Azure Cosmos DB - 如何在不同的控制器中使用不同的容器 Id 實例化 Cosmos Db

Question

我正在使用 .net 6

我正在嘗試使用 CosmosDb 並且我正在學習本教程。 問題是它們僅基於在appsettings.json中設置的容器 ID 進行實例化

Program.cs 是這樣的

static async Task<CosmosDbService> InitializeCosmosClientInstanceAsync(IConfigurationSection configurationSection)
{
    var databaseName = configurationSection["DatabaseName"];
    var containerName = configurationSection["ContainerName"];
    var account = configurationSection["Account"];
    var key = configurationSection["Key"];
    var client = new CosmosClient(account, key);
    var database = await client.CreateDatabaseIfNotExistsAsync(databaseName);
    await database.Database.CreateContainerIfNotExistsAsync(containerName, "/id");
    var cosmosDbService = new CosmosDbService(client, databaseName, containerName);
    return cosmosDbService;
}

builder.Services.AddSingleton<ICosmosDbService>(InitializeCosmosClientInstanceAsync(builder.Configuration.GetSection("CosmosDb")).GetAwaiter().GetResult());

這就是 controller 的樣子：

namespace demoCosmoDB.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class UserController : Controller
    {
        private readonly ICosmosDbService _cosmosDbService;

        public UserController(ICosmosDbService cosmosDbService)
        {
            _cosmosDbService = cosmosDbService ?? throw new ArgumentNullException(nameof(cosmosDbService));
        }
        [HttpGet]
        [Route("{Id:int}")]
        public async Task<IActionResult> GetUser(string Id)
        {
            return Ok(await _cosmosDbService.GetUser(Id));
        }
    }
}

DbService 只是一個關於實現什么的接口：

假設我有另一個 controller ArticleController，如何使用 contaienr id 例如“文章”實例化？

我試過了：

static async Task<CosmosClient> InitializeCosmosClientInstanceAsync(IConfigurationSection configurationSection)
{
    var account = configurationSection["Account"];
    var key = configurationSection["Key"];
    var client = new CosmosClient(account, key);
    return client;
}

但是不知如何修改rest：

builder.Services.AddSingleton<ICosmosDbService>(InitializeCosmosClientInstanceAsync(builder.Configuration.GetSection("CosmosDb")).GetAwaiter().GetResult()); 
....

Answer 1

請不要為每個 Container 創建一個客戶端實例。 創建單個CosmosClient實例並使用它訪問同一帳戶中的任何和所有容器。

例如：

static CosmosClient InitializeCosmosClientInstance(IConfigurationSection configurationSection)
{
    var account = configurationSection["Account"];
    var key = configurationSection["Key"];
    var client = new CosmosClient(account, key);
    return client;
}

builder.Services.AddSingleton<CosmosClient>(InitializeCosmosClientInstance(builder.Configuration.GetSection("CosmosDb")));

namespace demoCosmoDB.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class UserController : Controller
    {
        private readonly Container _cosmosContainer;

        public UserController(CosmosClient cosmosClient)
        {
            if (cosmosClient == null) {
                throw new ArgumentNullException(nameof(cosmosClient));
            }

            _cosmosContainer = cosmosClient.GetContainer("dbName", "containerName");
            // you can have different containers for different controllers
        }
        [HttpGet]
        [Route("{Id:int}")]
        public async Task<IActionResult> GetUser(string Id)
        {
           // use the Container to perform your operations
        }
    }
}