更改txt文件中的行

本文关键字：文件 txt 更改 | 更新日期: 2023-09-27 18:21:42

C#的新功能

是否可以使用c#更改txt文件中的文本？

我想打开一个包含以下内容的文本文件：

8881
8882
8883
8884
8885

将它们放在一个数组中，将行更改为：

'8881',
'8882',
'8883',
'8884',
'8885',

然后用修改后的行写出一个新的txt文件。

string[] lines = System.IO.File.ReadAllLines(@"C:'Users'Public'TestFolder'WriteLines2.txt");
//Foreach that lists all lines
System.Console.WriteLine("WriteLines2.txt contains following lines = ");
foreach (string line in lines)
{         
    Console.WriteLine(line);
}

我是如何改变每一行并将它们写在一个新的txt中的？

更改txt文件中的行

您可以使用以下简单的LINQ查询和File.WriteAllLines:

var newLines = from line in System.IO.File.ReadAllLines(filePath)
               select String.Format("'{0}',", line);
System.IO.File.WriteAllLines(filePath, newLines);

您可以用新行覆盖同一个文件。

String path = @"C:'Users'Public'TestFolder'WriteLines2.txt";
String[] lines = System.IO.File.ReadAllLines(path);
//I'm using System.Linq to change the lines. I'm adding a "'" before and after the original token.
String[] changedLines = lines.Select(x => string.Format("'{0}',", x)).ToArray();
// I'm saving the changes to the file.
System.IO.File.WriteAllLines(path, changedLines);

你也可以在没有System.Linq的情况下完成

string[] path = @"C:'Users'Public'TestFolder'WriteLines2.txt";
string[] lines = System.IO.File.ReadAllLines(path);
// change every line
for (int index = 0; index < lines.Length; ++index)
{         
    lines[index] = string.Format("'{0}',", lines[index]);
}
System.IO.File.WriteAllLines(path, lines);

您可以使用linq 尝试

//read the fine and alter it by Select Function 
        var lines = File.ReadAllLines("file.txt").Select(item =>  string.Format("'{0}',",item)).ToArray();
    //write the lines to disk
    File.WriteAllLines("file02.txt",lines);

试试这个-

var file = File.ReadLines("path");
var sb = new StringBuilder();
foreach (var t in file)
{
   if(!string.IsNullOrWhiteSpace(t))
        sb.AppendLine("'" + t + "',");
}
File.WriteAllLines("path", new string[] { sb.ToString() });

var linesModified = lines.Select (l => string.Format(@"'{0}',",l));
File.WriteAllLines(@"C:'Users'Public'TestFolder'WriteLines2_Out.txt", linesModified);

编辑：使用流媒体而不是将整个文件（可能是一个大文件）加载到内存的高效版本：

void Main()
{
  string inFileName = @"C:'Users'Public'TestFolder'WriteLines2.txt";
  string outFileName = @"C:'Users'Public'TestFolder'WriteLines2_Out.txt";
  using(var r = File.OpenText(inFileName))
  using(var w = File.CreateText(outFileName))
  {
    string line;
    while ( (line = r.ReadLine()) != null)
    {
        w.WriteLine(string.Format(@"'{0}',",line));
    }
  }
}
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