If an exception occurs, the current position of the stream is unchanged. Use BinaryReader for reading primitive data filestream write all bytes. Otherwise, Read always reads at least one byte from the stream before returning.
Seek speeds and internal transfer rates also affect how fast you can read something from disk. The returned value is the actual number of bytes read, or zero if the end of the stream is reached. Read is only required to return at least 1 byte. Examples The following example reads the contents from a FileStream and writes it into another FileStream.
Additionally, if you have a ton of objects on the LOH, you can end up with LOH fragmentation the LOH is never compacted which leads to poor performance and out of memory exceptions. The Read method returns zero only after reaching the end of the stream. Methods were called after the stream was closed.
If no data is available from the stream upon a call to Readthe method will block until at least one byte of data can be returned. One thing to remember, is that each of your byte arrays will be released at the mercy of the garbage collector.
The point is, you should consider the full life cycle of your app before necessarily just reading all the bytes into memory the fastest way possible or you might be trading short term performance for overall performance.
Do not interrupt a thread that is performing a read operation. Length to int instead of getting the long value of the FileInfo length and converting that. The offset parameter gives the offset of the byte in array the buffer index at which to begin reading, and the count parameter gives the maximum number of bytes to be read from this stream.
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. If the read operation is successful, the current position of the stream is advanced by the number of bytes read.
An implementation is free to return fewer bytes than requested even if the end of the stream has not been reached.
So you might be able to read the file all at once, but the underlying hardware is still the deciding factor. Length ; in that using statement. There are different types of hard disk drives.FileStream gives you a little more control over writing files, which can be beneficial in certain cases.
It also allows you to keep the file handle open and continuously write data without relinquishing control. Some use cases for a stream: Multiple inputs; Real time data from a memory/network stream.
The following code example shows how to write data to a file, byte by byte, and then verify that the data was written correctly. Use WriteByte to write a byte to a FileStream efficiently.
If the stream is closed or not writable, an exception will be thrown. Note. I have a web server which will read large binary files (several megabytes) into byte arrays. The server could be reading several files at the same time (different page requests), so I am looking for the most optimized way for doing this without taxing the CPU too much.
Join Stack Overflow to learn, share knowledge, and build your career. Dim pathSource As String = "c:\tests\mint-body.com" Dim pathNew As String = "c:\tests\mint-body.com" Try Using fsSource As FileStream = New FileStream(pathSource, _ mint-body.com, mint-body.com) ' Read the source file into a byte array.
C# Append byte array to existing file. Ask Question. however, as an exception (out of memory) is thrown. So, my solution is to write each byte array to an output file separately, (as opposed to combining them and writing them to the file as one) One way would be to create a FileStream with the mint-body.com creation mode.Download