Copies the contents the current stream into another stream.
将当前流的内容复制到另一个流中。
Reads the bytes from the current stream and writes them to the destination stream.
从当前流中读取字节并将其写入到目标流中。
Gets a value that indicates whether the current stream position is at the end of the stream.
取得表示现行资料流位置是否在资料流结尾的值。
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