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How to Retrieve the Oracle Connection Strings from Environment Variables


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In order to retrieve the connection strings from environment variables, the keys there must be formatted in a specific way, so they can be read from the underlying IConfiguration.


A single key-value pair is not sufficient to define the Oracle connection string and provider name, so environment should hold two separate entries - one for the connection string and one - for the provider name:

/// <summary>
/// Loads a reporting configuration from a specific JSON-based configuration file.
/// </summary>
/// <param name="environment">The current web hosting environment used to obtain the content root path</param>
/// <returns>IConfiguration instance used to initialize the Reporting engine</returns>
static IConfiguration ResolveSpecificReportingConfiguration(IWebHostEnvironment environment)
    Environment.SetEnvironmentVariable("MyOracleApp_ConnectionStrings:OracleConn:connectionString", "Data Source=reportingvista;User Id=telerik;Password=telerikpass");
    Environment.SetEnvironmentVariable("MyOracleApp_ConnectionStrings:OracleConn:providerName", "Oracle.ManagedDataAccess.Client");
    return new ConfigurationBuilder()

The first two lines just set the environment variables that contain information about the connection and provider name. Note the specific colon character (:)that acts as a delimiter between the keys hierarchy. MyOracleApp_ is used as a prefix by which the environment variables will be filtered fromthe rest.

The method ResolveSpecificReportingConfiguration must be called in the Startup.cs like this:

// Configure dependencies for ReportsController.
services.TryAddSingleton<IReportServiceConfiguration>(sp =>
    new ReportServiceConfiguration

        // In case the ReportingEngineConfiguration needs to be loaded from a specific configuration file, use the approach below:
        ReportingEngineConfiguration = ResolveSpecificReportingConfiguration(this.WebHostEnvironment),
        HostAppId = "Html5DemoAppCore3",
        Storage = new FileStorage(),
        ReportSourceResolver = new TypeReportSourceResolver().AddFallbackResolver(
                            new UriReportSourceResolver(reportsPath))

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