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File.ReadAllText does not return full content in C#

In my c# program, I have an image which is successfully stored in a byte[] data called bytes. I successfully write it into a .txt file using the following code
using (FileStream file = new FileStream("text.txt", FileMode.Create, FileAccess.Write))
{
file.Write(bytes, 0, numToWrite);
file.Close();
}
The above code stores the exact content I wish to store.
Whenever I wish to read the content of the file, text.txt, into textbox I only get the first line or little part of the first line. But when I open the file, text.txt, I see the complete content.
This is the code I use to read the file
string kk = File.ReadAllText("text.txt");

You have said at the start of the question that you have a byte[] that you are writing into the file. It's not clear why you decided not to use File.WriteAllBytes but let's assume that your code is correctly writing all the data into the file called "text.txt", which has been explained in comments does not magically make this a text file.
Using File.ReadAllText is not going to work because The data in the file is binary data, not text. As you can see from the remarks on the documentation, it will try to decide the encoding of the text file (which won't work because it contains binary data) and will do end of line processing which you won't want for a binary file.
The best way to read the data back is to use File.ReadAllBytes, which gives you back a byte[], just like you started with.

C# .csv-file in WinForm with Ä, Ö, Ü [duplicate]

I'm using the code below to read a text file that contains foreign characters, the file is encoded ANSI and looks fine in notepad. The code below doesn't work, when the file values are read and shown in the datagrid the characters appear as squares, could there be another problem elsewhere?
StreamReader reader = new StreamReader(inputFilePath, System.Text.Encoding.ANSI);
using (reader = File.OpenText(inputFilePath))
Thanks
Update 1: I have tried all encodings found under System.Text.Encoding. and all fail to show the file correctly.
Update 2: I've changed the file encoding (resaved the file) to unicode and used System.Text.Encoding.Unicode and it worked just fine. So why did notepad read it correctly? And why didn't System.Text.Encoding.Unicode read the ANSI file?

You may also try the Default encoding, which uses the current system's ANSI codepage.
StreamReader reader = new StreamReader(inputFilePath, Encoding.Default, true)
When you try using the Notepad "Save As" menu with the original file, look at the encoding combo box. It will tell you which encoding notepad guessed is used by the file.
Also, if it is an ANSI file, the detectEncodingFromByteOrderMarks parameter will probably not help much.

I had the same problem and my solution was simple: instead of
Encoding.ASCII
use
Encoding.GetEncoding("iso-8859-1")
The answer was found here.
Edit: more solutions. This maybe more accurate one:
Encoding.GetEncoding(1252);
Also, in some cases this will work for you too if your OS default encoding matches file encoding:
Encoding.Default;

Yes, it could be with the actual encoding of the file, probably unicode. Try UTF-8 as that is the most common form of unicode encoding. Otherwise if the file ASCII then standard ASCII encoding should work.

Using Encoding.Unicode won't accurately decode an ANSI file in the same way that a JPEG decoder won't understand a GIF file.
I'm surprised that Encoding.Default didn't work for the ANSI file if it really was ANSI - if you ever find out exactly which code page Notepad was using, you could use Encoding.GetEncoding(int).
In general, where possible I'd recommend using UTF-8.

Try a different encoding such as Encoding.UTF8. You can also try letting StreamReader find the encoding itself:
StreamReader reader = new StreamReader(inputFilePath, System.Text.Encoding.UTF8, true)
Edit: Just saw your update. Try letting StreamReader do the guessing.

For swedish Å Ä Ö the only solution form the ones above working was:
Encoding.GetEncoding("iso-8859-1")
Hopefully this will save someone time.

