Question

我正在阅读一个文本文件并选择某些关键字并为其添加字符串，然后将其写入另一个空文本文档。我的问题是，因为我对多个字符串执行此操作，所以它会多次写入文本文件，最后为原始文本文档中的每一行添加5行。有人知道我可以使用另一种方法来完成这项工作吗？

var fileContents = System.IO.File.ReadAllLines(textBox5.Text);
        var outFileContents = new List<string>();
        foreach (var line in fileContents)
        {

            if (line.Contains("Start **** Connect Process"))  //Text to find 
                outFileContents.Add(line + "," + Environment.NewLine + "*****" + Environment.NewLine); //Add your text
            else
                outFileContents.Add(line + ","); //Keep column

            if (line.Contains("Start $$$$$$ Connect Process"))
                outFileContents.Add(line + "," + Environment.NewLine + "$$$$$$" + Environment.NewLine);
            else
                outFileContents.Add(line + ",");
            if (line.Contains("Fail to send &&&&&&&&"))
                outFileContents.Add(line + "," + Environment.NewLine + "&&&&&&" + Environment.NewLine);
            else
                outFileContents.Add(line + ",");

            if (line.Contains("Start @@@@@ Process"))
                outFileContents.Add(line + "," + Environment.NewLine + "@@@@@@" + Environment.NewLine);
            else
                outFileContents.Add(line + ",");
            if (line.Contains("ConnectionStatus: ######"))
                outFileContents.Add(line + "," + Environment.NewLine + "######" + Environment.NewLine);
            else
                outFileContents.Add(line + ",");

            System.IO.File.WriteAllLines(textBox6.Text, outFileContents);
        }



        Process.Start(textBox6.Text);

    }

Answer 1

问题不在于你是在循环中调用WriteAllLines。 WriteAllLines 会覆盖文件。只需看the documentation。

问题是你要将每一行添加到输出列表五次。

你拥有的基本上是：

for every line
    if ()
        add modified line
    else
        add unmodified line

    if ()
        add modified line
    else
        add unmodified line

其中五个条件意味着将五个副本添加到输出列表中。

您需要在临时缓冲区中构建字符串，并将其添加到列表中一次。类似的东西：

for(...)
{
    StringBuilder sb = new StringBuilder(line);

    if (line.Contains("Start **** Connect Process"))
        sb.Append("," + Environment.NewLine + "*****" + Environment.NewLine);
    else
        sb.Append(',');

    // do that for each of your conditionals.

    // and finally, add the line to the output buffer:
    outFileContents.Add(sb.ToString());
}

现在，您应该将WriteAllLines移出循环，这样您就不会每次都重写文件。所以你的代码变成了：

for (....)
{
    // do stuff
}
File.WriteAllLines(...)

Answer 2

从foreach中获取此System.IO.File.WriteAllLines(textBox6.Text, outFileContents);

 var fileContents = System.IO.File.ReadAllLines(textBox5.Text);
            var outFileContents = new List<string>();
            foreach (var line in fileContents)
            {




            }
     System.IO.File.WriteAllLines(textBox6.Text, outFileContents);


            Process.Start(textBox6.Text);

        }

Answer 3

原因是因为你一遍又一遍地写文字（它在一个循环中）。相反，您需要通过移动WriteAllLines方法调用在操作结束时只写一次该文件。

此外，您可能需要考虑使用StringBuilder类来生成内容。

var fileContents = System.IO.File.ReadAllLines(textBox5.Text);
    var outFileContents = new List<string>();
    foreach (var line in fileContents)
    {

        if (line.Contains("Start **** Connect Process"))  //Text to find 
            outFileContents.Add(line + "," + Environment.NewLine + "*****" + Environment.NewLine); //Add your text
        else
            outFileContents.Add(line + ","); //Keep column

        if (line.Contains("Start $$$$$$ Connect Process"))
            outFileContents.Add(line + "," + Environment.NewLine + "$$$$$$" + Environment.NewLine);
        else
            outFileContents.Add(line + ",");
        if (line.Contains("Fail to send &&&&&&&&"))
            outFileContents.Add(line + "," + Environment.NewLine + "&&&&&&" + Environment.NewLine);
        else
            outFileContents.Add(line + ",");

        if (line.Contains("Start @@@@@ Process"))
            outFileContents.Add(line + "," + Environment.NewLine + "@@@@@@" + Environment.NewLine);
        else
            outFileContents.Add(line + ",");
        if (line.Contains("ConnectionStatus: ######"))
            outFileContents.Add(line + "," + Environment.NewLine + "######" + Environment.NewLine);
        else
            outFileContents.Add(line + ",");
    }

    System.IO.File.WriteAllLines(textBox6.Text, outFileContents);

    Process.Start(textBox6.Text);

将字符串添加到文本文档中某些行的末尾，并写入C＃中的空文本doc

3 个答案: