doc: update docs/cs.md (#514)
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docs/cs.md
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docs/cs.md
@ -289,6 +289,17 @@ Console.WriteLine(multiLine); // => Content begin "Hello World!" /\n<>"" end.
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### 字符串操作
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### 字符串操作
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#### 字符串判空
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```cs
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string name; //空引用
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string gender = ""; //空值
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// 使用 string.IsNullOrEmpty(字符串) 方法,返回 bool 型
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Console.WriteLine(string.IsNullOrEmpty(name)); //输出 true
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Console.WriteLine(string.IsNullOrEmpty(gender)); // 输出 true
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```
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#### 字符串分割
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#### 字符串分割
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```cs
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```cs
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