C# read file byte array

It throws an exception if the file exceeds 2 gigabytes. A discussion. This yields fast file formats. Notes, memory. ReadAllBytes can be used to reduce memory usage. If you have a binary file that contains many sub resources, you can load the file into memory with File.

Then Use BinaryReader to index the contents of the file. Also note that the last argument to the FileStream is a buffer size. As always a simple sample program to profile which is fastest will be most beneficial. Why would type of hardware make a difference? So if it's IDE you use some. There are different types of hard disk drives. For example, Seagate drives are classified as "AS" or "NS" with NS being the server based, large cache drive where-as the "AS" drive is the consumer - home computer based drive.

Seek speeds and internal transfer rates also affect how fast you can read something from disk. So you might be able to read the file all at once, but the underlying hardware is still the deciding factor. This code contains a critical bug.

Read is only required to return at least 1 byte. I would make sure to wrap the long to int cast with the checked construct like this: checked int fs. Length — tzup. ReadBytes int fs. Length ; in that using statement.

But that's effectively like what the OP did, just I cut out a line of code by casting fs. Length to int instead of getting the long value of the FileInfo length and converting that. Joel Joel 2 2 silver badges 6 6 bronze badges. OpenRead fileName " as given above. Just removed new keyword before File. OpenRead — Syed Mohamed. Seek offsetFile, SeekOrigin. Resize ref buffer, restBytes ; fs. Show hash.

Menno de Ruiter Menno de Ruiter 23 4 4 bronze badges. Length]; stream. Read bytes, 0, int stream. Golden Lion Golden Lion 2, 2 2 gold badges 15 15 silver badges 25 25 bronze badges. Todd Moses Todd Moses What's the point of using a BufferedStream when you're reading the whole thing at once? He asked for the best performance not to read the file at once. Performance is measurable in the context of an operation.

Additional buffering for a stream that you're reading sequentially, all at once, to memory is not likely to benefit from an extra buffer. ReadAsync buffer, 0, Length. Disha Sharma Disha Sharma 11 3 3 bronze badges. Welcome to Stack Overflow! As explanations are an important part of answers on this platform, please explain your code and how it solves the problem in the question and why it might be better than other answers.

Edit: Oops, forgot the finally part You can use the FileStream. Write byte[] array, int offset, int count method to write it out. Appending employee id as file name and file extension. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Can a Byte[] Array be written to a file in C? Ask Question. Asked 13 years ago. Active 1 year, 3 months ago. Viewed k times. I'm trying to write out a Byte[] array representing a complete file to a file. I don't know how to implement this, what should I try?

George Stocker Roberto Bonini Roberto Bonini 6, 6 6 gold badges 36 36 silver badges 47 47 bronze badges. Add a comment. PathTooLongException: The specified path , file name, or both exceed the system-defined maximum length. DirectoryNotFoundException: The specified path is invalid. UnauthorizedAccessException: This operation is not supported on the current platform.

OR the path specified a directory. OR the caller does not have the required permission. FileNotFoundException: The file specified in the path was not found. NotSupportedException: The path is in an invalid format. SecurityException: The caller does not have the required permission. Return Value: Returns a byte array containing the contents of the file. Below are the programs to illustrate the File. ReadAllBytes String method.