如何在文本文件中添加标题 [英] How to prepend a header in a text file

问题描述

如何在文本文件中的现有数据的开头添加/附加文本.基本上我需要在文本文件中的这些数据之前提供一个标题.这个头是一个动态数据.请注意，此数据来自外部源或 SQL 包或来自某个地方.因此，在文本文件中获取数据后，我想在文本文件的现有条目/数据中提供一个用逗号分隔的标题文本.

How to prepend/append text beginning of the existing data in a text file. Basically i need to provide a header before this data in a text file. This header is a dynamic data. Please note this data is coming from external source or SQL package or from somewhere. So After getting data in a text file then i want to provide a header text with comma separated in the existing entries/data of a text file.

我在文本文件中的示例数据如下:

I've sample data in a text file as below:

123,"SAV","CBS123",2010-10-10 00:00:00
456,"CUR","CBS456",2012-02-01 00:00:00

要添加的标题文本:

HDR<TableName><DateTime>

我需要的输出如下:表名:帐户日期时间:2012-05-09 12:52:00

Output i need as below: TableName: Account DateTime: 2012-05-09 12:52:00

HDRAccount2012-05-09 12:52:00
123,"SAV","CBS123",2010-10-10 00:00:00
456,"CUR","CBS456",2012-02-01 00:00:00

请帮助我如何在两种语言中获得相同的 VB6.0、C#.NET

Please help me how to get the same in both languages VB6.0, C#.NET

推荐答案

请注意，从技术上讲，您不能插入"到文件中并让所有内容向下移动".您能做的最好的事情是读取文件并用新行重写它.这是一种有效的方法:

Note that you can't technically 'insert' into a file and have all contents 'shift' down. Best you can do is read the file and rewrite it with a new line. Here's one way to do it efficiently:

static void InsertHeader(string filename, string header)
{
    var tempfile = Path.GetTempFileName();
    using (var writer = new StreamWriter(tempfile))
    using (var reader = new StreamReader(filename))
    {
        writer.WriteLine(header);
        while (!reader.EndOfStream)
            writer.WriteLine(reader.ReadLine());
    }
    File.Copy(tempfile, filename, true);
    File.Delete(tempfile);
}

感谢这个答案这个想法但改进到足以让它值得单独发布.

Credits to this answer for the idea but improved enough to make it worth posting separately.

现在，如果您想要接受表名和日期时间的东西，只需将其添加为第二个函数:

Now if you want something that accepts the table name and date time, just add this as a second function:

static void InsertTableHeader(string filename, string tableName, DateTime dateTime)
{
    InsertHeader(filename, 
                 String.Format("HDR{0}{1:yyyy-MM-dd HH:MM:ss}", 
                 tableName, 
                 dateTime));
}

因此，只需根据需要调用 InsertHeader(filename, "Account", DateTime.Now) 或类似方法.

So just call InsertHeader(filename, "Account", DateTime.Now) or similar as needed.

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