重新想象 Windows 8 Store Apps (25)
[源码下载]重新想象 Windows 8 Store Apps (25) - 选取器: 文件选取窗口, 文件夹选取窗口, 文件保存窗口
作者：webabcd
介绍
重新想象 Windows 8 Store Apps 之 选取器
[*]FileOpenPicker - 选择一个文件或多个文件
[*]FolderPicker - 选择一个文件夹
[*]FileSavePicker - 保存文件到指定路径
示例
1、演示如何通过 FileOpenPicker 选择一个文件或多个文件
Picker/FileOpenPickerDemo.xaml
Picker/FileOpenPickerDemo.xaml.cs
/*
* 演示如何通过 FileOpenPicker 选择一个文件或多个文件
*
* FileOpenPicker - 文件选择窗口
* ViewMode - 文件选择窗口的视图模式，Windows.Storage.Pickers.PickerViewMode 枚举（List 或 Thumbnail）
* SuggestedStartLocation - 文件选择窗口所显示的初始路径，Windows.Storage.Pickers.PickerLocationId 枚举
* DocumentsLibrary, ComputerFolder, Desktop,, Downloads, HomeGroup, MusicLibrary, PicturesLibrary，VideosLibrary
* FileTypeFilter - 允许显示在文件选择窗口的文件类型集合
* CommitButtonText - 文件选择窗口的提交按钮的显示文本，此按钮默认显示的文本为“打开”
* PickSingleFileAsync() -弹出文件选择窗口，以让用户选择一个文件
* PickMultipleFilesAsync() - 弹出文件选择窗口，以让用户选择多个文件
*/
using System;
using System.Collections.Generic;
using Windows.Storage;
using Windows.Storage.AccessCache;
using Windows.Storage.Pickers;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace XamlDemo.Picker
{
public sealed partial class FileOpenPickerDemo : Page
{
public FileOpenPickerDemo()
{
this.InitializeComponent();
}
private async void btnPickFile_Click_1(object sender, RoutedEventArgs e)
{
if (XamlDemo.Common.Helper.EnsureUnsnapped())
{
// 选择一个文件
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.CommitButtonText = "选中此文件";
openPicker.ViewMode = PickerViewMode.Thumbnail;
openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
openPicker.FileTypeFilter.Add(".jpg");
openPicker.FileTypeFilter.Add(".gif");
openPicker.FileTypeFilter.Add(".png");
// 弹出文件选择窗口
StorageFile file = await openPicker.PickSingleFileAsync(); // 用户在“文件选择窗口”中完成操作后，会返回对应的 StorageFile 对象
if (file != null)
{
lblMsg.Text = "选中文件: " + file.Name;
}
else
{
lblMsg.Text = "取消了";
}
}
}
private asyncvoid btnPickFiles_Click_1(object sender, RoutedEventArgs e)
{
if (XamlDemo.Common.Helper.EnsureUnsnapped())
{
// 选择多个文件
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.ViewMode = PickerViewMode.List;
openPicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
openPicker.FileTypeFilter.Add("*");
// 弹出文件选择窗口
IReadOnlyList files = await openPicker.PickMultipleFilesAsync(); // 用户在“文件选择窗口”中完成操作后，会返回对应的 StorageFile 对象
if (files.Count > 0)
{
lblMsg.Text = "选中文件: ";
lblMsg.Text += Environment.NewLine;
foreach (StorageFile file in files)
{
lblMsg.Text += (file.Name);
lblMsg.Text += Environment.NewLine;
}
}
else
{
lblMsg.Text = "取消了";
}
}
}
}
}
2、演示如何通过 FolderPicker 选择一个文件夹
Picker/FolderPickerDemo.xaml
Picker/FolderPickerDemo.xaml.cs
/*
* 演示如何通过 FolderPicker 选择一个文件夹
*
* FolderPicker - 文件夹选择窗口
* ViewMode - 文件夹选择窗口的视图模式，Windows.Storage.Pickers.PickerViewMode 枚举（List 或 Thumbnail）
* SuggestedStartLocation - 文件夹选择窗口所显示的初始路径，Windows.Storage.Pickers.PickerLocationId 枚举
* DocumentsLibrary, ComputerFolder, Desktop,, Downloads, HomeGroup, MusicLibrary, PicturesLibrary，VideosLibrary
