The writing method for special symbols in the config file in C #.

App. Config:

1 <?xml version= "1.0" encoding= "Utf-8"? >2 <configuration>3     <startup> 4         < Supportedruntime version= "v4.0" sku= ". netframework,version=v4.5 "/>5     </startup>6   <connectionstrings>7     <add name=" Dbconnstring "connectionstring=" Data source=.;i Nitial catalog=mytest123456; User Id=sa; password=123&456 "/>8   </connectionstrings>9 </configuration>

Because the password for the database connection contains the special character "&", the following error message appears at compile time:

Obviously the compiler does not know "&456", how to solve it, always can not change the password it?

In fact, App. Config is an XML file with special characters to be HTML escaped in an XML file.

<,>,& in HTML has special meanings (<,>, used for link-sign,& for escaping) and cannot be used directly. These symbols are not displayed in the pages we end up seeing, and if we want to display them in a Web page, we'll use the HTML escape string (Escape Sequence).

HTML Special escape Character list

Most commonly used character entities

Show Description Entity name Entity number

Spaces &nbsp; & #160;

< less than &lt; & #60;

> Greater than &gt; & #62;

& & Symbols &amp; & #38;

"Double quotes &quot; & #34;

© Copyright &copy; & #169;

® Registered Trademarks &reg; & #174;

™ Trademark (United States) ™& #8482;

X Multiplication Sign &times; & #215;

÷ Division sign &divide; & #247;

So just escape the "&" and change the password to

password=123&amp;456 "

Succeeded by compiling.

The writing method for special symbols in the config file in C #.