如何在Windows Store应用程序中复制文件夹

Question

如何在Windows Store应用程序中复制文件夹及其内容?

我正在为Windows Store应用程序编写测试。该应用程序使用文件进行操作，因此需要一组已知文件。理想情况下，任何开发人员都可以运行这些测试，而不需要进行手动设置。

我认为这意味着测试文件将被签入源代码控制，然后复制到LocalState文件夹，测试可以使用它们(在ClassInitialize测试阶段复制)。

StorageFile具有复制功能。可以使用这些来递归地重新构建要复制的文件夹。然而，很难相信这是正确的方法……

Answer 1

这是粗略的，没有经过彻底的测试。它递归地复制文件夹。对于名称冲突，它将覆盖现有的文件和文件夹。

    public static async Task CopyAsync(
        StorageFolder source, 
        StorageFolder destination)
    {
        // If the destination exists, delete it.
        var targetFolder = await destination.TryGetItemAsync(source.DisplayName);
        if (targetFolder is StorageFolder)
            await targetFolder.DeleteAsync();
        targetFolder = await destination.CreateFolderAsync(source.DisplayName);
        // Get all files (shallow) from source
        var queryOptions = new QueryOptions
        {
            IndexerOption = IndexerOption.DoNotUseIndexer,  // Avoid problems cause by out of sync indexer
            FolderDepth = FolderDepth.Shallow,
        };
        var queryFiles = source.CreateFileQueryWithOptions(queryOptions);
        var files = await queryFiles.GetFilesAsync();
        // Copy files into target folder
        foreach (var storageFile in files)
        {
            await storageFile.CopyAsync((StorageFolder)targetFolder, storageFile.Name, NameCollisionOption.ReplaceExisting);
        }
        // Get all folders (shallow) from source
        var queryFolders = source.CreateFolderQueryWithOptions(queryOptions);
        var folders = await queryFolders.GetFoldersAsync();
        // For each folder call CopyAsync with new destination as destination
        foreach (var storageFolder in folders)
        {
            await CopyAsync(storageFolder, (StorageFolder)targetFolder);
        }
    }

拜托，有人有更好的答案。复制一个文件夹应该是对测试过的。net API的一行调用。我们不应该都编写自己的函数或从互联网上复制粘贴未经测试的代码。

Answer 2

这是我复制文件夹的版本，如果在IStorageFolder上有3个扩展方法:

1. 所有文件和文件夹的浅拷贝
2. 所有文件和文件夹的递归副本
3. 复制文件

代码:

public static class StorageFolderExtensions
{
    /// <summary>
    /// Recursive copy of files and folders from source to destination.
    /// </summary>
    public static async Task CopyContentsRecursive(this IStorageFolder source, IStorageFolder dest)
    {
        await CopyContentsShallow(source, dest);
        var subfolders = await source.GetFoldersAsync();
        foreach (var storageFolder in subfolders)
        {
            await storageFolder.CopyContentsRecursive(await dest.GetFolderAsync(storageFolder.Name));
        }
    }
    /// <summary>
    /// Shallow copy of files and folders from source to destination.
    /// </summary>
    public static async Task CopyContentsShallow(this IStorageFolder source, IStorageFolder destination)
    {
        await source.CopyFiles(destination);
        var items = await source.GetFoldersAsync();
        foreach (var storageFolder in items)
        {
            await destination.CreateFolderAsync(storageFolder.Name, CreationCollisionOption.ReplaceExisting);
        }
    }
    /// <summary>
    /// Copy files from source into destination folder.
    /// </summary>
    private static async Task CopyFiles(this IStorageFolder source, IStorageFolder destination)
    {
        var items = await source.GetFilesAsync();
        foreach (var storageFile in items)
        {
            await storageFile.CopyAsync(destination, storageFile.Name, NameCollisionOption.ReplaceExisting);
        }
    }