ASP.NET 5 Config File not opening

Question

I've created a static class to use my configurations, but when I try to add the JSON file to the configuration I got an exception:

MyConfigurations.json:

{ "ConnectionString": "my connection string", ...}

My static class constructor:

static MyConfigurations() {
    var configuration = new Configuration()
        .AddJsonFile("MyConfigurations.json")
        .AddEnvironmentVariables();
    ...
    ...

My exception occurs when the .AddJsonFile is executed.

Exception: Object reference not set to an instance of an object."

StackTrace:

at Microsoft.Framework.ConfigurationModel.PathResolver.get_ApplicationBaseDirectory() at Microsoft.Framework.ConfigurationModel.JsonConfigurationExtension.AddJsonFile(IConfigurationSourceRoot configuration, String path, Boolean optional) at Microsoft.Framework.ConfigurationModel.JsonConfigurationExtension.AddJsonFile(IConfigurationSourceRoot configuration, String path) at Project.SharedKernel.MyConfigurations..cctor() in C:\Project\Project.SharedKernel\MyConfigurations.cs:line 86

Does anyone mind sharing why they downvoted? – mason Oct 26 '15 at 13:31 — mason, Oct 26 '15 at 13:31

score 2 · Accepted Answer · edited May 23 '17 at 11:59

2

You have not set the application base path which the configuration API needs to determine where the physical config files live. You can set it using the SetBasePath extension method. A typical implementation looks like this:

public Startup(IApplicationEnvironment appEnv)
{
    var configuration = new ConfigurationBuilder()
        .SetBasePath(appEnv.ApplicationBasePath)
        .AddJsonFile("MyConfigurations.json")
        .AddEnvironmentVariables()
        .Build();
}

Note: this only counts for beta8, see this question. You don't have to specify the default base path anymore in RC1: https://github.com/aspnet/Announcements/issues/88.

edited May 23 '17 at 11:59

Community

1
1

answered Oct 26 '15 at 13:25

Henk Mollema

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I'm trying to load this configuration in another project, in a class library with a static class to be shared with all projects of my solution, there is a way to work in this scenary? – Cesar Oct 26 '15 at 13:47
Just as a note: In RC1 the base bath is not longer needed: https://github.com/aspnet/Announcements/issues/88 – Juergen Gutsch Oct 26 '15 at 13:53
1

@Cesar I think your best option is to pass the `IApplicationEnvironment.ApplicationBasePath` to the static class. – Henk Mollema Oct 26 '15 at 13:57

ASP.NET 5 Config File not opening

1 Answers1