是否可以将文件名包含在 app.config 文件中并在您的代码中使用它们？
例如，此代码完美运行：
string folder = @"C:\CDR_FTP1\ttfiles_exported\";
如果我想从 app.config 文件中获取上述值
例如，在 app.config 中，我可以尝试使用以下内容：
<add key="InputDir" value=@"D:\CDR_FTP1\ttfiles_exported\" />
我无法添加“@”，因为它会给我以下错误：
"The character '@', hexadecimla value 0x40 is illegal at the beginning of an XML name."
如果我尝试在下面的代码中使用它，那很好，但是我需要在哪里以及如何粘贴“@”以使应用程序正确读取它？
string folder = ConfigurationSettings.AppSettings["InputDir"];
只需使用：
<add key="InputDir" value="D:\CDR_FTP1\ttfiles_exported\" />
XML 属性中无需转义\。
扩展基里尔的答案：
XML 属性中的特殊字符与 C# 字符串中的特殊字符不同。
In C# the character '\' is the string escape character, used to denote escape sequences such as '\n' for end of line, as you are probably aware; and hence needs to be escaped either as '\\' or by using @"".
In XML '\' has no especial meaning inside attribute values and can be use as is. This is not true for the '&' and '"' characters among others. If you wanted to include the value:
M & M "The chocolates"
in an app.config they would have to be escaped so:
<add key="SomeString" value="M & M "The chocolates"" />