How to override appsettings.json with environment variables?

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How to override appsettings.json with environment variables for connection string in onconfiguring method in dbcontext class in ASP.NET Core 3.0 project ?

What I have tried:

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
if (!optionsBuilder.IsConfigured)
{
IConfigurationRoot configuration = new ConfigurationBuilder()
.SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
.AddJsonFile("appsettings.json")
.Build();
optionsBuilder.UseSqlServer(configuration.GetConnectionString("UserDBContext"));
 }
}

Posted 30-Jan-20 20:35pm

SanketLodha

Updated 31-Jan-20 2:26am

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Richard Deeming · Accepted Answer · 2020-01-31T02:26:00

Configuration in ASP.NET Core | Microsoft Docs[^]
EnvironmentVariablesExtensions.AddEnvironmentVariables Method (Microsoft.Extensions.Configuration) | Microsoft Docs[^]

C#

IConfigurationRoot configuration = new ConfigurationBuilder()
    .SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
    .AddJsonFile("appsettings.json")
    .AddEnvironmentVariables(prefix: "YOUR_APP_PREFIX_")
    .Build();

You can now override the connection string by setting the environment variable YOUR_APP_PREFIX_UserDbContext.