Cosmos db文档以较低版本读取字符串

using Microsoft.Azure.Cosmos;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        string endpointUrl = "https://your-cosmos-db-endpoint.documents.azure.com:443/";
        string primaryKey = "your-primary-key";
        string databaseName = "your-database-name";
        string containerName = "your-container-name";

        CosmosClient cosmosClient = new CosmosClient(endpointUrl, primaryKey);
        Database database = cosmosClient.GetDatabase(databaseName);
        Container container = database.GetContainer(containerName);

        QueryDefinition query = new QueryDefinition("SELECT * FROM c");
        FeedIterator<Document> queryResultSetIterator = container.GetItemQueryIterator<Document>(query);

        while (queryResultSetIterator.HasMoreResults)
        {
            FeedResponse<Document> currentResultSet = await queryResultSetIterator.ReadNextAsync();
            foreach (Document doc in currentResultSet)
            {
                // 处理文档结构变化
                if (doc.Contains("newField"))
                {
                    // 处理新字段
                    string newFieldValue = doc.GetPropertyValue<string>("newField");
                    Console.WriteLine($"New Field Value: {newFieldValue}");
                }
                else
                {
                    // 处理旧版本文档
                    Console.WriteLine("Old Version Document");
                }
            }
        }
    }
}