File.OpenText() always uses an UTF-8 StreamReader implicitly. Create your own StreamReader
instance instead and specify the desired encoding.
like
using (StreamReader reader = new StreamReader(#"C:\test.txt", Encoding.Default)
{
// ...
}

I solved my problem of reading portuguese characters, changing the source file on notepad++.
C#
var url = System.Web.HttpContext.Current.Server.MapPath(#"~/Content/data.json");
string s = string.Empty;
using (System.IO.StreamReader sr = new System.IO.StreamReader(url, System.Text.Encoding.UTF8,true))
{
s = sr.ReadToEnd();
}

I'm also reading an exported file which contains french and German languages. I used Encoding.GetEncoding("iso-8859-1"), true which worked out without any challenges.

for Arabic, I used Encoding.GetEncoding(1256). it is working good.

I had a similar problem with ProcessStartInfo and the property StandardOutputEncoding. I set it for German language console output to code page 850. This way I could read the output like ausführen instead of ausf�hren.

Replace Text in a TextFile c#

What is the best way to replace text in a text file?
I do not want to give the file a new name
I do not want the text to become one long string which is what happens when I use File.ReadAllText because this is stored as a string and I loose carriage returns etc...
Also, I guess I will run into issues using a StreamReader/StreamWriter because you cannot read and write to the same file?
Thanks

You can do it with a stream opened for both reading and writing:
FileStream fileStream = new FileStream(#"c:\myFile.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
var streamWriter = new StreamWriter(fileStream);
var streamReader = new StreamReader(fileStream);
...
fileStream .Close();
But the most easy way is still to read all file, edit the text and write it back to the file:
var text = File.ReadAllText(#"c:\myFile.txt");
...
File.WriteAllText(#"c:\myFile.tx", text);

Depending on your file format, you could also read your files line by line (using File.ReadLines) and perform the text replacements for each line.
You can also refer to this answer for a variant based on streams, which is the preferred way if your file is large.
How to read a large (1 GB) txt file in .NET?

Problems with strings in the CSV file

I have an application that reads information from a CSV file to write it to the database. But some characters (example: º ç) are appearing problems Gravalos base. Anyone know how to fix this problem?
Thank you.
I'm using these lines of code to read the information from the CSV file:
string directory = #"C:\test.csv";
StreamReader stream = new StreamReader(directory);
string line = "";
line = stream.ReadLine();
string[] column = line.Split(';');

StreamReader defaults to UTF8 encoding and your file is in a different encoding. Try specifying it like this...
var encoding = Encoding.UTF16;
StreamReader stream = new StreamReader(directory, encoding);
Note that you need to know what encoding the file is in to properly read it... I'm just guessing that it might be UTF16 but obviously I can't know what it is.

You should specify the right encoding when reading the file. The default is UTF-8. Your file is probably encoded with a different encoding.

This is most likely related to the Encoding that is used when reading the file. By default, UTF8 is assumed as the Encoding. In order to read the file correctly, you need to specify the right encoding, e.g.:
string directory = #"C:\test.csv";
using(StreamReader stream = new StreamReader(directory, Encoding.ASCII))
{
string line = "";
line = stream.ReadLine();
string[] column = line.Split(';');
}
You can try the following encodings (see this link for a complete list):
Encoding.Default for ANSI encoding based in the current windows code page.
Encoding.ASCII for ASCII encoding.
Encoding.UTF* for different Unicode encodings.
Please note that I enclosed the StreamReader in a using block so that it is disposed when it is not needed anymore.

How to read kmz stream to parse kml on Windows Phone 7

I want to convert a kmz stream to a kml stream to parse it.
I tried this to do that with SharpZipLib because I read that kmz is just an zipfile of the kml.
My code :
ZipInputStream zipInputStream = new ZipInputStream(myKmzStream);
ZipEntry zipEntry = zipInputStream.GetNextEntry();
// here, zipEntry as a name "doc.kml"
//but zipEntry.ExtraData is null...
byte[] kmlContent = zipEntry.ExtraData; // null
Is there any reason I get this result ?
Thanx for help :)

My opinion is that ExtraData is not set (that why the null value). You need to extract the data from the ZIP (KMZ) file out to a stream to parse it further.
Take a look at this sample:
https://github.com/icsharpcode/SharpZipLib/wiki/Zip-Samples#-unpack-a-zip-with-full-control-over-the-operation
Hope it helps!
Cheers,