如何在文本文件中逐行读取和替换字符串? [英] How can I read and replace Strings line by line in a Text File?

问题描述

我有一个读取此内容的文本文件:

I have a text file that reads this:

INSERT INTO `shops` VALUES ('', '3', '1000000', '0');
INSERT INTO `shops` VALUES ('', '3', '1000010', '0');
INSERT INTO `shops` VALUES ('', '3', '1000020', '0');
INSERT INTO `shops` VALUES ('', '3', '1000030', '0');
INSERT INTO `shops` VALUES ('', '3', '1001000', '0');

请注意，每行的第一个键是".对于每一行，我想找到''，然后将其替换为数字(以1开头)，然后在转到下一行时将其添加1，就像这样:

Notice for each line the first key is ''. For each line, I want to find that '', and replace it with a number (starting with 1), then add 1 to it as it goes to the next line, Like so:

INSERT INTO `shops` VALUES ('1', '3', '1000000', '0');
INSERT INTO `shops` VALUES ('2', '3', '1000010', '0');
INSERT INTO `shops` VALUES ('3', '3', '1000020', '0');
INSERT INTO `shops` VALUES ('4', '3', '1000030', '0');
INSERT INTO `shops` VALUES ('5', '3', '1001000', '0');

我已经尝试了几个小时，但是失败了.

I've been trying to do this for a couple of hours but I'm failing.

这就是我一直在想的(我知道这很不正确，但是我在C#中并不那么精明，所以也许你们中的一个可以帮助我提出正确的代码):

Here is what I've been thinking of (I know this is far from right, but I'm not that savvy in c#, so maybe one of you can help me come up with the right code):

string text = File.ReadAllText("C:\\Users\\Donavon\\Desktop\\old.sql");

int i = 0;
text = text.Replace("('',", "('" + i + "',");
i++;
File.WriteAllText("C:\\Users\\Donavon\\Desktop\\new.sql", text);

感谢您的帮助，非常感谢

Thanks for any help, It's greatly appreciated

推荐答案

您可以逐行阅读以下行:

You can read the lines in individually:

string text = "";
using (StreamReader sr = new StreamReader("C:\\Users\\Donavon\\Desktop\\old.sql"))
{
    int i = 0;
    do
    {
        i++;
        string line = sr.ReadLine();
        if (line != "")
        {
            line = line.Replace("('',", "('" + i + "',");
            text = text + line + Environment.NewLine;
        }
    } while (sr.EndOfStream == false);
}
File.WriteAllText("C:\\Users\\Donavon\\Desktop\\new.sql", text);

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