控制字符（Control Character）是出现于特定的信息文本中，表示某一控制功能的字符。
回应标头的长度会接收回应状态列和 HTTP 通讯协定中所收到的任何额外控制字元。
The length of the response header received the response status line and any extra control characters that are received as part of HTTP protocol.
本主题描述如何在序列化xml树状结构时控制空白字元。
This topic describes how to control white space when serializing an XML tree.
如果属性传回负值，就表示控制项的内容中找不到要搜寻的字元。
If the property returns a negative value, the characters being searched for were not found within the contents of the control.
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