删除文本文件中每行第 n 个位置的字符 [英] Delete character at nth position for each line in a text file

问题描述

我在文件夹中有多个文本文件.我需要删除文本文件中每行的第 8 个字符处的字符.文本文件有 100+ 多行

I have multiple text files in folder. I need to delete character at the 8th character of each line in the text files. Text files have 100+ multiple rows

我将如何执行此操作?

原始文件示例:

123456789012345....
abcdefghijklmno....

新文件:

12345679012345
abcdefgijklmno

阅读这篇文章很有帮助:

Reading this article is helpful:

在字符串的每一行添加一个字符

注意:文本行的长度可以是可变的(不确定是否重要 - 一行可以有 20 个字符，下一行可能有 30 个字符，等等.所有文本文件都在文件夹中:C:TestFolder

Note: Length of text lines can be variable (not sure if it matters- one row can have 20 characters, next line may have 30 characters, etc. All text files are in folder: C:TestFolder

类似问题:在每行的第 n 个位置插入字符在文本文件中

推荐答案

您可以使用 File.ReadAllLines() 和 string.Substring() 方法如下:

You can use File.ReadAllLines() and string.Substring() methods as follwing:

string path = @"C:TestFolder";
string charToInsert = " ";
string[] allFiles = Directory.GetFiles(path, "*.txt", SearchOption.TopDirectoryOnly); //Directory.EnumerateFiles
foreach (string file in allFiles)
{
    var sb = new StringBuilder();
    string[] lines = File.ReadAllLines(file); //input file
    foreach (string line in lines)
    {
        sb.AppendLine(line.Length > 8 ? line.Substring(0, 7) + line.Substring(8) : line);
    }
    File.WriteAllText(file, sb.ToString()); //overwrite modified content
}

• line.Substring(0, 7) 表示前 7 个字符(字符 #0 到 #6，长度为 7).
• line.Substring(8) 表示从第 9 个字符到结尾(char #8 到结尾).
• line.Substring(0, 7) means first 7 characters (char #0 to #6 with length of 7).
• line.Substring(8) means from 9'th character to end (char #8 to end).

请注意，字符位置是零索引的！

Note that char positions are zero-indexed!

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