使用
StringBuilder：
StringBuilder sb = new StringBuilder(theString);sb[index] = newChar;theString = sb.ToString();
![替换字符串中给定索引的char？[重复]](http://www.mshxw.com/aiimages/31/465215.png "替换字符串中给定索引的char？[重复]")
使用
StringBuilder：
StringBuilder sb = new StringBuilder(theString);sb[index] = newChar;theString = sb.ToString();
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