* FileTypeFilter - 允许显示在文件夹选择窗口的文件类型集合（只能显示符合要求的文件，但是无法选中）
* CommitButtonText - 文件夹选择窗口的提交按钮的显示文本，此按钮默认显示的文本为“选择这个文件夹”
* PickSingleFolderAsync() - 弹出文件夹选择窗口，以让用户选择一个文件夹
*/
using System;
using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace XamlDemo.Picker
{
public sealed partial class FolderPickerDemo : Page
{
public FolderPickerDemo()
{
this.InitializeComponent();
}
private async void btnPickFolder_Click_1(object sender, RoutedEventArgs e)
{
if (XamlDemo.Common.Helper.EnsureUnsnapped())
{
// 选择一个文件夹
FolderPicker folderPicker = new FolderPicker();
folderPicker.SuggestedStartLocation = PickerLocationId.Desktop;
folderPicker.FileTypeFilter.Add(".docx");
folderPicker.FileTypeFilter.Add(".xlsx");
folderPicker.FileTypeFilter.Add(".pptx");
// 弹出文件夹选择窗口
StorageFolder folder = await folderPicker.PickSingleFolderAsync(); // 用户在“文件夹选择窗口”中完成操作后，会返回对应的 StorageFolder 对象
if (folder != null)
{
lblMsg.Text = "选中文件夹: " + folder.Name;
}
else
{
lblMsg.Text = "取消了";
}
}
}
}
}
3、演示如何通过 FileSavePicker 保存文件到指定路径
Picker/FileSavePickerDemo.xaml
Picker/FileSavePickerDemo.xaml.cs
/*
* 演示如何通过 FileSavePicker 保存文件到指定路径
*
* FileSavePicker - 文件保存窗口
* SuggestedStartLocation - 文件保存窗口所显示的初始路径，Windows.Storage.Pickers.PickerLocationId 枚举
* DocumentsLibrary, ComputerFolder, Desktop,, Downloads, HomeGroup, MusicLibrary, PicturesLibrary，VideosLibrary
* SuggestedFileName - 需要保存的文件的默认文件名
* SuggestedSaveFile - 需要保存的文件的默认 StorageFile 对象
* FileTypeChoices - 可保存的扩展名集合
* DefaultFileExtension - 默认扩展名
* CommitButtonText - 文件保存窗口的提交按钮的显示文本，此按钮默认显示的文本为“保存”
* PickSaveFileAsync() - 弹出文件保存窗口，以让用户保存文件
*/
using System;
using System.Collections.Generic;
using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.Storage.Provider;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace XamlDemo.Picker
{
public sealed partial class FileSavePickerDemo : Page
{
public FileSavePickerDemo()
{
this.InitializeComponent();
}
private async void btnSaveFile_Click_1(object sender, RoutedEventArgs e)
{
if (XamlDemo.Common.Helper.EnsureUnsnapped())
{
FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
// 在扩展名选择框中将会显示：文本(.txt)
savePicker.FileTypeChoices.Add("文本", new List() { ".txt" });
savePicker.SuggestedFileName = "webabcdFileSavePicker";
// 弹出文件保存窗口
StorageFile file = await savePicker.PickSaveFileAsync(); // 用户在“文件保存窗口”中完成操作后，会返回对应的 StorageFile 对象
if (file != null)
{
/*
* 运行到此，只是在目标地址创建了一个没有任何内容的空白文件而已，接下来开始向文件写入内容
*/
// 告诉 Windows ，从此时开始要防止其它程序更新指定的文件
CachedFileManager.DeferUpdates(file);
// 将指定的内容保存到指定的文件
string textContent = "I am webabcd";
await FileIO.WriteTextAsync(file, textContent);
// 告诉 Windows ，从此时开始允许其它程序更新指定的文件
FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
if (status == FileUpdateStatus.Complete)
{
lblMsg.Text = "文件 " + file.Name + " 保存成功";
}
lblMsg.Text += Environment.NewLine;
lblMsg.Text += "FileUpdateStatus: " + status.ToString();
}
else
{
lblMsg.Text = "取消了";
}
}
}
}
}
OK
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