C# open text file read line by line

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August undefined, 2024

Web[C#] string [] lines = File.ReadAllLines ( @"c:\file.txt", Encoding .UTF8); Read Text File into String Array (with StreamReader) If you look under the hood of the File.ReadAllLines method, you can find implementation similar to this. As it was previously written, the using statement disposes StreamReader and FileStream (which closes the file). [C#] WebMar 27, 2024 · A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

Reading and writing very large text files in C# - Stack Overflow

WebJun 18, 2014 · You can force your StreamReader class to read your CSV from the beginning. rd.DiscardBufferedData (); rd.BaseStream.Seek (0, SeekOrigin.Begin); rd.BaseStream.Position = 0; You can try to fix your CSV file, such as clean null character and Convert Unix newline to Windows newline. Share. WebMay 13, 2009 · StreamReader reader = File.OpenText ("filename.txt"); string line; while ( (line = reader.ReadLine ()) != null) { string [] items = line.Split ('\t'); int myInteger = int.Parse (items [1]); // Here's your integer. george weber chevrolet used cars

Edit a specific Line of a Text File in C# - Stack Overflow

WebApr 8, 2016 · using (var fs = File.Open (filePath, FileMode.Open, FileAccess.ReadWrite))) { var destinationReader = StreamReader (fs); var writer = StreamWriter (fs); while ( (line = reader.ReadLine ()) != null) { if (line_number == line_to_edit) { writer.WriteLine (lineToWrite); } else { destinationReader .ReadLine (); } line_number++; } } Share WebJan 17, 2009 · 1. If anyone wants to be able to share the file with another process, such as when you want to read a log file that's open for writing by the parent, just replace: File.OpenRead (filename) With: new FileStream (filename, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite) – mostlydev. May 27, 2015 at 19:55. WebTo read a text file line by line using C# programming, follow these steps. Import System.IO for function to read file contents. Import System.Text to access Encoding.UTF8. Use FileStream to open the text file in Read mode. Use StreamReader to read the file stream. christian holmes caba

C# Read a Text File Line by Line Delft Stack

How To Read A Text File In C# - c-sharpcorner.com

WebNov 13, 2024 · string line; string filePath = "c:\\test.txt"; if (File.Exists (filePath)) { // Read the file and display it line by line. StreamReader file = new StreamReader (filePath); while ( (line = file.ReadLine ()) != null) { listBox1.Add (line); } file.Close (); } Share Improve this answer Follow answered Aug 22, 2011 at 16:32 Julian 97 1 2 WebIn C#, you can use the System.IO namespace to read a text file line by line. The StreamReader class is particularly useful for this purpose. Here's an example of how you … christian holm hansenWebJun 28, 2014 · 3. If you want to read a file line-by-line, do this: foreach (string line in File.ReadLines ("filename")) { // process line here } If you really must read a line and save the position, you need to save the last line number read, rather than … george weeded 1/5 of the garden and summer

"WebMar 19, 2012 · List bookList=new List (); bookList=BookManager.GetBookList (); // gets the list of books read from the text file. Store this in your global scope so that you can access it from any of your methods in the form. When you want to access specific data about a book use Linq to get it " - C# open text file read line by line

C# open text file read line by line

How To Read A Text File In C# - c-sharpcorner.com

WebApr 8, 2024 · Read a Text File Line by Line by Using File.ReadLines () Method in C# File.ReadLines () method is the best method found to read a text file line by line … WebDec 1, 2014 · using (var reader = File.OpenText (path)) { string line; while ( (line = reader.ReadLine ()) != null) { foreach (var item in Encoding.UTF8.GetBytes (line)) { //do your work here //break the foreach loop if the condition is not satisfied } } } Share Improve this answer Follow edited Dec 1, 2014 at 22:57 answered Dec 1, 2014 at 22:40

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WebNov 19, 2010 · File.ReadAllLines () returns an array of strings. If you want to use an array of strings you need to call the correct function. You could use Jim solution, just use ReadAllLines () or you could change your return type. This would also work: System.Collections.Generic.IEnumerable lines = File.ReadLines ("c:\\file.txt"); WebFile.ReadLines () method to read a text file that has lots of lines. File.ReadLines () method internally creates Enumerator. So we can call it in the foreach and every time foreach asks for a next value, it calls …

WebFeb 8, 2024 · The following code reads a text file into a string. // Read entire text file content in one string string text = File.ReadAllText( textFile); Console.WriteLine( text); … WebNov 6, 2011 · If you're just wanting to read lines in a file without doing much, according to these benchmarks, the fastest way to read a file is the age old method of: using (StreamReader sr = File.OpenText (fileName)) { string s = String.Empty; while ( (s = …

WebMar 24, 2014 · Reading text files line by line, with exact offset/position reporting. My simple requirement: Reading a huge (> a million) line test file (For this example assume it's a CSV of some sorts) and keeping a reference to the beginning of that line for faster lookup in the future (read a line, starting at X). I tried the naive and easy way first ... WebOct 19, 2014 · To read a text file one line at a time you can do like this: using System.IO; using (var reader = new StreamReader (fileName)) { string line; while ( (line = reader.ReadLine ()) != null) { // Do stuff with your line here, it will be called for each // line of text in your file. } } There are other ways as well.

WebDec 24, 2011 · using (FileStream file = new FileStream("file.bin", FileMode.Open, FileAccess.Read)) { byte[] bytes = new byte[file.Length]; file.Read(bytes, 0, (int)file.Length); ms.Write(bytes, 0, (int)file.Length); } If the files are large, then it's worth noting that the reading operation will use twice as much memory as the total file size. One solution ...

WebFeb 18, 2014 · using (var reader = new StreamReader ("c:\\test.txt")) { string line1 = reader.ReadLine (); string line2 = reader.ReadLine (); string line3 = reader.ReadLine (); // etc.. } If you really want to write a method NextLine, then you need to store the created StreamReader object somewhere and use that every time. Somewhat like this: christian holteWebJul 28, 2024 · using (StreamReader sr = new StreamReader ("TestFile.txt")) { string line; // Read and display lines from the file until the end of // the file is reached. while ( (line = sr.ReadLine ()) != null) { Debug.WriteLine (line); TextBox.Text=line; } } I tried this but only one (the last) line of the text file is shown. christian holmes iv wikiWebAdd a comment. 16. You can use LINQ: int result = File.ReadLines (filePath).Count (line => line.StartsWith (word)); File.ReadLines returns an IEnumerable that lazily reads each line from the file without loading the whole file into memory. Enumerable.Count counts the lines that start with the word. george webster public schoolWebYou can use File.ReadLines() which returns an IEnumerable.You can then use LINQ's Skip() and FirstOrDefault() methods to go to skip the number of lines you want, and take the first item (or return null if there are no more items):. line = File.ReadLines().Skip(lineNumber - 1).FirstOrDefault() Jeppe has commented that this … george weber ford granite city ilWebJun 9, 2016 · using (StreamWriter file = new StreamWriter (@strFullFileName, true, System.Text.Encoding.UTF8)) using (StreamReader srStreamRdr = new StreamReader (strFileName)) { while ( (strDataLine = srStreamRdr.ReadLine ()) != null) { lngCurrNumRows++; if (lngCurrNumRows > 1) file.WriteLine (strDataRow); } } christian holmes iv net worthWebApr 7, 2024 · Innovation Insider Newsletter. Catch up on the latest tech innovations that are changing the world, including IoT, 5G, the latest about phones, security, smart cities, AI, robotics, and more. christian holtet christian h olsen jr norwalk ct