Msdn write stream to file

Writes a sequence of bytes from a read-only span to the current file stream and advances the current position within this file stream by the number of bytes written. Use the CanWrite property to determine whether the current instance supports writing. Use the WriteAsync method to write asynchronously to the current stream. If the write operation is successful, the position within the file stream advances by the number of bytes written.

If an exception occurs, the position within the file stream remains unchanged. The zero-based byte offset in array from which to begin copying bytes to the stream. Another thread may have caused an unexpected change in the position of the operating system's file handle. This code example is part of a larger example provided for the Lock method. This method overrides Write. Friday, May 22, AM. WriteAll Bytes, Lines or Text. Also the MemoryStream class has WriteTo method that does what you need i.

But unfortunately there is no general "WriteAll" method. And I agree that it might be useful. I have a Stream, not bytes, lines, nor text. MemoryStream also seems to require that I first read the entire file into memory into a byte buffer or have a loop where I read N bytes over and over I can do that directly by using Read on the source and Write on the target, but I just thought this would be an obvious method that surely must exist somewhere?

Or at least there must be a very good reason for why it's missing? I mean, if you're writing "stream oriented" IO it seems pretty common that you'd want to compose a whole bunch of streams in a pipeline without ever needing to manually manage any buffers e. As I said, there's no way to do it easily and I agree with you that it would be an useful feature.

But you have to keep in mind that not all streams are as simple as your ordinary file or memory stream. In this case, the cached position in the FileStream object and the cached data in the buffer could be compromised. The FileStream object routinely performs checks on methods that access the cached buffer to ensure that the operating system's handle position is the same as the cached position used by the FileStream object.

If an unexpected change in the handle position is detected in a call to the Read method, the. NET Framework discards the contents of the buffer and reads the stream from the file again. This can affect performance, depending on the size of the file and any other processes that could affect the position of the file stream.

If an unexpected change in the handle position is detected in a call to the Write method, the contents of the buffer are discarded and an IOException exception is thrown. A FileStream object will not have an exclusive hold on its handle when either the SafeFileHandle property is accessed to expose the handle or the FileStream object is given the SafeFileHandle property in its constructor. Initializes a new instance of the FileStream class with the specified path and creation mode.

Initializes a new instance of the FileStream class with the specified path, creation mode, access rights and sharing permission, the buffer size, and additional file options. Initializes a new instance of the FileStream class with the specified path, creation mode, access rights and sharing permission, the buffer size, additional file options, access control and audit security. Gets the operating system file handle for the file that the current FileStream object encapsulates.

Gets a value that indicates whether the FileStream was opened asynchronously or synchronously. Gets the absolute path of the file opened in the FileStream. Gets or sets a value, in milliseconds, that determines how long the stream will attempt to read before timing out. Gets a SafeFileHandle object that represents the operating system file handle for the file that the current FileStream object encapsulates.

Gets or sets a value, in milliseconds, that determines how long the stream will attempt to write before timing out. Begins an asynchronous read operation. Begins an asynchronous write operation. Closes the current stream and releases any resources such as sockets and file handles associated with the current stream. Instead of calling this method, ensure that the stream is properly disposed. Reads the bytes from the current stream and writes them to another stream, using a specified buffer size.

Asynchronously reads the bytes from the current stream and writes them to another stream, using a specified cancellation token. Asynchronously reads the bytes from the current stream and writes them to another stream, using a specified buffer size. Asynchronously reads the bytes from the current file stream and writes them to another stream, using a specified buffer size and cancellation token. Asynchronously reads the bytes from the current stream and writes them to another stream, using a specified buffer size and cancellation token.

Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object.

Allocates a WaitHandle object. Releases all resources used by the Stream. Releases the unmanaged resources used by the FileStream and optionally releases the managed resources. Asynchronously releases the unmanaged resources used by the FileStream. Asynchronously releases the unmanaged resources used by the Stream. Waits for the pending asynchronous read operation to complete.

Waits for the pending asynchronous read to complete. Ends an asynchronous write operation. Ensures that resources are freed and other cleanup operations are performed when the garbage collector reclaims the FileStream.

Next, get an output stream by calling the IRandomAccessStream. GetOutputStreamAt method from the stream. If you're using C , then enclose this in a using statement to manage the output stream's lifetime.

Now add this code if you're using C , within the existing using statement to write to the output stream by creating a new DataWriter object and calling the DataWriter. WriteString method. Lastly, add this code if you're using C , within the inner using statement to save the text to your file with DataWriter. StoreAsync and close the stream with IOutputStream. For additional details and best practice guidance, see Best practices for writing to files.

Here's how to read from a file on disk using the StorageFile class. The common first step for each of the ways of reading from a file is to get the file with StorageFolder. Read text from your file by calling the FileIO. ReadTextAsync method.