The current length is also shown as the user types the text.
在用户键入文本时还将显示当前数据长度。
The new array is generally sized as some factor of the current length.
新数组一般根据当前长度调整大小。
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。
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。
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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