从文本文件中读取数字，并将其替换为其他内容

本文关键字：替换 其他 文件 文本 读取 数字 | 更新日期: 2023-09-27 18:05:38

我的文本文件是这样的

mytext.txt 

1. This is line one
2. This is line two
3. This is line three
.....

现在我想用c#读取mytext.txt，然后像这样替换这些行，并将其保存到一个文本文件中。

Number. This is line one
Number. This is line two
Number. This is line three
.....

从文本文件中读取数字，并将其替换为其他内容

我将给出代码，但解释每一步的作用，以便您可以从中学习:

// assume that System.IO is included (in a using statement)
// reads the file, changes all leading integers to "Number", and writes the changes
void rewriteNumbers(string file)
{
    // get the lines from the file
    string[] lines = File.ReadAllLines(file);
    // for each line, do:
    for (int i = 0; i < lines.Length; i++)
    {
        // trim all number characters from the beginning of the line, and
        // write "Number" to the beginning
        lines[i] = "Number" + lines[i].TrimStart('0', '1', '2', '3', '4', '5', '6', '7', '8', '9');
    }
    // write the changes back to the file
    File.WriteAllLines(file, lines);
}
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