c# - Mongodb C# Driver 2.0 同步计数器

Question

我需要使用尚未切换到异步的旧 Controller 来计算与过滤器匹配的项目。我们有一个 async answer关于如何做到这一点:

long result = await collection.CountAsync(Builders<Hamster>.Filter.Eq(_ => _.Name, "bar"));

我还找到了一篇文章Introducing the 2.0 .NET Driver在 MongodDb 网站上有一条评论似乎证实了这是不可能的:

3. It's async only: That's true. There has been a trend for new APIs to be async only (e.g. Microsoft's HttpClient). In general async programming is easy and results in higher server throughput without requiring a large number of threads. We are considering whether we should also support a sync API, and while we have gotten some requests for it (yours included) in general users seem eager to use async programming.

尽管如此，我想问一下是否有办法做到这一点/确认如果不使 Controller 方法异步(及其所有助手)是不可能的。

Answer 1

从驱动程序的 v2.2 开始，所有异步方法都有同步重载，因此您应该使用它们而不是阻塞在异步 API 上。这样做会降低性能并可能导致死锁:

long countOfItemsMatchingFilter = yourCollectionName.Count(yourFilterName);