c# - Getting the default firebaseapp already exists in .NET Core while sending notifications - Stack Overflow

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We have implemented the notifications and it works fine when we do the regular testing. However, when concurrent users uses the same API then we get below error.

The default firebaseapp already exists. However, by checking the solution on the internet, we have implemented the below solution in the class constructor

if (FirebaseApp.DefaultInstance == null)
{
    FirebaseApp.Create(new AppOptions()
    {
        Credential = GoogleCredential.FromJson(JsonConvert.SerializeObject(<Passing Firebase Config here>))
    });
}

Then sending the notification using this code:

string result = await FirebaseMessaging.DefaultInstance.SendAsync(message);

Still we are getting the error as default FirebaseApp already exists.

Any help on this is appreciated!

We have implemented the notifications and it works fine when we do the regular testing. However, when concurrent users uses the same API then we get below error.

The default firebaseapp already exists. However, by checking the solution on the internet, we have implemented the below solution in the class constructor

if (FirebaseApp.DefaultInstance == null)
{
    FirebaseApp.Create(new AppOptions()
    {
        Credential = GoogleCredential.FromJson(JsonConvert.SerializeObject(<Passing Firebase Config here>))
    });
}

Then sending the notification using this code:

string result = await FirebaseMessaging.DefaultInstance.SendAsync(message);

Still we are getting the error as default FirebaseApp already exists.

Any help on this is appreciated!

• c#
• firebase
• asp-core
• -core
• firebase-admin

Share Improve this question Follow edited Nov 18, 2024 at 14:11 marc_s 757k184184 gold badges1.4k1.4k silver badges1.5k1.5k bronze badges asked Nov 18, 2024 at 14:03 XamDevXamDev 3,6771313 gold badges6363 silver badges104104 bronze badges

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1 Answer 1

Sorted by: Reset to default 0

import firebase_admin
from firebase_admin import credentials, firestore

class FirebaseManager:
    def __init__(self):
        if not firebase_admin._apps:
            cred = credentials.Certificate('path/to/your/serviceAccountKey.json')
            firebase_admin.initialize_app(cred, {
                'databaseURL': 'https://your-database-url.firebaseio'
            })
        self.db = firestore.client()

# Usage

firebase_manager = FirebaseManager()

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