Visual Studio 2015 - Change Setting or Variable at time of Publish - variables

Question

Is it possible to change a setting or variable when the application is published
or is there some sort of condition to run an IF THEN against?
for example, I want to change the way the log files are written when I publish and I often forget to make the change when I publish it

Answer 1

Web.Live.Config:
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<!--
In the example below, the "SetAttributes" transform will change the value of
"connectionString" to use "ReleaseSQLServer" only when the "Match" locator
finds an attribute "name" that has a value of "MyDB".
-->
<appSettings>
<add key="ClaimPackPath" value="C:\\inetpub\\wwwroot\\Application\\ClaimPacks\\" xdt:Locator="Match(key)" xdt:Transform="Replace" />
</appSettings>
</configuration>
Wg.Debug.Config:
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<!--
In the example below, the "SetAttributes" transform will change the value of
"connectionString" to use "ReleaseSQLServer" only when the "Match" locator
finds an attribute "name" that has a value of "MyDB".
-->
<appSettings>
<add key="ClaimPackPath" value="C:\\Debug\\wwwroot\\Application\\ClaimPacks\\" xdt:Locator="Match(key)" xdt:Transform="Replace" />
</appSettings>
</configuration>
Then in the application you can request the variable like so :
string filepath = ConfigurationManager.AppSettings["ClaimPackPath"];
And it will change for whatever publish profile you choose at time of publish :)