If the specified value is less than the current length of the stream, the stream is truncated.

如果指定值小于流的当前长度，则流被截断。

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If the specified value is larger than the current length of the stream, the stream is expanded.

如果指定值大于当前流的长度，则流被扩展。

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If the specified value is larger than the current length of the stream, the stream is expanded.

如果指定值大于当前流的长度，则流被扩展。

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