Question

我有一个文本文件，如＆＃34; ddd，aaa，bb，cccc，3＆＃34;。这个文字有一百万行。我把所有的字都放在数组中。例如

value1=ddd, value2=aaa , value3=bbb , value4=cccc, value5=3`.

它应该是不同的算法，但这并不重要。

当读取此文本时，它取最后一个数字3并重复第一个记录三次，因为最后一个数字是3.如果最后一个数字应该是4，那么它将重复四次。它给出了新的行号

1,aa,bb,ccc,ddd,3
2,aa,bb,ccc,ddd,3
3,aa,bb,ccc,ddd,3

现在我想要，当这个行数等于10000时，它必须写新文本。例如，如果我的阅读文本有50000条记录，则必须写入5.文本文件。我怎样才能做到这一点。你能帮帮我吗？

这是写方法。

public void Save()
{
    value1.Remove("SE");
    value2.Remove("CS");
    value3.Remove("NAME");
    value4.Remove("SURNAME");
    value5.Remove("Number");

    int rowNum = 1;
    int maxNum = 1000;
    String aa = "";
    String TMPvalue;

         for (int d = 0; d < value5.Count; d++) 
         {      
             for (int m = 0; m < (Int32)value5[d]; m++,rowNum++)
             {
                 TMPvalue = rowNum + "," + value1[d] + "," + value2[d] + "," + value3[d] + "," + value4[d] + "," + "TEB";
                 aa = aa + TMPvalue + "\n";

                 if(rowNum==maxNum){
                    path = path + Convert.ToString(xnum) + ".txt";
                    file1 = new System.IO.StreamWriter(path);
                    aa = "ROWNUM,v1,v2,v3,v4" + "\n\r" + aa;
                    string[] lines = aa.Split('\n');
                    foreach (string s in lines)
                    {
                        file1.WriteLine(s);
                    }
                    file1.close();
                    rowNum=1;
                    aa = "";
                 }
             }
         }

         file2 = new System.IO.StreamWriter(path);
         aa = "ROWNUM,v1,v2,v3,v4" + "\n\r" + aa;
         string[] lines = aa.Split('\n');
         foreach (string s in lines)
         {
             file2.WriteLine(s);
         }
         file2.close()
  }

Answer 1

您可以使用以下LINQ查询，该查询可以执行您想要的操作：

var lines10kGroups = File.ReadLines(@"C:\Temp\File.txt")
    .Select(l => new { Line = l, Fields = l.Split(',') })
    .Where(x => x.Fields.Length > 1)
    .Select(x => new{ LastToken = x.Fields.Last().Trim().Split('=').Last(), x.Fields, x.Line})
    .Where(x => x.LastToken.All(Char.IsDigit))  // checks if all characters are digits, pre-check for int.Parse
    .Select(x => new { Count = int.Parse(x.LastToken), x.Line, x.Fields })
    .SelectMany(x => Enumerable.Repeat(x.Line, x.Count)) // this repeats count-lines
    .Select((line, index) => new{ line, index })
    .GroupBy(x => x.index / 10000); // integer division trick to group by 10k lines

string targetDir = @"C:\Temp\TestDirectory";
Directory.CreateDirectory(targetDir);
int fileNum = 0;
foreach (var lineGroup in lines10kGroups)
{ 
    string path = Path.Combine(targetDir, string.Format("File_{0}.txt", ++fileNum));
    while(File.Exists(path))
        path = Path.Combine(targetDir, string.Format("File_{0}.txt", ++fileNum));
    File.WriteAllLines(path, lineGroup.Select(x => x.line));
}

如何从一个文本中写入多个文本文件

1 个答案: