Question

我的文字文件如下所示

mytext.txt

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

现在我想使用c＃读取mytext.txt然后替换这样的行并将其保存到文本文件中。

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

Answer 1

我会给你代码，但解释每个步骤的作用，以便你可以从中学习：

// 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);
}

从文本文件中读取数字并替换为其他内容

1 个答案: