C#循环替换的问题。代码该怎么写

Question

现有一文本，里面内容大致为10000
10000
10000
10000
想要替换为10001
10002
10003
10004注意，是替换，不是生成。
代码该怎么写啊

Answer 1

            string[] lines = File.ReadAllLines("读取文件路径");
            for (int i=0; i < lines.Length;i++)
            {
                lines[i] = (int.Parse(lines[i]) + i+1).ToString();
                Console.WriteLine(lines[i]);
            }            File.WriteAllLines("写入文件路径",lines);

Answer 2

string pattern_line = @"(?<=\d+?)\d(?=\s|$)";
            string[] text_lines = File.ReadAllLines(@"C:\Users\M\Desktop\Test.txt", Encoding.GetEncoding("GB2312")).Select((a, i) => {
                a = Regex.Replace(a, pattern_line, (i + 1).ToString());
                return a; 
            }).ToArray();//读取并替换
            File.WriteAllLines(@"C:\Users\M\Desktop\Test.txt",text_lines);//写回txt

Answer 3

int counter = 1;
string s = File.ReadAllText((@"c:\test.txt"));
string r = Regex.Replace(s, @"(?m)\d+", delegate(Match match)
{
int value = int.Parse(match.Value) + counter++;
return value.ToString();
});
File.WriteAllText((@"c:\test.txt"), r);

Answer 4

string str = @"@
@
@
@
@
@
@
@
@
@
@
@
@
@
@
";
            str = string.Join("\r\n", str.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries).Select((t, i) => { return (i + 1).ToString(); }).ToArray());

Answer 5

原文
@ghfgh
@sfghsfgh
@sfghfgh
@sfgh
@rtyrty
....只替换原文的@字符为递增的数字
1ghfgh
2sfghsfgh
3sfghfgh
4sfgh
5rtyrty
....

Answer 6

string[] text_lines = File.ReadAllLines(@"C:\Documents and Settings\Administrator\桌面\Test.txt", Encoding.GetEncoding("GB2312")).Select((a, i) =>
        {
            a = a.Replace("@",(i + 1).ToString());
            return a;
        }).ToArray();//读取并替换
        File.WriteAllLines(@"C:\Documents and Settings\Administrator\桌面\Test.txt", text_lines);//写回txt