c#把string字符串中的值为1,2,3,如果一个新的字符串不被包含在该字符串中,则在该字符串中追加逗号并加上新的字符串,
时间: 2024-03-27 17:38:20 浏览: 33
以下是一个示例代码,可以实现你的需求:
```csharp
string str = "1,2,3";
string newStr = "4";
if (!str.Contains(newStr))
{
str += "," + newStr;
}
```
这段代码首先检查字符串中是否包含新的字符串。如果不包含,它将在字符串末尾添加逗号和新的字符串。最后,它返回修改后的字符串。
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