c# - 从文本文件中删除特定行？

Question

我需要从文本文件中删除确切的一行，但我一辈子都弄不明白该怎么做。

如有任何建议或示例，我们将不胜感激？

相关问题

Efficient way to delete a line from a text file (C#)

Answer 1

如果要删除的行是基于该行的内容:

string line = null;
string line_to_delete = "the line i want to delete";

using (StreamReader reader = new StreamReader("C:\\input")) {
    using (StreamWriter writer = new StreamWriter("C:\\output")) {
        while ((line = reader.ReadLine()) != null) {
            if (String.Compare(line, line_to_delete) == 0)
                continue;

            writer.WriteLine(line);
        }
    }
}

或者如果是基于行号:

string line = null;
int line_number = 0;
int line_to_delete = 12;

using (StreamReader reader = new StreamReader("C:\\input")) {
    using (StreamWriter writer = new StreamWriter("C:\\output")) {
        while ((line = reader.ReadLine()) != null) {
            line_number++;

            if (line_number == line_to_delete)
                continue;

            writer.WriteLine(line);
        }
    }
}