根據這個基于節點的問題的答案，將自動創建集合，但即使如此，您如何做到這一點并不容易，尤其是在 .NET 中。如果它是樹下的多個集合，則更是如此。例如，這是我們將嘗試添加的文檔類：

using Google.Cloud.Firestore;

namespace FirestoreTest.Models

{

    [FirestoreData]

    public class ClassicGame

    {

        public ClassicGame()

        {

        }

        [FirestoreProperty]

        public string title { get; set; }

        [FirestoreProperty]

        public string publisher { get; set; }

    }

}

這是一個示例函數，用于檢查集合和文檔是否存在于 PC/Games/{publisher}/{title} 中，如果不存在，則使用 gameId 作為文檔的 ID 創建它。它使用 Google.Cloud.Firestore和Google.Cloud.Firestore.V1Beta1

public async Task<bool> AddPcGame(string gameTitle, string gamePublisher, string gameId)

        {

            string publisherCollectionPath = "PC/Games/" + gamePublisher;

            //Try and get the document and check if it exists

            var document = await db.Collection(publisherCollectionPath).Document(gameId).GetSnapshotAsync();

            if (document.Exists)

            {

                //document exists, do what you want here...

                return true;

            }

             //if it doesn't exist insert it:  

            //create the object to insert

            ClassicGame newGame = new ClassicGame()

            {

                title = gameTitle,

                publisher = gamePublisher

            };

            //Notice you have to traverse the tree, going from collection to document.  

            //If you try to jump too far ahead, it doesn't seem to work. 

            //.Document(gameId).SetAsync(newGame), is what set's the document's ID and inserts the data for the document.

            CollectionReference collection = db.Collection("PC");

            var document2 = await collection.Document("Games").Collection(gamePublisher).Document(gameId).SetAsync(newGame);

            return true;

        }