什么会导致GetFileAsync挂起?

问题描述

我有一个适用于Windows Store应用程序(aka Metro)的简单实用程序集合，但是我发现连续调用ApplicationData.Current.LocalFolder.GetFileAsync时它似乎挂起了(即，当我尝试调试并逐步执行时)通过，问题消失了.)

I've got a simple utility collection for a Windows Store application (a.k.a Metro), but I'm finding that it seems to hang when calling ApplicationData.Current.LocalFolder.GetFileAsync in succession (i.e. as soon as I try to debug it and step through, the problem disappears).

    public static async Task<LocalCache<T>> LoadCache()
    {
        try
        {
            // Get the input stream for the cache
            StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync(GetFileNameForType());
            using (IInputStream inStream = await file.OpenSequentialReadAsync())
            {
                // Deserialize the cache
                DataContractSerializer serializer = new DataContractSerializer(typeof(LocalCache<T>));
                return (LocalCache<T>)serializer.ReadObject(inStream.AsStreamForRead());
            }
        }
        catch (FileNotFoundException)
        {
            return new LocalCache<T>();
        }
    }

指定打开文件的模式似乎没有任何重载，并且似乎没有返回，这让我有些困惑.我该如何防止这种僵局?

There doesn't appear to be any overload to specify a mode to open the file in, and it doesn't appear to return, which has left me kinda stumped. What can I do prevent this deadlock?

推荐答案

最可能的原因是您的调用堆栈更深了.我猜想可能有对Wait或Result的调用.此将导致死锁(如我的博客).

The most likely cause of this is further up your call stack; I'm guessing there is probably a call to Wait or Result. This will result in deadlock (as described on my blog).

如果由于这是初始化或构造函数的一部分而被阻止，则您可能对异步延迟初始化(也在我的博客中进行了介绍).

If you're blocking because this is part of initialization or a constructor, then you may be interested in asynchronous lazy initialization (also described on my blog).

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