public static async Task <StorageEntryLoadInfo> LoadMoreStorageItemAsync(StorageFolder destFolder, ObservableCollection <StorageEntry> collection, StorageEntryUsage usage, StorageEntryLoadInfo info)
{
IReadOnlyList <IStorageItem> storageItems = null;
if (info.LeavingCount < PreferenceAgency.Default.MaxLoadCount)
{
storageItems = await destFolder.GetItemsAsync(info.loadedCount, info.LeavingCount);
info.loadedCount = info.entriesCount;
info.isLoadedAll = true;
}
else
{
storageItems = await destFolder.GetItemsAsync(info.loadedCount, PreferenceAgency.Default.MaxLoadCount);
info.loadedCount += PreferenceAgency.Default.MaxLoadCount;
}
foreach (var eachItem in storageItems)
{
var newEntry = new StorageEntry(eachItem, usage);
collection.Add(newEntry);
}
return(info);
}
public static async Task <StorageEntryLoadInfo> LoadStorageFolderAsync(StorageFolder destFolder, ObservableCollection <StorageEntry> collection, StorageEntryUsage usage)
{
var itemsCount = Directory.GetFileSystemEntries(destFolder.Path, "*", SearchOption.TopDirectoryOnly).Length;
StorageEntryLoadInfo info;
info.entriesCount = (uint)itemsCount;
info.path = destFolder.Path;
IReadOnlyList <IStorageItem> storageItems = null;
if (itemsCount > PreferenceAgency.Default.InitialMaxLoadCount)
{
storageItems = await destFolder.GetItemsAsync(0, PreferenceAgency.Default.InitialMaxLoadCount);
info.isLoadedAll = false;
info.loadedCount = PreferenceAgency.Default.InitialMaxLoadCount;
}
else
{
storageItems = await destFolder.GetItemsAsync();
info.isLoadedAll = true;
info.loadedCount = info.entriesCount;
}
foreach (var eachItem in storageItems)
{
var newEntry = new StorageEntry(eachItem, usage);
collection.Add(newEntry);
}
return(info);
}
/// <summary> 重命名某个文件或文件夹 并将它从目前显示的list中删去 </summary>
/// <param name="enrty">需要重命名的文件或文件夹</param>
public async Task <bool> RenameEntryAsync(StorageEntry entry, string newName, NameCollisionOption option)
{
try {
await entry.RawEntry.RenameAsync(newName, option);
} catch {
return(false);
}
return(true);
}
/// <summary> 常见一个新的文件或文件夹 </summary>
/// <param name="destFolder">目标文件夹</param>
/// <param name="name">文件项名</param>
/// <param name="type">文件项的类型(文件或文件夹)</param>
/// <returns>创建成功返回true,否则返回false</returns>
public async Task <IStorageItem> CreatedNewEntry(StorageEntry destFolder, string name, StorageEntryType type, CreationCollisionOption option)
{
switch (type)
{
case StorageEntryType.File: return(await destFolder.Folder.CreateFileAsync(name, option));
case StorageEntryType.Folder: return(await destFolder.Folder.CreateFolderAsync(name, option));
default: return(null);
}
}
public static async Task <bool> EntryExistAsync(StorageEntry entry)
{
// FIXME: 对部分确实存在的文件返回不存在 "G:\STEINS;GATE 线形拘束のフェノグラム.rar"
switch (entry.EntryType)
{
case StorageEntryType.File:
return(await Task.Run(() => System.IO.File.Exists(entry.RawEntry.Path)));
case StorageEntryType.Folder:
return(await Task.Run(() => System.IO.Directory.Exists(entry.RawEntry.Path)));
default: return(false);
}
}
/// <summary> 删除文件或文件夹,删除的文件送往回收站 </summary>
/// <param name="entry">需要删除的文件项</param>
public async void DeleteEntryAsync(StorageEntry entry)
{
await entry.RawEntry.DeleteAsync(StorageDeleteOption.Default); // Default 表示删除的文件送往回收站
}
