How to get the file path using key from webconfig file

Question

I have JSON file stored in my D drive. I have mentioned the same in web config file. Please refer the below code

    <appSettings>
    <add key="inputFilePath" value="D:\products.json"/>
    </appSettings>

When I try to get the file path using the below code, I am getting null value.

    string filepath = ConfigurationManager.AppSettings["inputFilePath"];

Please can any one help me on this

score 0 · Answer 1 · answered Mar 07 '16 at 06:02

0

you need to call like this

string filepath = ConfigurationManager.AppSettings["inputFilePath"].ToString();

answered Mar 07 '16 at 06:02

Krsna Kishore

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I have tried using the above code but I am getting An exception of type 'System.NullReferenceException'. – anitha lm Mar 07 '16 at 06:05
@anithalm are you able to get the stringpath or is it null value? – Krsna Kishore Mar 07 '16 at 06:08
@anithalm Your implementation of it must be incorrect. This definitely works for retrieving key values from a config file. – Krsna Kishore Mar 07 '16 at 06:17

score 0 · Answer 2 · edited May 23 '17 at 12:31

Refer this - How to: Read Application Settings from the Web.config File

System.Configuration.Configuration rootWebConfig1 =
                System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(null);
            if (rootWebConfig1.AppSettings.Settings.Count > 0)
            {
                System.Configuration.KeyValueConfigurationElement customSetting = 
                    rootWebConfig1.AppSettings.Settings["customsetting1"];
                if (customSetting != null)
                    Console.WriteLine("customsetting1 application string = \"{0}\"", 
                        customSetting.Value);
                else
                    Console.WriteLine("No customsetting1 application string");
            }

//Config file

<appSettings>
  <add key="customsetting1" value="Some text here"/>
</appSettings>

You'll need to add a reference to System.Configuration in your project's references folder.

Add namespace

using System.Configuration;

then get file path

String path = ConfigurationManager.AppSettings["inputFilePath"];

More References:
AppSettings
How to read appSettings section in the web.config file?
Getting configuration settings from web.config/app.config using class library
Reading settings from app.config or web.config in .net

Hope this help.

score 0 · Answer 3 · answered Mar 07 '16 at 16:03

There's nothing wrong with your code. This suggests that the <appSettings> isn't in the executing project. For example, if you have a web project and some other class library and the class library refers to <appSettings>, that setting needs to be in the website's web.config. If your class library has its own app.config it's not going to be read. Whatever is executing - website, web forms, console app, etc, - that's where the <appSettings> needs to be, regardless of what is trying to read it.

How to get the file path using key from webconfig file

3 Answers3