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When overridden in a derived class, clears all buffers for this stream and causes any buffered data to be written to the underlying device.
public: abstract void Flush();
public abstract void Flush ();
abstract member Flush : unit -> unit
Public MustOverride Sub Flush ()
An I/O error occurs.
Flush on streams that implement a buffer. Use this method to move any information from an underlying buffer to its destination, clear the buffer, or both. Depending upon the state of the object, you might have to modify the current position within the stream (for example, if the underlying stream supports seeking). For additional information see CanSeek.
In a class derived from Stream that doesn't support writing, Flush is typically implemented as an empty method to ensure full compatibility with other Stream types since it's valid to flush a read-only stream.
When using the StreamWriter or BinaryWriter class, do not flush the base Stream object. Instead, use the class's Flush or Close method, which makes sure that the data is flushed to the underlying stream first and then written to the file.