C# 如何在c中用两列对csv文件进行排序#

我的csv文件有14列和大约800.000行。我必须先按第10列排序，然后按第3列排序。 我使用下面的代码，但只按第10列排序

            string filePath = "D:\\csv.csv";

            string[] lines = File.ReadAllLines(filePath, Encoding.Default);

            var data = lines.Skip(1);
            var sorted = data.Select(line => new
            {
                SortKey = Int32.Parse(line.Split(';')[9]),
                 Line = line

            }
            ).OrderBy(x => x.SortKey).Select(x => x.Line);
            File.WriteAllLines("D:\\sortedCsv.csv", lines.Take(1).Concat(sorted), Encoding.Default);

            var sorted = data.Select(line => new
            {
                SortKey = Int32.Parse(line.Split(';')[9]),
                 Line = line

            }
            ).OrderBy(x => x.SortKey).ThenBy(x => x.Line);

我的csv喜欢

            var sorted = data.Select(line => new
            {
                SortKey = Int32.Parse(line.Split(';')[9]),
                 Line = line

            }
            ).OrderBy(x => x.SortKey).ThenBy(x => x.Line);

• col1；col2；col3；。。。。。。；col10
• abc；fds；123456 ;.... ;123 ; ..
• def；dsa；12435 ; .... 124 ; ..

  ---

您需要在第一次订购后使用thenBy

            var sorted = data.Select(line => new
            {
                SortKey = Int32.Parse(line.Split(';')[9]),
                 Line = line

            }
            ).OrderBy(x => x.SortKey).ThenBy(x => x.Line);

试试这个：

            var sorted = data.Select(line => new
            {
                SortKey = Int32.Parse(line.Split(';')[9]),
                 Line = line

            }
            ).OrderBy(x => x.SortKey).ThenBy(x => x.Line);

var sorted = data.Select(line => new
        {
            SortKey = Int32.Parse(line.Split(';')[9]),
            SortKey2 = line.Split(';')[2],
             Line = line

        }
        ).OrderBy(x => x.SortKey).ThenBy(x=>x.SortKey2).Select(x => x.Line);

---

基本上，添加第二个排序标准，然后按指定的顺序排序。

您必须使用

OrderBy（…）。然后按（…）

：

            var sorted = data.Select(line => new
            {
                SortKey = Int32.Parse(line.Split(';')[9]),
                 Line = line

            }
            ).OrderBy(x => x.SortKey).ThenBy(x => x.Line);

请注意，在这种情况下，

File.ReadLines

比

File.ReadAllLines

更有效

            var sorted = data.Select(line => new
            {
                SortKey = Int32.Parse(line.Split(';')[9]),
                 Line = line

            }
            ).OrderBy(x => x.SortKey).ThenBy(x => x.Line);