Question

我是Windows Store App开发的新手，我有一个用C＃编写的应用程序，它试图获取指定目录及其子目录中所有文件的大小。 StorageFolder.GetFilesAsync（）方法适用于具有少量文件的目录，但是对于包含大量文件的目录，它在仅具有2GB RAM的设备上产生OOM异常，例如许多RT平板电脑。有没有办法解决这个问题，这将允许应用程序以较小的块处理文件，而不是构建所有文件的列表（这似乎非常低效），如下面的代码所示，任何帮助将不胜感激...... < / p>

StorageFolderQueryResult queryResult = KnownFolders.RemovableDevices.CreateFolderQueryWithOptions(new QueryOptions(CommonFolderQuery.DefaultQuery));

folderList = await queryResult.GetFoldersAsync();
foreach (StorageFolder folder in folderList)
{
    IReadOnlyList<StorageFile> fileList = await folder.GetFilesAsync(CommonFileQuery.DefaultQuery);

    foreach (StorageFile file in fileList)
    {
        BasicProperties properties = await file.GetBasicPropertiesAsync();
        size += properties.Size;
    }
}

Answer 1

使用StorageFolderQueryResult.GetFoldersAsync(uint, uint)和StorageFolderQueryResult.GetItemCountAsync一起查询文件夹中的文件夹。

类似的东西：

StorageFolderQueryResult queryResult = KnownFolders.RemovableDevices.CreateFolderQueryWithOptions(new QueryOptions(CommonFolderQuery.DefaultQuery));

uint numItems = await queryResult.GetItemCountAsync();
uint chunkSize = 50;

for(uint startingIndex = 0; startingIndex < numItems; startingIndex += chunkSize)
{
    var folderList = await queryResult.GetFoldersAsync(startingIndex, chunkSize);
    foreach (StorageFolder folder in folderList)
    {
        IReadOnlyList<StorageFile> fileList = await folder.GetFilesAsync(CommonFileQuery.DefaultQuery);

        foreach (StorageFile file in fileList)
        {
            BasicProperties properties = await file.GetBasicPropertiesAsync();
            size += properties.Size;
        }
    }
}

您可以根据想要约束记忆的方式增加或减少chunkSize。

希望这会有所帮助。快乐的编码！

Windows应用商店应用StorageFolder.GetFilesAsync（）导致OOM异常

1 个答案: