ConfigurationSettings.AppSettings is obsolete, warning

Question

var values = new NameValueCollection
{
    { "key", ConfigurationSettings.AppSettings["API-Key"].ToString() },
    { "image", Convert.ToBase64String(File.ReadAllBytes(photo.ToString())) }
};

What's the new way to use the app.config file?

Possible duplicate of [The name 'ConfigurationManager' does not exist in the current context](http://stackoverflow.com/questions/1274852/the-name-configurationmanager-does-not-exist-in-the-current-context) — Matt, Dec 20 '16 at 09:25

score 18 · Accepted Answer · edited Jan 29 '18 at 15:05

18

The ConfigurationManager class in System.Configuration:

ConfigurationManager.AppSettings

ConfigurationManager.ConnectionStrings

So your code would change to:

var values = new NameValueCollection 
{ 
    { "key", ConfigurationManager.AppSettings["API-Key"] }, 
    { "image", Convert.ToBase64String(File.ReadAllBytes(photo.ToString())) } 
};

Make sure you add a reference to System.Configuration along with the using statement for System.Configuration.

edited Jan 29 '18 at 15:05

mason

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answered Aug 10 '10 at 16:25

Kelsey

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If you can't see ConfigurationManager then please refer to this link: http://stackoverflow.com/questions/1274852/the-name-configurationmanager-does-not-exist-in-the-current-context – John M Jul 04 '16 at 14:18

score 7 · Answer 2 · edited Jan 29 '18 at 15:06

7

Use the System.Configuration.ConfigurationManager class

string ServerName = System.Configuration.ConfigurationManager.AppSettings["Servername"];

Edit - added

Note, you may have to add a reference to System.Configuration.dll. Even if you can import the namespace without the reference, you will not be able to access this class unless you have the reference.

edited Jan 29 '18 at 15:06

mason

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answered Aug 10 '10 at 16:25

David

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That's really strange, I System.Configuration namespace imported, but the ConfigurationManager class still shows up red. It's like it's not a part of the namespace. Any suggestions? I tried right-clicking and resolve, but no dice. – Sergio Tapia Aug 10 '10 at 16:27
1

See my added note. That threw me the first time as well. I think it took me a half an hour to figure it out. – David Aug 10 '10 at 16:28

score 3 · Answer 3 · answered Aug 10 '10 at 16:24

3

With the ConfigurationManager class

http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.aspx

answered Aug 10 '10 at 16:24

Eton B.

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score 2 · Answer 4 · answered Aug 10 '10 at 16:25

2

The new class to use is the ConfigurationManager class.

answered Aug 10 '10 at 16:25

Adam V

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ConfigurationSettings.AppSettings is obsolete, warning

4 Answers4

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