C# 在文本文件中的特定位置插入文本
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Insert text in a text file at specific position
提问by jacobz
I got a text file with e.g. 3 lines:
我得到了一个文本文件，例如 3 行：
Example Text
Some text here
Text
I want to add some text directly after "here", so it will look like this:
我想在“here”之后直接添加一些文本，所以它看起来像这样：
Example Text
Some text hereADDED TEXT
Text
My code, so far, looks like this, I used some of the code from here, but it doesn't seem to work.
到目前为止，我的代码看起来像这样，我使用了这里的一些代码，但似乎不起作用。
List<string> txtLines = new List<string>();
string FilePath = @"C:\test.txt";
foreach (string s in File.ReadAllLines(FilePath))
{
txtLines.Add(s);
}
txtLines.Insert(txtLines.IndexOf("here"), "ADDED TEXT");
using (File.Create(FilePath) { }
foreach (string str in txtLines)
{
File.AppendAllText(FilePath, str + Environment.NewLine);
}
My problem is:
txtLines.IndexOf("here")returns -1, thus throwing a System.ArgumentOutOfRangeException.
我的问题是：
txtLines.IndexOf("here")返回-1，从而抛出一个System.ArgumentOutOfRangeException.
Can somebody tell me what I am doing wrong?
有人可以告诉我我做错了什么吗？
采纳答案by pingoo
Is there a reason your loading all of your text into a List? You could just update the values as you read them from the file.
您是否有理由将所有文本加载到列表中？您可以在从文件中读取值时更新这些值。
string FilePath = @"C:\test.txt";
var text = new StringBuilder();
foreach (string s in File.ReadAllLines(FilePath))
{
text.AppendLine(s.Replace("here", "here ADDED TEXT"));
}
using (var file = new StreamWriter(File.Create(FilePath)))
{
file.Write(text.ToString());
}
回答by Rezoan
string filePath = "test.txt";
string[] lines = File.ReadAllLines(FilePath);
for (int i = 0; i < lines.Length; i++)
{
lines[i] = lines[i].Replace("here", "here ADDED TEXT");
}
File.WriteAllLines(filePath, lines);
It will do the trick that you want.
它会做你想要的把戏。
回答by ttitto
Here is a piece of code that should help you. Just replace your line txtLines.Insert(txtLines.IndexOf("here"), "ADDED TEXT"); with the below. It finds the first here and replaces it with hereADDED TEXT:
这是一段应该可以帮助您的代码。只需替换您的行 txtLines.Insert(txtLines.IndexOf("here"), "ADDED TEXT"); 与下面。它在此处找到第一个并将其替换为 hereADDED TEXT：
int indx=txtLines.FindIndex(str => str.Contains("here"));
txtLines[indx]= txtLines[indx].Replace("here", "hereADDED TEXT");
