CODEWITHSUNDEEP
asp.net-mvcasp.net-mvc-3web-configmedium-trust
YodasMyDad
YodasMyDad

Reputation: 9485

Unable To Edit AppSetting In Web.Config In Medium Trust?

I am trying to update an appSetting in the web.config in an MVC3 app running in medium trust. It fails as soon as I try to call?

var config = WebConfigurationManager.OpenWebConfiguration("~");

Tried other variations but they all seem to throw this error.

System.Security.Permissions.FileIOPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089′ failed.

Anyone know how to do it in medium trust? Any help would be greatly appreciated.

Upvotes: 0

Views: 359

Answers (2)

YodasMyDad
YodasMyDad

Reputation: 9485

Here is a method for doing it in medium trust

http://www.mvcforum.com/blog/2012/9/updating-appsettings-in-the-webconfig-in-medium-trust/

Upvotes: 0

Jamie Howarth
Jamie Howarth

Reputation: 3323

Short answer: it's not possible in Medium Trust.

Long answer: the web.config actually inherits a bunch of settings down from the machine-level web.configs. As a result, when you access the Configuration & AppSettings classes from opening a given .config file, it's read-only (cause that's what the system lets you do), but will throw the FileIO permission when trying to write, as the classes have to determine somewhere up the call stack that they have permission to write to the correct config (folder, inherited, or machine-level) prior to writing your new setting (depending on where the setting was set in the inheritance hierarchy). N.B. This was meant to be fixed in .NET4... I remember seeing a link on the Microsoft Connect site somewhere about it.

Summary: Use XML/XSLT parsing.

Upvotes: 2

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