C Write To File Stream
> way to write a stream to a file without having to manually read Microsoft did not include such a method, but as you said you can easily implement it yourself.
New music 2017 mp3 download. I have a StreamReader object that I initialized with a stream, now I want to save this stream to disk (the stream may be a .gif or .jpg or .pdf).
Existing Code:
- I need to save this to disk (I have the filename).
- In the future I may want to store this to SQL Server.
I have the encoding type also, which I will need if I store it to SQL Server, correct?
9 Answers
C Write To File Stream Free
As highlighted by Tilendor in Jon Skeet's answer, streams have a CopyTo method since .NET 4.
Or with the using syntax:
You must not use StreamReader for binary files (like gifs or jpgs). StreamReader is for text data. You will almost certainly lose data if you use it for arbitrary binary data. (If you use Encoding.GetEncoding(28591) you will probably be okay, but what's the point?)
Why do you need to use a StreamReader at all? Why not just keep the binary data as binary data and write it back to disk (or SQL) as binary data?
EDIT: As this seems to be something people want to see.. if you do just want to copy one stream to another (e.g. to a file) use something like this:
To use it to dump a stream to a file, for example:
Note that Stream.CopyTo was introduced in .NET 4, serving basically the same purpose.
I don't get all of the answers using CopyTo, where maybe the systems using the app might not have been upgraded to .NET 4.0+. I know some would like to force people to upgrade, but compatibility is also nice, too.
Another thing, I don't get using a stream to copy from another stream in the first place. Why not just do:
Once you have the bytes, you can easily write them to a file:
This code works as I've tested it with a .jpg file, though I admit I have only used it with small files (less than 1 MB). One stream, no copying between streams, no encoding needed, just write the bytes! No need to over-complicate things with StreamReader if you already have a stream you can convert to bytes directly with .ToArray()!
C Write To File Overwrite
Only potential downsides I can see in doing it this way is if there's a large file you have, having it as a stream and using .CopyTo() or equivalent allows FileStream Buku metode penelitian pendidikan sugiyono pdf. to stream it instead of using a byte array and reading the bytes one by one. It might be slower doing it this way, as a result. But it shouldn't choke since the .Write() method of the FileStream handles writing the bytes, and it's only doing it one byte at a time, so it won't clog memory, except that you will have to have enough memory to hold the stream as a byte[] object. In my situation where I used this, getting an OracleBlob, I had to go to a byte[], it was small enough, and besides, there was no streaming available to me, anyway, so I just sent my bytes to my function, above.
C Sharp Write Stream To File
Another option, using a stream, would be to use it with Jon Skeet's CopyStream function that was in another post - this just uses FileStream to take the input stream and create the file from it directly. It does not use File.Create, like he did (which initially seemed to be problematic for me, but later found it was likely just a VS bug..).
Another option is to get the stream to a byte[] and use File.WriteAllBytes. This should do:
Wrapping it in an extension method gives it better naming: