如何在C#代码中替换\r\n实现字符串换行？

针对你提供的Excel验证代码，这里有几种替代\r\n插入新行的实用方式：

1. 使用Environment.NewLine（推荐跨平台场景） #

这是C#提供的平台无关换行符，会自动根据运行环境选择Windows的\r\n或类Unix系统的\n，适配性更强。

替换代码示例：

} else if (rowCount <= 2 && wsName.ToLower().Contains("ver82")) { 
    premilinaryValidationErrors.Append($"There are no employees in the census file you are attempting to upload. {Environment.NewLine} Please verify you are uploading the correct template.");
} else if (rowCount <= 1 && wsName.ToLower().Contains("ver81")) { 
    presilinaryValidationErrors.Append($"There are no employees in the census file you are attempting to upload. {Environment.NewLine} Please verify you are uploading the correct template.");
}

也可以用字符串拼接的方式：

premilinaryValidationErrors.Append("There are no employees in the census file you are attempting to upload. " + Environment.NewLine + " Please verify you are uploading the correct template.");

2. 直接使用\n换行符 #

如果你的应用只运行在类Unix环境，或者前端/接收端只识别\n，可以直接把\r\n替换成\n：

premilinaryValidationErrors.Append("There are no employees in the census file you are attempting to upload. \n Please verify you are uploading the correct template.");

3. 逐字字符串（@前缀）直观换行 #

用@标记逐字字符串后，你可以直接在代码里换行，字符串会保留这个换行格式，可读性更好：

premilinaryValidationErrors.Append(@"There are no employees in the census file you are attempting to upload. 
 Please verify you are uploading the correct template.");

内容的提问来源于stack exchange，提问作者Hobbs Martin