not able to read configurations from appsettings.json in Blazor pre-rendering app

Question

please see this link for a detailed description on the problem

Please let me know if there is anything that can object from retrieving this appsettings.json file data in Blazor Web assembly pre-rendering.

Answer 1

Hi @Keerthi Mettu ,

I wrote a demo, you can refer to it and you can read the value.
I first added the test attribute in appsetings.json.

 "MySettings": {  
    "DbConnection": "abc",  
    "Email": "abc@domain.com",  
    "SMTPPort": "5605"  
  }  

Now, in our ConfigController, we will add a private field of type “IConfiguration” which is found in Microsoft.Extensions.

public class ConfigController : Controller  
    {  
        private IConfiguration configuration;  
        public ConfigController(IConfiguration iConfig)  
        {  
            configuration = iConfig;  
        }  
        public IActionResult Index()  
        {  
  
            string dbConn = configuration.GetSection("MySettings").GetSection("DbConnection").Value;  
            
              
              
            return View();  
        }  

Rseult:

Choose the corresponding field for any attribute you need, or you can define a model to get it all at once.

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Best Regards,

ChaoDeng

Answer 2

Hi @Chao Deng-MSFT , thank you for your response. In my Blazor project, I don't have a controller rather a database connection management service class. But if you see in the following code, none of those variables (c, con, connectionstr) are providing a value instead of null. Can you please let me know if there is anything I'm missing.

 public class DataAccessors  
    {  
        private readonly IConfiguration Configuration;  
  
        public DataAccessors(IConfiguration configuration)  
        {  
            Configuration = configuration;  
        }  
        public DataAccessors()  
        {  
        }  
        public MySqlConnection CSONLINE_MySqlConnection()  
        {         
           string c =  Configuration.GetConnectionString("localDevDb");  
           // string con =  ConfigurationManager.ConnectionStrings["localDevDb"].ConnectionString;   
           var connectionstr = ConfigurationManager.AppSettings["ConnectionStrings.localDevDb"];  
            string conStr = "server=localhost;database=db.........port=3306";  
            using (MySqlConnection mysqlConnection = new MySqlConnection(conStr))  
            {  
                return mysqlConnection;  
            }  
        }  
}