作者:webabcd
介绍
背水一战 Windows 10 之 选取器
- 自定义文件打开选取器
示例
1、演示如何开发自定义文件打开选取器
App.xaml.cs
// 通过文件打开选取器激活应用程序时所调用的方法 protected override void OnFileOpenPickerActivated(FileOpenPickerActivatedEventArgs args) { var rootFrame = new Frame(); rootFrame.Navigate(typeof(Windows10.Picker.MyOpenPicker), args); Window.Current.Content = rootFrame; Window.Current.Activate(); }
Picker/MyOpenPicker.xaml
<Page x:Class="Windows10.Picker.MyOpenPicker" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Windows10.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="10 0 10 10"> <TextBlock Name="lblMsg" Margin="5" /> <Button Name="btnPickLocalFile" Content="选择一个本地文件" Click="btnPickLocalFile_Click" Margin="5" /> <Button Name="btnPickRemoteFile" Content="选择一个远程文件" Click="btnPickRemoteFile_Click" Margin="5" /> </StackPanel> </Grid> </Page>
Picker/MyOpenPicker.xaml.cs
/* * 演示如何开发自定义文件打开选取器 * * 1、在 Package.appxmanifest 中新增一个“文件打开选取器”声明,并做相关配置 * 2、在 App.xaml.cs 中 override void OnFileOpenPickerActivated(FileOpenPickerActivatedEventArgs args),如果 app 是由文件打开选取器激活的,则会调用此方法 * * FileOpenPickerActivatedEventArgs - 通过“文件打开选取器”激活应用程序时的事件参数 * FileOpenPickerUI - 获取 FileOpenPickerUI 对象 * Kind - 此 app 被激活的类型(ActivationKind 枚举) * 比如,如果是通过“文件打开选取器”激活的话,则此值为 FileOpenPicker * PreviousExecutionState - 此 app 被激活前的状态(ApplicationExecutionState 枚举) * 比如,如果此 app 被激活前就是运行状态的或,则此值为 Running * SplashScreen - 获取此 app 的 SplashScreen 对象 * CallerPackageFamilyName - 获取激活了此 app 的应用的包名(但是实际测试发现,获取到的却是此 app 的包名) * User - 获取激活了此 app 的 User 对象 * * FileOpenPickerUI - 自定义文件打开选取器的帮助类 * AllowedFileTypes - 允许的文件类型,只读 * SelectionMode - 选择模式(FileSelectionMode.Single 或 FileSelectionMode.Multiple) * Title - 将在“自定义文件打开选取器”上显示的标题 * CanAddFile(IStorageFile file) - 是否可以将指定的文件添加进选中文件列表 * AddFile(string id, IStorageFile file) - 将文件添加进选中文件列表,并指定 id * ContainsFile(string id) - 选中文件列表中是否包含指定的 id * RemoveFile(string id) - 根据 id 从选中文件列表中删除对应的文件 * Closing - 用户关闭“自定义文件打开选取器”时触发的事件 * * * 注意:测试时发现如果此 app 作为文件打开选取器激活之前是运行状态的话,则在作为文件打开选取器时会出现控件事件无法触发的情况(但是有的时候是正常的),不知道为什么,这一点开发和测试时要注意 */ using System; using System.Collections.Generic; using Windows.ApplicationModel; using Windows.ApplicationModel.Activation; using Windows.Storage; using Windows.Storage.Pickers.Provider; using Windows.Storage.Streams; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Navigation; namespace Windows10.Picker { public sealed partial class MyOpenPicker : Page { private FileOpenPickerUI _fileOpenPickerUI; public MyOpenPicker() { this.InitializeComponent(); } protected override void OnNavigatedTo(NavigationEventArgs e) { // 获取 FileOpenPickerUI 对象(从 App.xaml.cs 传来的) FileOpenPickerActivatedEventArgs args = (FileOpenPickerActivatedEventArgs)e.Parameter; _fileOpenPickerUI = args.FileOpenPickerUI; _fileOpenPickerUI.Title = "自定义文件打开选取器"; // 注意:选择的文件的扩展名必须匹配 AllowedFileTypes 中的定义(其是在调用端的 FileOpenPicker.FileTypeFilter 中配置的) IReadOnlyList<string> allowedFileTypes = _fileOpenPickerUI.AllowedFileTypes; lblMsg.Text = "allowedFileTypes: " + string.Join(",", allowedFileTypes); lblMsg.Text += Environment.NewLine; lblMsg.Text += "Kind: " + args.Kind; lblMsg.Text += Environment.NewLine; lblMsg.Text += "SplashScreen.ImageLocation: " + args.SplashScreen.ImageLocation; lblMsg.Text += Environment.NewLine; lblMsg.Text += "PreviousExecutionState: " + args.PreviousExecutionState; lblMsg.Text += Environment.NewLine; lblMsg.Text += "CallerPackageFamilyName: " + args.CallerPackageFamilyName; lblMsg.Text += Environment.NewLine; lblMsg.Text += "User.NonRoamableId: " + args.User.NonRoamableId; lblMsg.Text += Environment.NewLine; // _fileOpenPickerUI.Closing += _fileOpenPickerUI_Closing; base.OnNavigatedTo(e); } protected override void OnNavigatedFrom(NavigationEventArgs e) { // _fileOpenPickerUI.Closing -= _fileOpenPickerUI_Closing; base.OnNavigatedFrom(e); } // 选择一个本地文件 private async void btnPickLocalFile_Click(object sender, RoutedEventArgs e) { StorageFile file = await Package.Current.InstalledLocation.GetFileAsync(@"Assets\hololens.jpg"); if (_fileOpenPickerUI.CanAddFile(file)) { AddFileResult result = _fileOpenPickerUI.AddFile("myFile", file); lblMsg.Text = "选择的文件: " + file.Name; lblMsg.Text += Environment.NewLine; lblMsg.Text += "AddFileResult: " + result.ToString(); } } // 选择一个远程文件 private async void btnPickRemoteFile_Click(object sender, RoutedEventArgs e) { Uri uri = new Uri("http://images.cnblogs.com/mvpteam.gif", UriKind.Absolute); // 扩展名必须匹配 FileOpenPicker.FileTypeFilter 中的定义 StorageFile file = await StorageFile.CreateStreamedFileFromUriAsync("mvp.gif", uri, RandomAccessStreamReference.CreateFromUri(uri)); if (_fileOpenPickerUI.CanAddFile(file)) { AddFileResult result = _fileOpenPickerUI.AddFile("myFile", file); lblMsg.Text = "选择的文件: " + file.Name; lblMsg.Text += Environment.NewLine; lblMsg.Text += "AddFileResult: " + result.ToString(); } } } }
2、演示如何调用自定义文件打开选取器
Picker/MyOpenPickerDemo.xaml
<Page x:Class="Windows10.Picker.MyOpenPickerDemo" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Windows10.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="10 0 10 10"> <TextBlock Name="lblMsg" TextWrapping="Wrap" Margin="5"> <Run> 如果需要激活自定义的文件选取窗口,请在弹出的选取器窗口的左侧的导航列表中选择相应的 app </Run> <LineBreak /> <Run> 测试时发现如果此 app 作为文件打开选取器激活之前是运行状态的话,则在作为文件打开选取器时会出现控件事件无法触发的情况(但是有的时候是正常的),不知道为什么,这一点开发和测试时要注意 </Run> </TextBlock> <Button Name="btnMyOpenPicker" Content="弹出文件选择窗口" Click="btnMyOpenPicker_Click" Margin="5" /> </StackPanel> </Grid> </Page>
Picker/MyOpenPickerDemo.xaml.cs
/* * 演示如何调用自定义文件打开选取器 * * 自定义文件打开选取器参见 MyOpenPicker.xaml */ using System; using Windows.Storage; using Windows.Storage.Pickers; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; namespace Windows10.Picker { public sealed partial class MyOpenPickerDemo : Page { public MyOpenPickerDemo() { this.InitializeComponent(); } private async void btnMyOpenPicker_Click(object sender, RoutedEventArgs e) { // 选择一个文件 FileOpenPicker openPicker = new FileOpenPicker(); openPicker.CommitButtonText = "选中此文件"; openPicker.FileTypeFilter.Add("*"); // 弹出文件选择窗口 StorageFile file = await openPicker.PickSingleFileAsync(); if (file != null) { lblMsg.Text = "选中文件: " + file.Name; } else { lblMsg.Text = "取消了"; } } } }
OK
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原文地址:https://www.cnblogs.com/webabcd/p/9185812.html
时间: 2024-10-08 05:03:39