How to overwrite a string from a text file? Without creating a new text file in the process-CodePudding

Is there any way to overwrite a certain string (let's say the string from line 6) from a file, without creating a new text file?

CodePudding user response：

You can write a method like this to update a line of an existing txt file ;

public void OverwriteLine(string newText, string filePath, int lineNumber)
{   
     string[] allLines = File.ReadAllLines(filePath);
     allLines[lineNumber - 1] = newText;
     File.WriteAllLines(filePath, allLines);
}

CodePudding user response：

You can do it using File.ReadAllLines() and File.WriteAllLines(),

var path = @"c:\text.txt";  //Your file Path
var allLines = File.ReadAllLines(path);  //Read all data line by line.
allLines[5] = "Updated data";  //Update 6th line data
File.WriteAllLines(path, allLines); //Re-write the content.