C#从字符串中的特定行号读取文本 [英] C# read text from a certain line number from string

问题描述

让我说我有一个包含两行的字符串

[] =新行，如enviermentail行，它不是字符串的一部分，而是字符串集合的一个示例

lets say i got a string which has 2 lines in it

[] = the new line like enviermentail line and it not part of the string but is an example of collection of strings

StringCollection text = "That [] Hat";

因此您可以看到有2行，"That"在第1行，"Hat"在第2行

我希望能够阅读第2行，例如

so as you can see there are 2 lines, "That" is on line 1 and "Hat" is on line 2

I want to be able to read line 2, for example

this.text = text.line2.tostring();

和text.line2.tostring();将是帽子"

所以我想知道是否有人可以帮助我实现这一目标?

and text.line2.tostring(); will be "Hat"

so i was wondering if some one can help me achieve this goal?

推荐答案

尝试类似的方法.

try something like this.

static void Main(string[] args)
       {
           StringCollection TEXT = new StringCollection();
           TEXT.Add("That");
           TEXT.Add(Environment.NewLine);
           TEXT.Add("Hat");
           TEXT.Add(Environment.NewLine);
           TEXT.Add("Hat2");
           int i = 0;
           foreach (string str in TEXT)
           {
               if (str==Environment.NewLine)
                   i=i+1;
               else if(i==2)
                   Console.WriteLine(str);
           }
           Console.Read();
       }

在这里i == 2表示我想要第二行.它将返回我Hat2
如果我给i == 1，它将给我第一行.它将返回我帽子

here i==2 means i want 2nd line..it will return me Hat2
if i give i==1 it will give me 1st line..it will return me Hat

string GetLine(string text, int lineNo) 
{ 
  string[] lines = text.Replace("\r","").Split('\n'); 
  return lines.Length >= lineNo ? lines[lineNo-1] : null; 
} 

您的问题有点不清楚:
-您的[]似乎不是真实的，而对于\n等，是正确的(请参见下文)?
-线是否需要去除开头和结尾的空白?
-是否需要处理\r\n，\n\r，\r，\n?

BTW:请参见以C#进行转义:字符，字符串，字符串格式，关键字，标识符 [ ^ ]用于在字符串中进行转义.

解决方案可能是:

Your question is a bit unclear:
- your [] seems not to be real, but rather for \n, etc, correct (see below)?
- do the lines need to have stripped off the leading and trailing white spaces?
- does it need to handle \r\n, \n\r, \r, \n?

BTW: See Escaping in C#: characters, strings, string formats, keywords, identifiers[^] for escapes in a string.

A solution may be:

// split at new lines, remove empty lines, remove leading and trailing white spaces
public static string[] GetLines(string fullText)
{
    return fullText.Split(new[] {'\n'}, StringSplitOptions.RemoveEmptyEntries)
                   .Select(line => line.Trim())
                   .ToArray();
}

干杯
安迪

Cheers
Andi

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