/// <summary>
/// 构造一个 <see cref="PhysicalStorageDirectoryContents"/>。
/// </summary>
/// <param name="contents">给定的 <see cref="IDirectoryContents"/>。</param>
public PhysicalStorageDirectoryContents(IDirectoryContents contents)
{
contents.NotEmpty(nameof(contents));
_entries = contents.Select <IFileInfo, IStorageFileInfo>(info =>
{
if (info is PhysicalFileInfo file)
{
return(new PhysicalStorageFileInfo(file));
}
else if (info is PhysicalDirectoryInfo dir)
{
return(new PhysicalStorageDirectoryInfo(dir));
}
// shouldn't happen unless BCL introduces new implementation of base type
throw new InvalidOperationException("Unexpected type of FileSystemInfo");
});
Exists = (contents is PhysicalDirectoryContents physical) && physical.Exists;
}