Fiebase rules creation using c# returning System.NullReferenceException, how to fix this issue?

Question

Created the auth function for firebase rule service and called the service instance to create the firebase ruleset but it is returning System.NullReferenceException: Object reference not set to an instance of an object.What did I miss here ?

using Google.Apis.FirebaseRules.v1;
using Ruleset = Google.Apis.FirebaseRules.v1.Data.Ruleset;
using Source = Google.Apis.FirebaseRules.v1.Data.Source;
using File = Google.Apis.FirebaseRules.v1.Data.File;

private static FirebaseRulesService _firebaseRulesService;


public static void IntializeFirebaseRules() {
    GoogleCredential credential = GoogleCredential.GetApplicationDefault();
    if (CloudManager.Credential.IsCreateScopedRequired)
    {
        credential = CloudManager.Credential.CreateScoped(FirebaseRulesService.Scope.CloudPlatform);
    }
    _firebaseRulesService = new FirebaseRulesService(
    new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = CloudManager.ApplicationName

        });
}
    

 public static async  void AddRuleset()
{
    Ruleset myRuleset = new Ruleset {
    new Source {
        Files = {
        new File {
        Name = "firestore.rules",
        Content = "service cloud.firestore {" +
        "match /databases/{database}/documents {" +
        "match /users/{userId}{" +
        "allow read: if (request.auth.uid == userId);" +
        "}" +
        "match /licenses/{accountId} {" +
        "allow read: if isAccountOwner(accountId);" +
        "}" +
        "}"+
        "}",
            }
            }
        };
    };


    _firebaseRulesService.Projects.Rulesets.Create(myRuleset , "projects/" + CloudManager.ProjectId);
}

**Edited -> separated the objects as below and the NullReferenceException occurrs on the line Source mySource = new Source

File myFile =  new File {
    Name = "firestore.rules",
    Content = "service cloud.firestore {" +
    "match /databases/{database}/documents {" +
    "match /users/{userId}{" +
    "allow read: if (request.auth.uid == userId);" +
    "}" +
    "function doc(subpath) {" +
    "return get(/databases/$(database)/documents/$(subpath)).data;" +
    "}" +
    "function isAccountOwner(accountId) {" +
    "return request.auth.uid == accountId" + 
    "|| doc(/users/$(request.auth.uid)).accountId == accountId;" +
    "}" +
    "match /licenses/{accountId} {" +
    "allow read: if isAccountOwner(accountId);" +
    "}" +
    "}"+
    "}",
};
Source mySource = new Source {
    Files = {
        myFile
    }  
};
Ruleset myRuleset = new Ruleset {
    Source = mySource
};

_firebaseRulesService.Projects.Rulesets.Create(myRuleset , "projects/" + CloudManager.ProjectId);

Answer 1

This statement:

Source mySource = new Source {
    Files = {
        myFile
    }  
};

... is trying to add myFile to the Files collection - but I suspect you'll find that's null by default. You can initialize it to a list instead:

Source mySource = new Source { Files = new List<File> { myFile } };