Create and write to a text file inmemory and convert to byte array in one go
Solution 1
Write text into Memory Stream.
byte[] bytes = null;
using (var ms = new MemoryStream())
{
using(TextWriter tw = new StreamWriter(ms)){
tw.Write("blabla");
tw.Flush();
ms.Position = 0;
bytes = ms.ToArray();
}
}
UPDATE
Use file stream Directly and write to File
using (var fs = new FileStream(@"C:\ed\test.csv", FileMode.Create, FileAccess.ReadWrite))
{
using (TextWriter tw = new StreamWriter(fs))
{
tw.Write("blabla");
tw.Flush();
}
}
Solution 2
You can get a byte array from a string using encoding:
Encoding.ASCII.GetBytes(aString);
Or
Encoding.UTF8.GetBytes(aString);
But I don't know why you would want a csv as bytes. You could load the entire file to a string, add to it and then save it:
string content;
using (var reader = new StreamReader(filename))
{
content = reader.ReadToEnd();
}
content += "x,y,z";
using (var writer = new StreamWriter(filename))
{
writer.Write(content);
}
Update: Create a csv in memory and pass back as bytes:
var stringBuilder = new StringBuilder();
foreach(var line in GetLines())
{
stringBuilder.AppendLine(line);
}
return Encoding.ASCII.GetBytes(stringBuilder.ToString());
HelloWorld
Updated on July 09, 2022Comments
-
HelloWorld almost 2 years
How can I create a .csv file implicitly/automatically by using the correct method, add text to that file existing in memory and then convert to in memory data to a byte array?
string path = @"C:\test.txt"; File.WriteAllLines(path, GetLines()); byte[] bytes = System.IO.File.ReadAllBytes(path);
With that approach I create a file always (good), write into it (good) then close it (bad) then open the file again from a path and read it from the hard disc (bad)
How can I improve that?
UPDATE
One nearly good approach would be:
using (var fs = new FileStream(@"C:\test.csv", FileMode.Create, FileAccess.ReadWrite)) { using (var memoryStream = new MemoryStream()) { fs.CopyTo(memoryStream ); return memoryStream .ToArray(); } }
but I am not able to write text into that filestream... just bytes...
UPDATE 2
using (var fs = File.Create(@"C:\temp\test.csv")) { using (var sw = new StreamWriter(fs, Encoding.Default)) { using (var ms = new MemoryStream()) { String message = "Message is the correct ääüö Pi(\u03a0), and Sigma (\u03a3)."; sw.Write(message); sw.Flush(); fs.CopyTo(ms); return ms.ToArray(); } } }
The string message is not persisted to the test.csv file. Anyone knows why?