例如：

ColumnA | ColumnB A123457 | 20171114 B246734 | 20171009 1234544 | 20170808 6789033 | 20171220 ABBCDEE | 20180102 A112233 | 20160202 1212122 | 20171115 NNNNNNN | 20171011

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我们将为此提供什么样的LINQ解决方案

下面不是确切的代码，通过下面的方法您可以达到预期的结果

//sort the date and put into same list
CultureInfo provider = CultureInfo.InvariantCulture;
                    myList.ForEach(i => { i.ColumnB = DateTime.ParseExact(i.ColumnB, "YYYYMMDD", provider);});

//check for regex match and add to list
                    mynumericlist = myList.Where(x => Regex.IsMatch(x.columnA, @"^\d$")).ToList().OrderBy(x=>x.ColumnB);
                    myalphalist = myList.Where(x => Regex.IsMatch(x.columnA, @"^[a-zA-Z]*$")).ToList().OrderBy(x => x.ColumnB);
                    myalpnumlist = myList.Where(x => Regex.IsMatch(x.columnA, @"^[a-zA-Z0-9]*$")).ToList().OrderBy(x => x.ColumnB);

                    //then combine all

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这里的答案是否有帮助：@jason.kaisersmith，谢谢你指出，但这个要求有点不同。

//sort the date and put into same list
CultureInfo provider = CultureInfo.InvariantCulture;
                    myList.ForEach(i => { i.ColumnB = DateTime.ParseExact(i.ColumnB, "YYYYMMDD", provider);});

//check for regex match and add to list
                    mynumericlist = myList.Where(x => Regex.IsMatch(x.columnA, @"^\d$")).ToList().OrderBy(x=>x.ColumnB);
                    myalphalist = myList.Where(x => Regex.IsMatch(x.columnA, @"^[a-zA-Z]*$")).ToList().OrderBy(x => x.ColumnB);
                    myalpnumlist = myList.Where(x => Regex.IsMatch(x.columnA, @"^[a-zA-Z0-9]*$")).ToList().OrderBy(x => x.ColumnB);

                    //then combine all