Write values in file in c#

Question

I am trying to write values to file in C#. I am trying to use either the following code:

 using (StreamWriter writer = new StreamWriter("values.txt"))
 {
            writer.Write("Word");
            writer.WriteLine("word 2");
            writer.WriteLine("Line");
 }

I got the error: Error the best overloaded method match for System.IO.StranWriter.StreamWriter(System.IO.Stream) has some invalid arguments.

or the following code:

string path = @"values.txt";

if (!File.Exists(path))
{
     // Create a file to write to. 
     using (StreamWriter sw = File.CreateText(path))
     {
            sw.WriteLine("Hello");
            sw.WriteLine("And");
            sw.WriteLine("Welcome");
     }
}

I got the following error: The name 'File' does not exist in the current context. When am I missing here?

EDIT: Basically I tried to change FIle to System.IO.File and I got the following message:The type or namespace 'File' does not exist in the namespace System.IO(are you missing an assembly reference). My code is in a function which I call from public MainPage() function in windows Application.

EDIT2: I tried to follow the solution of the proposed duplicate post. I got the message that await operator can only be used within an async method.

Your `if(!File...` is the problem. You probably forgot to declare the using. — C4d, Jun 25 '15 at 08:29
Show the declaration of pathFile. And ask 1 question per question, answers are now getting mixed up between 1st and 2nd problem. — H H, Jun 25 '15 at 08:30
Please show the real exceptions and don't write them here manually. Also the first exception-message is wrong: `System.IO.StranWriter.StreamWriter` — Tim Schmelter, Jun 25 '15 at 08:30
No people stop downvoting I have already define using System.IO — Jose Ramon, Jun 25 '15 at 08:33
Could you show your variable `pathFile` in the first code-example? — C4d, Jun 25 '15 at 08:36
string path = @"values.txt"; or using (StreamWriter writer = new StreamWriter("tet.txt")) — Jose Ramon, Jun 25 '15 at 08:36
Read the comments here carefully and edit your question with the requested information. — H H, Jun 25 '15 at 08:37
Is this for regular .NET or for WinRT / Phone? Tell us the version(s) being used. — H H, Jun 25 '15 at 08:43
We're still not seeing `pathFile`. Incomplete code is a close reason. — H H, Jun 25 '15 at 08:45
Edit your question then please. The comment-section isnt an extension for your question. — C4d, Jun 25 '15 at 08:49
Edit that into your question. Also add tags for the relevant platform. — H H, Jun 25 '15 at 08:49
Re Edit2: Look up async/wait, it's a complex subject but a few good examples will get you going. Don't add follow-ups to a question, and this one would be a duplicate too. — H H, Jun 25 '15 at 14:29

H H · Accepted Answer · 2015-06-26T08:51:13.037

3

OK, we have to guess a lot here but it looks like you're writing a Phone, Store or Universal App.

The new Windows Runtime does not provide you with all the old synchronous classes and methods.

There is no FileStream(string) constructor and no static IO.File class on your platform.

edited Jun 26 '15 at 08:51

answered Jun 25 '15 at 08:51

H H

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I followed that instructions to create my project http://kinect.github.io/tutorial/lab01/index.html. It is a blank project for windows 8.1 – Jose Ramon Jun 25 '15 at 08:52
1

Yes, big difference between an "App" and an "Application" here. You can't use the 'normal' I/O code samples you will find, look especially for WinRT. – H H Jun 25 '15 at 08:54

score 1 · Answer 2 · answered Jun 25 '15 at 08:28

1

I suggest

IO.File.WriteAllText(fileFullPath, stringBuilder.ToString());

...instead of the StreamWriter.

answered Jun 25 '15 at 08:28

Xavier Peña

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2

Good idea but not really an answer. – H H Jun 25 '15 at 08:28
I don't know, I wish someone gave me this answer when I started learning on my own. It would have saved me a lot of trouble. – Xavier Peña Jun 25 '15 at 09:34

score 1 · Answer 3 · answered Jun 25 '15 at 08:29

1

What i see is you are trying to write in stream object, Simply you can do by following code

 System.IO.File.AppendAllText(@"{Filepath}","your text");

Please note using WriteAllText or ,,, will replace all the content with your new value.

answered Jun 25 '15 at 08:29

Behzad

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voytek · Answer 4 · 2015-06-25T08:53:12.110

1

Looks like You're using StreamWriter correctly. If nothing helps, create new solution from scratch, console application and paste this code. It has to work:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            using (StreamWriter writer = new StreamWriter("test.txt"))
            {
                writer.Write("Line 1");
                writer.WriteLine("Still line 1");
                writer.WriteLine("Line 2");
            }
        }
    }
}

Obviously look for you test.txt file in bin folder

edited Jun 25 '15 at 08:53

answered Jun 25 '15 at 08:31

voytek

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I got the same error. – Jose Ramon Jun 25 '15 at 08:32
Did you add `using System.IO;` ? – voytek Jun 25 '15 at 08:33
Yes!! I have already add System.IO – Jose Ramon Jun 25 '15 at 08:34
Instead of `pathFile` paste there hard-coded path like in my example. Did you try that? – voytek Jun 25 '15 at 08:35
This is how it should be done: http://www.dotnetperls.com/streamwriter – voytek Jun 25 '15 at 08:42
@JoseRamon You can create completely new project - console application, in different place. Paste my code and it must work. – voytek Jun 25 '15 at 08:54
Yes but my issue here that I wans a black windows app not a blank console application. – Jose Ramon Jun 25 '15 at 09:06

Write values in file in c#

4 Answers4