doc: Update cs.md #106
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@ -188,16 +188,17 @@ lengthOfString.Contains("How"); // => true
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### 频繁字符串拼接
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```cs
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// 对于频繁拼接字符串的场景(如:成百上千次循环)
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// 使用 System.Text.StringBuilder 提升性能
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var sb = new StringBuilder();
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for (int i = 0; i < 100; i++)
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{
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sb.Append(i.ToString());
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}
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Console.WriteLine(sb.ToString()); // => 123456789....
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Console.WriteLine(sb.ToString());
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// => 123456789....
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```
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对于频繁拼接字符串的场景(如:成百上千次循环),使用 `System.Text.StringBuilder` 提升性能
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<!--rehype:className=wrap-text-->
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### 原始字符串文本
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