C#•14mo ago•

24 replies

Overriding appsettings.json section with environment variable

Given a configuration section called

Tenants

Tenants

, I'd like to override it with a whole JSON structure via an environment variable.

Given I want this

"Tenants": {
  "ByCode": {
    "11": {
      "Name": "acme"
    },
    "42": {
      "Name": "silver"
    }
  }
}

"Tenants": {
  "ByCode": {
    "11": {
      "Name": "acme"
    },
    "42": {
      "Name": "silver"
    }
  }
}

I'm doing

export Tenants='{"ByCode": {"11": {"Name": "acme"}, "42": {"Name": "silver"}}}'

export Tenants='{"ByCode": {"11": {"Name": "acme"}, "42": {"Name": "silver"}}}'

I'm trying to bind it against an object with the options pattern:

builder.Services.Configure<TenantsOptions>(
        builder.Configuration.GetSection(TenantsOptions.SectionName));

builder.Services.Configure<TenantsOptions>(
        builder.Configuration.GetSection(TenantsOptions.SectionName));

And the classes look like:

public class TenantsOptions
{
    public const string SectionName = "Tenants";

    public Dictionary<string, Tenant> ByCode { get; set; } = new();
}

public class Tenant
{
    public string Name { get; set; }
}

public class TenantsOptions
{
    public const string SectionName = "Tenants";

    public Dictionary<string, Tenant> ByCode { get; set; } = new();
}

public class Tenant
{
    public string Name { get; set; }
}

When I run the ASP.NET Core app, the

ByCode

ByCode

dictionary is empty. But if I just paste the JSON section in appsettings.json, it's correctly populated.

For the record, I can see the whole structure if I just log

builder.Configuration.GetSection(TenantsOptions.SectionName).Value;

builder.Configuration.GetSection(TenantsOptions.SectionName).Value;

, but for some reason, I guess it's only interpreted as a string, and not correctly deserialized and bound to

TenantOptions

TenantOptions

?

So how do you actually override a whole section with a JSON value through an environment variable?

Overriding appsettings.json section with environment variable

Given a configuration section called

Tenants

Tenants

, I'd like to override it with a whole JSON structure via an environment variable.

Given I want this

"Tenants": {
  "ByCode": {
    "11": {
      "Name": "acme"
    },
    "42": {
      "Name": "silver"
    }
  }
}

"Tenants": {
  "ByCode": {
    "11": {
      "Name": "acme"
    },
    "42": {
      "Name": "silver"
    }
  }
}

I'm doing

export Tenants='{"ByCode": {"11": {"Name": "acme"}, "42": {"Name": "silver"}}}'

export Tenants='{"ByCode": {"11": {"Name": "acme"}, "42": {"Name": "silver"}}}'

I'm trying to bind it against an object with the options pattern:

builder.Services.Configure<TenantsOptions>(
        builder.Configuration.GetSection(TenantsOptions.SectionName));

builder.Services.Configure<TenantsOptions>(
        builder.Configuration.GetSection(TenantsOptions.SectionName));

And the classes look like:

public class TenantsOptions
{
    public const string SectionName = "Tenants";

    public Dictionary<string, Tenant> ByCode { get; set; } = new();
}

public class Tenant
{
    public string Name { get; set; }
}

public class TenantsOptions
{
    public const string SectionName = "Tenants";

    public Dictionary<string, Tenant> ByCode { get; set; } = new();
}

public class Tenant
{
    public string Name { get; set; }
}

When I run the ASP.NET Core app, the

ByCode

ByCode

dictionary is empty. But if I just paste the JSON section in appsettings.json, it's correctly populated.

For the record, I can see the whole structure if I just log

builder.Configuration.GetSection(TenantsOptions.SectionName).Value;

builder.Configuration.GetSection(TenantsOptions.SectionName).Value;

, but for some reason, I guess it's only interpreted as a string, and not correctly deserialized and bound to

TenantOptions

TenantOptions

?

So how do you actually override a whole section with a JSON value through an environment variable?

Overriding appsettings.json section with environment variable

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