读取文本文件并检查列数对于所有行都是相同的

Question

我有一个包含 n 行的 txt 文件，每行有 n 列和一个分隔符。

如何逐行读取该 txt 文件并检查所有行是否具有相同的列。如果任何行有额外的列，则用文本显示行号。

假设我的 txt 文件中有以下行

147789-00,67,KB08,2007,12,0.000 ,0.000 ,0.000

A22951,67,RN3W,2007,12,0.000 ,0.000 ,0.000

946106-00,67,RN1W,2007,12,0.000 ,0.000 ,0.000,000

A22951,67,RN3W,2007,12,0.000 ,0.000 ,0.000

4 行中的第 3 行有额外的列，同样的方式可能有一些行可以有额外的列。我想找到的额外列。或者我可以说，如果任何行有额外的分隔符，那么它将显示带有文本的行号。

foreach (string line in File.ReadLines(@"c:\file.txt", Encoding.UTF8))
{
       // how to match the columns    
}

我走的路对吗..请有人帮助我。

Answer 1

System.IO.StreamReader file = new System.IO.StreamReader("c:\file.txt");
while((line = file.ReadLine()) != null)
{

}

现在，您可以使用任何分隔符拆分您的行。

Answer 2

char delimiter = ','; // This can be modified 
int numberOfCols = 6; // this will be the number of columns per row

var lines = File
  .ReadLines("Path here")
  .Where(l => l.Split(delimiter).Count() == numberOfCols);

这将为您提供一个集合，其中包含具有指定列数的行；要收集无效行，您可以使用以下命令：

var invalidLines = File
    .ReadLines("Path here")
    .Select((l, lineNumber) => new { key = lineNumber, value = l })
    .Where(l => l.value.Split(delimiter).Count() != numberOfCols);

Answer 3

如果您不知道实际的列数，但想确保这个未知数对于所有行都是相同的：

  char delimiter = ',';
  int columnCount = -1; // or put the number if it's known

  var errors = File
    .ReadLines(@"c:\file.txt", Encoding.UTF8) // UTF-8 is default and can be skipped
    .Select((line, index) => {
      int count = line.Split(delimiter).Length;

      if (columnCount < 0)
        columnCount = count;

      return new {
        line = line,
        count = count,
        index = index
      };
    })
    .Where(chunk => chunk.count != columnCount)
    .Select(chunk => String.Format("Line #{0} \"{1}\" has {2} items when {3} expected",
       chunk.index + 1, chunk.line, chunk.count, columnCount));

 // To check if file has any wrong lines:
 if (errors.Any()) {
   ...
 }

 // To print out a report on wrong lines
 Console.Write(String.Join(Envrironment.NewLine, errors));

读取文本文件并检查列数对于所有行都是相同的

Reading text file and checking column count is the same for all rows

c#

file

winforms

readfile