在一个文本文件中的特定位置添加一个新行。 [英] Add a new line at a specific position in a text file.

问题描述

我想添加文本的特定行的文件。 。特别是两个边界之间

I am trying to add a specific line of text in a file. Specifically between two boundaries.

它会是什么样子，如果我想在加item1的边界之间的一条线的一个例子：

An example of what it would look like if I wanted to add a line in between the boundaries of item1:

[item1]
2550 coins 995 200000 7
2550 coins 995 200000 7
2550 coins 995 200000 7
2550 coins 995 200000 7
2550 coins 995 200000 7
//Add a line here in between the specific boundaries
[/item1]
[item2]
2550 coins 995 200000 7
2550 coins 995 200000 7
2550 coins 995 200000 8
2550 coins 995 200000 7
2550 coins 995 200000 7
[/item2]
[item3]
2550 coins 995 200000 7
2550 coins 995 200000 7
2550 coins 995 200000 7
2550 coins 995 200000 7
2550 coins 995 200000 7
[/item3]

这是我到目前为止已经试过，但它远不正确。它口口声声说该文件正在使用的读卡器，因此不能由作家进行编辑，当我没有得到它的工作，它清除了整个文档。

This is what I have tried so far, however Its nowhere near correct. It keeps saying that the file is being used by the reader so it cant be edited by the writer, when I did get it to work it cleared the entire document.

public void createEntry(String npcName)
{
    String line;
    String fileName = "Drops.de";
    StreamWriter streamWriter = new StreamWriter(fileName);
    StreamReader streamReader = new StreamReader(fileName);
    line = streamReader.ReadLine();
    if (line == ("[" + npcName + "]"))
    {
        streamReader.ReadLine();
        streamWriter.WriteLine("Test");
    }
}

我也想知道怎么写的行该文件的结尾。

I would also like to know how to write lines at the end of the document.

推荐答案

这将增加您想要的位置就行了。 （请确保您有使用System.IO; 添加）

This will add the line where you want it. (Make sure you have using System.IO; added)

public void createEntry(String npcName)
{
    //npcName = @"[/item1]"; <-- note the '/'.
    string lineToAdd = "//Add a line here in between the specific boundaries";
    string fileName = "test.txt";
    List<string> txtLines = new List<string>();

    //Fill a List<string> with the lines from the txt file.
    foreach (string str in File.ReadAllLines(fileName))
    {
        txtLines.Add(str);
    }

    //Insert the line you want to add last under the tag 'item1'.
    txtLines.Insert(txtLines.IndexOf(npcName), lineToAdd);

    //Clear the file. The using block will close the connection immediately.
    using (File.Create(fileName)) { }

    //Add the lines including the new one.
    foreach (string str in txtLines)
    {
        File.AppendAllText(fileName, str + Environment.NewLine);
    }
}

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两年UPDATE：这是我最高的投票答案，但我两年前写的，它可以使用一些改进。我正在做一些奇怪的东西，在上​​面的方法，我想为未来的读者一个更好的选择。

---

TWO YEAR UPDATE: This is my highest voted answer but I wrote it two years ago and it could use some improvements. I'm doing some strange things in the above method and I want to provide a better alternative for future readers.

public void CreateEntry(string npcName) //npcName = "item1"
{
    var fileName = "test.txt";
    var endTag = String.Format("[/{0}]", npcName);
    var lineToAdd = "//Add a line here in between the specific boundaries";

    var txtLines = File.ReadAllLines(fileName).ToList();   //Fill a list with the lines from the txt file.
    txtLines.Insert(txtLines.IndexOf(endTag), lineToAdd);  //Insert the line you want to add last under the tag 'item1'.
    File.WriteAllLines(fileName, txtLines);                //Add the lines including the new one.
}

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