選取器: 文件選取窗口, 文件夾選取窗口, 文件保存窗口
介紹
重新想象 Windows 8 Store Apps 之 選取器
FileOpenPicker - 選擇一個文件或多個文件
FolderPicker - 選擇一個文件夾
FileSavePicker - 保存文件到指定路徑
示例
1、演示如何通過 FileOpenPicker 選擇一個文件或多 個文件
Picker/FileOpenPickerDemo.xaml
<Page
x:Class="XamlDemo.Picker.FileOpenPickerDemo"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XamlDemo.Picker"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Margin="120 0 0 0">
<TextBlock Name="lblMsg" FontSize="14.667" />
<Button Name="btnPickFile" Content="pick a file" Click="btnPickFile_Click_1" Margin="0 10 0 0" />
<Button Name="btnPickFiles" Content="pick multiple files" Click="btnPickFiles_Click_1" Margin="0 10 0 0" />
</StackPanel>
</Grid>
</Page>
Picker/FileOpenPickerDemo.xaml.cs
/*
* 演示如何通過 FileOpenPicker 選擇一個文件或多個文件
*
* FileOpenPicker - 文件選擇窗口
* ViewMode - 文件選擇窗口的視圖模式，Windows.Storage.Pickers.PickerViewMode 枚舉（List 或 Thumbnail）
* SuggestedStartLocation - 文件選擇窗口所顯示的初始路徑，Windows.Storage.Pickers.PickerLocationId 枚舉
* DocumentsLibrary, ComputerFolder, Desktop,, Downloads, HomeGroup, MusicLibrary, PicturesLibrary，VideosLibrary
* FileTypeFilter - 允許顯示在文件選擇窗口的文件類型集合
* CommitButtonText - 文件選擇窗口的提交按鈕的顯示文本，此按鈕默認顯示的文本為“打開”
* PickSingleFileAsync() - 彈出文件選擇窗口，以讓用戶選擇一個文件
* PickMultipleFilesAsync() - 彈出文件選擇窗口，以讓用戶選擇多個文件
*/
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())
{
// 選擇一個文件
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.CommitButtonText = "選中此文件";
openPicker.ViewMode = PickerViewMode.Thumbnail;
openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
openPicker.FileTypeFilter.Add(".jpg");
openPicker.FileTypeFilter.Add(".gif");
openPicker.FileTypeFilter.Add(".png");
// 彈出文件選擇窗口
StorageFile file = await openPicker.PickSingleFileAsync(); // 用戶在“文件選擇窗口”中完成操作後，會返回對應的 StorageFile 對象
if (file != null)
{
lblMsg.Text = "選中文件: " + file.Name;
}
else
{
lblMsg.Text = "取消了";
}
}
}
private async void btnPickFiles_Click_1(object sender, RoutedEventArgs e)
{
if (XamlDemo.Common.Helper.EnsureUnsnapped())
{
// 選擇多個文件
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.ViewMode = PickerViewMode.List;
openPicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
openPicker.FileTypeFilter.Add("*");
// 彈出文件選擇窗口
IReadOnlyList<StorageFile> files = await openPicker.PickMultipleFilesAsync(); // 用戶在“文件選擇窗口”中完成操作後，會返回對應的 StorageFile 對象
if (files.Count > 0)
{
lblMsg.Text = "選中文件: ";
lblMsg.Text += Environment.NewLine;
foreach (StorageFile file in files)
{
lblMsg.Text += (file.Name);
lblMsg.Text += Environment.NewLine;
}
}
else
{
lblMsg.Text = "取消了";
}
}
}
}
}
2、演示如何通過 FolderPicker 選擇一個文件夾
Picker/FolderPickerDemo.xaml
<Page
x:Class="XamlDemo.Picker.FolderPickerDemo"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XamlDemo.Picker"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Margin="120 0 0 0">
<TextBlock Name="lblMsg" FontSize="14.667" />
