How to add & sign in C# string

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XML

<appSettings>
  <add key="MongoCon" value="mongodb://asif:pass?@cluster0-shard-00-00.k6lme.mongodb.net:27017,cluster0-shard-00-01.k6lme.mongodb.net:27017,cluster0-shard-00-02.k6lme.mongodb.net:27017/myFirstDatabase?ssl=true&replicaSet=atlas-9yuzik-shard-0&authSource=admin&retryWrites=true&w=majority"/>
</appSettings>

But Compiler gives at & symbol in MongoCon value.

How to resolve it.

What I have tried:

I've tried \& to let compiler recognize its simple & sign, not a special sign.

Posted 2-Jun-21 21:30pm

Asif Rehman

Updated 2-Jun-21 22:13pm

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Richard Deeming · Accepted Answer · 2021-06-02T22:10:00

Solution 1

The config file is an XML file. Any values stored within it need to be properly XML-encoded.

To add an & sign in an XML file, you need to use &.

XML

<add key="MongoCon" value="...?ssl=true&replicaSet=...-shard-0&amp;authSource=admin&amp;retryWrites=true&amp;w=majority"/>

Posted 2-Jun-21 22:10pm

Richard Deeming

OriginalGriff · Accepted Answer · 2021-06-02T22:13:00

For XML, "&" is a special character that "describes" other special characters - this si known as an "escape character" just as "\" is in a C# string.

To include an ampersand in your string, replace it with "&":

XML

<appSettings>
  <add key="MongoCon" value="mongodb://asif:pass?@cluster0-shard-00-00.k6lme.mongodb.net:27017,cluster0-shard-00-01.k6lme.mongodb.net:27017,cluster0-shard-00-02.k6lme.mongodb.net:27017/myFirstDatabase?ssl=true&amp;replicaSet=atlas-9yuzik-shard-0&authSource=admin&retryWrites=true&w=majority"/>
</appSettings>