c# - Azure Function CosmosDBInput Binding 不返回值

Question

我有以下 Azure 功能:

private const string PartitionKey = "/westus2";

public class League
{
    public string id { get; set; }

    public string Description { get; set; }

    public List<string> GameIds { get; set; }
}

[Function("AddGame")]
public async Task<AddGameMultiResponse> AddGame(
    [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = "addgame/{leagueId}")] HttpRequestData req,
    [CosmosDBInput(databaseName: "MyDB",
        collectionName: "Leagues",
        PartitionKey = PartitionKey,
        ConnectionStringSetting = "CosmosDbConnectionString")] IEnumerable<League> leagues,
    [CosmosDBInput(databaseName: "MyDB",
        collectionName: "Leagues",
        Id = "{leagueId}",
        PartitionKey = PartitionKey,
        ConnectionStringSetting = "CosmosDbConnectionString")] League league)
{
}

当我通过 Postman 使用以下 URI 调用它时:

http://localhost:7071/api/addgame/5fa8c927-15ad-4fd2-8b9d-4d7b11723021

我看到联赛有一项具有属性:

id [string]: "5fa8c927-15ad-4fd2-8b9d-4d7b11723021"

然而联赛为空。查看数据浏览器，我看到:

我在这里做错了什么？

编辑:看起来这可行:

   [CosmosDBInput(databaseName: "MyDB",
        collectionName: "Leagues",
        PartitionKey = PartitionKey,
        ConnectionStringSetting = "CosmosDbConnectionString",
        SqlQuery = "SELECT * from c WHERE c.id = {leagueId}")] IEnumerable<League> matchingLeagues

所以现在我觉得 CosmosDBInput 绑定(bind)中一定存在错误......

Answer 1

PartitionKey 可能是这里的关键。您传递的值是什么？

单个项目读取:

[CosmosDBInput(databaseName: "MyDB",
        collectionName: "Leagues",
        Id = "{leagueId}",
        PartitionKey = PartitionKey,
        ConnectionStringSetting = "CosmosDbConnectionString")] League league)

需要 Id 和 PartitionKey 才能找到该项目。您获得了 Id，但是 PartitionKey 又如何呢？容器是否按/id分区？如果是，则 PartitionKey 还应具有 "{leagueId}"。

League league 为 null 的原因很简单，就是您设置的 Id/PartitionKey 值与现有文档不匹配。