<Button Name="btnPickFolder" Content="pick a folder" Click="btnPickFolder_Click_1" Margin="0 10 0 0 " />
</StackPanel>
</Grid>
</Page>
Picker/FolderPickerDemo.xaml.cs
/*
* 演示如何通過 FolderPicker 選擇一個文件夾
*
* FolderPicker - 文件夾選擇窗口
* ViewMode - 文件夾選擇窗口的視圖模式，Windows.Storage.Pickers.PickerViewMode 枚舉（List 或 Thumbnail）
* SuggestedStartLocation - 文件夾選擇窗口所顯示的初始路徑，Windows.Storage.Pickers.PickerLocationId 枚舉
* DocumentsLibrary, ComputerFolder, Desktop,, Downloads, HomeGroup, MusicLibrary, PicturesLibrary，VideosLibrary
* FileTypeFilter - 允許顯示在文件夾選擇窗口的文件類型集合（只能顯示符合要求的文件，但是無法選中）
* CommitButtonText - 文件夾選擇窗口的提交按鈕的顯示文本，此按鈕默認顯示的文本為“選擇這個文件夾”
* PickSingleFolderAsync() - 彈出文件夾選擇窗口，以讓用戶選擇一個文件夾
*/
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())
{
// 選擇一個文件夾
FolderPicker folderPicker = new FolderPicker();
folderPicker.SuggestedStartLocation = PickerLocationId.Desktop;
folderPicker.FileTypeFilter.Add(".docx");
folderPicker.FileTypeFilter.Add(".xlsx");
folderPicker.FileTypeFilter.Add(".pptx");
// 彈出文件夾選擇窗口
StorageFolder folder = await folderPicker.PickSingleFolderAsync(); // 用戶在“文件夾選擇窗口”中完成操作後，會返回對應的 StorageFolder 對象
if (folder != null)
{
lblMsg.Text = "選中文件夾: " + folder.Name;
}
else
{
lblMsg.Text = "取消了";
}
}
}
}
}
3、演示如何通過 FileSavePicker 保存文件到指定路徑
Picker/FileSavePickerDemo.xaml
<Page
x:Class="XamlDemo.Picker.FileSavePickerDemo"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XamlDemo.Pikcer"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Margin="120 0 0 0">
<TextBlock Name="lblMsg" FontSize="14.667" />
<Button Name="btnSaveFile" Content="save a file" Click="btnSaveFile_Click_1" Margin="0 10 0 0" />
</StackPanel>
</Grid>
</Page>
Picker/FileSavePickerDemo.xaml.cs
/*
* 演示如何通過 FileSavePicker 保存文件到指定路徑
*
* FileSavePicker - 文件保存窗口
* SuggestedStartLocation - 文件保存窗口所顯示的初始路徑，Windows.Storage.Pickers.PickerLocationId 枚舉
* DocumentsLibrary, ComputerFolder, Desktop,, Downloads, HomeGroup, MusicLibrary, PicturesLibrary，VideosLibrary
* SuggestedFileName - 需要保存的文件的默認文件名
* SuggestedSaveFile - 需要保存的文件的默認 StorageFile 對象
* FileTypeChoices - 可保存的擴展名集合
* DefaultFileExtension - 默認擴展名
* CommitButtonText - 文件保存窗口的提交按鈕的顯示文本，此按鈕默認顯示的文本為“保存”
* PickSaveFileAsync() - 彈出文件保存窗口，以讓用戶保存文件
*/
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;
// 在擴展名選擇框中將會顯示：文本(.txt)
savePicker.FileTypeChoices.Add("文本", new List<string>() { ".txt" });
savePicker.SuggestedFileName = "webabcdFileSavePicker";
// 彈出文件保存窗口
StorageFile file = await savePicker.PickSaveFileAsync(); // 用戶在“文件保存窗口”中完成操作後，會返回對應的 StorageFile 對象
if (file != null)
{
/*
* 運行到此，只是在目標地址創建了一個沒有任何內容的空白文件而已，接下來開始向文件寫入內容
*/
// 告訴 Windows ，從此時開始要防止其它程序更新指定的文件
CachedFileManager.DeferUpdates(file);
// 將指定的內容保存到指定的文件
string textContent = "I am webabcd";
await FileIO.WriteTextAsync(file, textContent);
// 告訴 Windows ，從此時開始允許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
[源碼下載]：http://files.cnblogs.com/webabcd/Windows8.rar
