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The connection string is missing
Learn how to troubleshoot the error "ConnectionString is missing" during execution of your app.
07/03/2024

Connection string is missing

In .NET Aspire, code identifies resources with an arbitrary string, such as "database". Code that is consuming the resource elsewhere must use the same string or it will fail to correctly configure their relationships.

Symptoms

When your app accesses a service that needs one of the components in your app, it may fail with an exception similar to the following:

"InvalidOperationException: ConnectionString is missing."

Possible solutions

Verify that the name of the resource, for instance a database resource, is the same in the AppHost and the Service that fails.

For example, if the AppHost defines a PostgreSQL resource with the name db1 like this:

var db1 = builder.AddPostgres("pg1").AddDatabase("db1");

Then the service needs to resolve the resource with the same name db1.

var builder = WebApplication.CreateBuilder(args);

builder.AddNpgsqlDbContext<MyDb1Context>("db1");

Any other value than the one provided in the AppHost will result in the exception message described above.