Support for Azure App Settings

[sayedihashimi]

We have first class support for connection strings defined in Azure Web Apps (formerly Azure Web Sites) which translates env vars with name like

SQLAZURECONNSTR_DefaultConnection
SQLCONNSTR_sqlservercs
CUSTOMCONNSTR_customcs
MYSQLCONNSTR_mysqlhere

To be compatible with the Configuration object. The code which does this is here.

We should have the same for app settings. In Azure Web Apps when you create an app setting two env vars are created, in the form <env-var-name> = <value> and APPSETTING_<env-var-name>=<value>. When a user defines a new env var in the portal they should be able to use the AppSettings class in the project that VS creates or Configuration.Get("AppSettings:SettingName") to get the value.

Today users can get to the value but they cannot use the AppSettings class, but instead something like Configuration.Get("SettingName").

[divega]

In #376 we are proposing to move to a model in which we don't prepend prefixes to names of keys for connection strings for Azure Web Apps. If we do that, we shouldn't do what this item describes either.