Question

我有一个文本文件，其中特定字符在每几行之后在行的开头重复。没有。两者之间的线不固定。我能够找出出现这种情况的那些线。我想阅读其中的那些内容。

 using (StreamReader sr = new StreamReader(@"text file"))
 {
     string line;
     while ((line = sr.ReadLine()) != null)
     {
         if (line.StartsWith("some character"))

因为下次出现此字符时，代码保持不变。我无法在

之间阅读这些内容

例如。

Condition at the begining of a line
Next line
Next line
Condition at the begining of a line
Next Line
Next Line
Next Line
Next Line
Condition at the begining of a line

我必须阅读两者之间的界限。每次条件都保持不变。感谢。

Answer 1

您似乎只需跳过符合特定条件的行。

var lines = System.IO.File.ReadLines(@"text file")
            .Where (line => ! line.StartsWith("Condition");

foreach(string line in lines)
{
  // do your stuff
}

Answer 2

我假设您要解析文本文件并在每次条件之间处理所有文本块。

基本上你读取每一行，检查第一个条件，它指示“块”的开始并继续读取行，直到找到另一个条件，这表示块的结束（和另一个的开始）。

洗涤，冲洗，重复。

一个简单的例子：

using (var reader = new StreamReader(@"test.txt"))
{
    var textInBetween = new List<string>();

    bool startTagFound = false;

    while (!reader.EndOfStream)
    {
        var line = reader.ReadLine();
        if (String.IsNullOrEmpty(line))
            continue;

        if (!startTagFound)
        {
            startTagFound = line.StartsWith("Condition");
            continue;
        }

        bool endTagFound = line.StartsWith("Condition");
        if (endTagFound)
        {
            // Do stuff with the text you've read in between here
            // ...

            textInBetween.Clear();
            continue;
        }

        textInBetween.Add(line);
    }
}

Answer 3

如果我理解正确，你想在“块内外”的条件之间切换：

{
  string line;
  int inside = 0;
  while ((line = sr.ReadLine()) != null)
  {
     if (line.StartsWith("some character"))
     {
         inside = !inside;
         // If you want to process the control line, do it here.
         continue;
     }
     if (inside)
     {
         // "line" is inside the block. The line starting with "some character"
         // is never here.
     }
     else
     {
         // Well, line is outside. And the control lines aren't here either.
     }
  }
}

Answer 4

这是我经常使用的方法，用于读取对于XDocument来说太大的xml文件。根据您的需要修改它会非常容易。

public static void ReadThroghFile(string filePath, int beingLinesToSkip, string endingMarker, Action<string> action)
{
   using (var feed = new StreamReader(filePath))
   {
       var currentLine = String.Empty;
       var ongoingStringFromFeed = String.Empty;

       for (var i = 0; i < beingLinesToSkip; i++) feed.ReadLine(); 

       while ((currentLine = feed.ReadLine()) != null)
       {
           ongoingStringFromFeed += currentLine.Trim();
           if (!currentLine.Contains(endingMarker)) continue;

           action(ongoingStringFromFeed);
           ongoingStringFromFeed = String.Empty;
       }
    }
}

Answer 5

除非我遗漏了某些内容，否则您似乎 从StreamReader中读取“每一行” 并检查您的“条件”是否满足。所以我不明白你的问题“我想在两者之间阅读这些内容。”!!!!

Answer 6

你能不能做你想做的事吗？

using (StreamReader sr = new StreamReader(@"text file"))
{
 string line;
 while ((line = sr.ReadLine()) != null)
 {
     if (line.StartsWith("some character"))
     {
        //Get rid of line
     }
     else
     {
       // Do stuff with the lines you want
     }

阅读文本文件块

6 个答案: