Csharp 无法使用WinUI 3文件 Select 器

如果你想在Page上打开文件选取器，这里有一个例子.

首先，让你的MainWindow可以从你的页面访问.要做到这一点，一种方法是将其设置为public static:

App.xaml.cs个

using Microsoft.UI.Xaml;

namespace FilePickerExample;

public partial class App : Application
{
    public App()
    {
        this.InitializeComponent();
    }

    public static Window? Window { get; private set; }

    protected override void OnLaunched(LaunchActivatedEventArgs args)
    {
        Window = new MainWindow();
        Window.Activate();
    }
}

在您的页面中:

using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using System;
using Windows.Storage;
using Windows.Storage.Pickers;
using WinRT.Interop;

namespace FilePickerExample;

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
    }

    private async void Button_Click(object sender, RoutedEventArgs e)
    {
        FileOpenPicker fileOpenPicker = new()
        {
            ViewMode = PickerViewMode.Thumbnail,
            FileTypeFilter = { ".jpg", ".jpeg", ".png", ".gif" },
        };

        nint windowHandle = WindowNative.GetWindowHandle(App.Window);
        InitializeWithWindow.Initialize(fileOpenPicker, windowHandle);

        StorageFile file = await fileOpenPicker.PickSingleFileAsync();

        if (file != null)
        {
            // Do something with the file.
        }
    }
}