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Question.Net Core 6 - IMongoCollection, Suppression State Warning CS8602 Dereference of a possibly null reference. Pin
jkirkerx16-May-23 17:56
professionaljkirkerx16-May-23 17:56 
Been some years now since I worked with .Net Core 3, been busy with PHP 8, and was surprised at the new stuff in .Net Core 6, and it's insatiable appetite to point out null conditions, so I'm playing along with it for now. But I just can't wrap my head around this one, and I'm starring at it like a deer in the headlights. So I asked VS 2022 for suggestions, and it suggested converting my old code to these new statements. I read the documentation .. Resolve nullable warnings | Microsoft Learn and I didn't see any anything that sort of matched what I'm doing here. I tried ...

Right hand side ?? "_database maybe null" but it said that it can't be applied to operands of type IMongoCollection<account> and strings.

Perhaps someone else has run into this and can give me a pointer or a solid. But I'll keep researching this to see if I can find something.

My old code example from .Net Core 3
C#
<br />
public IMongoCollection<ACCOUNTS> Accounts
{
    get { return _database.GetCollection<ACCOUNTS>("Accounts"); }
}<br />

My new code that VS 2022 Suggested
C#
internal class MongoDbContext : IDisposable
{
    private IMongoDatabase? _database;

<pre>
public void MongoDBContext()
{

    // Grab the MongoDB Connection and Database
    var rootObject = AppSettingsJson.GetSettings();
    var dbConnection = rootObject?.Settings?.DbConnection;
    var connString = "mongodb://" + dbConnection?.User + ":" + dbConnection?.Pass + "@" + dbConnection?.Host;
    var client = new MongoClient(connString);
    _database = client.GetDatabase(dbConnection?.Database);

}

// MongoDB Database Models        
// I don't understand how to perform a null check, or to satisfy the compiler for "_database" - _database may be null here CS8602
public IMongoCollection<ACCOUNTS> Accounts => _database.GetCollection<ACCOUNTS>("Accounts");
public IMongoCollection<SHIPPERS> Shippers => _database.GetCollection<SHIPPERS>("Shippers");
public IMongoCollection<CONTACTS> Contacts => _database.GetCollection<CONTACTS>("Contacts");
public IMongoCollection<PALLETS> Pallets => _database.GetCollection<PALLETS>("Pallets");
public IMongoCollection<CUSTOMERS> Customers => _database.GetCollection<CUSTOMERS>("Customers");
public IMongoCollection<BILLOFLADING> BillOfLading => _database.GetCollection<BILLOFLADING>("BillOfLading");
public IMongoCollection<SHIPPINGADDRESSES> ShippingAddresses => _database.GetCollection<SHIPPINGADDRESSES>("ShippingAddresses");

public IMongoCollection<countries> Countries => _database.GetCollection<countries>("Countries");

}

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AnswerI think I got it Pin
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