WPF 有本机文件对话框吗？

Question

在System.Windows.Controls下，我可以看到一个PrintDialog但是，我似乎找不到本机FileDialog。我是否需要创建对 System.Windows.Forms 的引用还是有其他方法？

Answer 1

WPF 确实有内置（尽管不是本机）文件对话框。具体来说，它们位于稍微出乎意料的 Microsoft.Win32 命名空间中（尽管仍然是 WPF 的一部分）。请参阅 OpenFileDialog 和特别是 SaveFileDialog 类。

但请注意，正如父命名空间所建议的那样，这些类只是 Win32 功能的包装器。然而，它确实意味着您不需要执行任何 WinForms 或 Win32 互操作，这使得它更好用。不幸的是，这些对话框的默认样式是“旧”Windows 主题，您需要在 app.manifest 中进行一些小修改才能强制它使用新主题。

Answer 2

您可以创建一个简单的附加属性来将此功能添加到文本框。 打开文件对话框可以这样使用：

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="Auto"/>
    </Grid.ColumnDefinitions>
    <TextBox i:OpenFileDialogEx.Filter="Excel documents (.xls)|*.xls" Grid.Column="0" />
    <Button Grid.Column="1">Browse</Button>
</Grid>

OpenFileDialogEx的代码：

public class OpenFileDialogEx
{
    public static readonly DependencyProperty FilterProperty =
      DependencyProperty.RegisterAttached("Filter",
        typeof (string),
        typeof (OpenFileDialogEx),
        new PropertyMetadata("All documents (.*)|*.*", (d, e) => AttachFileDialog((TextBox) d, e)));

    public static string GetFilter(UIElement element)
    {
      return (string)element.GetValue(FilterProperty);
    }

    public static void SetFilter(UIElement element, string value)
    {
      element.SetValue(FilterProperty, value);
    }

    private static void AttachFileDialog(TextBox textBox, DependencyPropertyChangedEventArgs args)
    {                  
      var parent = (Panel) textBox.Parent;

      parent.Loaded += delegate {

        var button = (Button) parent.Children.Cast<object>().FirstOrDefault(x => x is Button);

        var filter = (string) args.NewValue;

        button.Click += (s, e) => {
          var dlg = new OpenFileDialog();
          dlg.Filter = filter;

          var result = dlg.ShowDialog();

          if (result == true)
          {
            textBox.Text = dlg.FileName;
          }

        };
      };
    }
}

Answer 3

我使用了 Gregor S. 提出的解决方案，它运行良好，尽管我必须将其转换为 VB.NET 解决方案，如果它对任何人有帮助，这里是我的转换...

Imports System
Imports Microsoft.Win32

Public Class OpenFileDialogEx
    Public Shared ReadOnly FilterProperty As DependencyProperty = DependencyProperty.RegisterAttached("Filter", GetType(String), GetType(OpenFileDialogEx), New PropertyMetadata("All documents (.*)|*.*", Sub(d, e) AttachFileDialog(DirectCast(d, TextBox), e)))
    Public Shared Function GetFilter(element As UIElement) As String
        Return DirectCast(element.GetValue(FilterProperty), String)
    End Function

    Public Shared Sub SetFilter(element As UIElement, value As String)
        element.SetValue(FilterProperty, value)
    End Sub


    Private Shared Sub AttachFileDialog(textBox As TextBox, args As DependencyPropertyChangedEventArgs)
        Dim parent = DirectCast(textBox.Parent, Panel)
        AddHandler parent.Loaded, Sub()

          Dim button = DirectCast(parent.Children.Cast(Of Object)().FirstOrDefault(Function(x) TypeOf x Is Button), Button)
          Dim filter = DirectCast(args.NewValue, String)
            AddHandler button.Click, Sub(s, e)
               Dim dlg = New OpenFileDialog()
               dlg.Filter = filter
               Dim result = dlg.ShowDialog()
               If result = True Then
                   textBox.Text = dlg.FileName
               End If
            End Sub
        End Sub
    End Sub
End Class

Answer 4

感谢 Gregor S 提供了一个巧妙的解决方案。

然而，在 Visual Studio 2010 中，它似乎使设计器崩溃 - 因此我调整了 OpenFileDialogEx 类中的代码。 XAML 代码保持不变：

public class OpenFileDialogEx
{
    public static readonly DependencyProperty FilterProperty =
        DependencyProperty.RegisterAttached(
            "Filter",
            typeof(string),
            typeof(OpenFileDialogEx),
            new PropertyMetadata("All documents (.*)|*.*", (d, e) => AttachFileDialog((TextBox)d, e))
        );


    public static string GetFilter(UIElement element)
    {
        return (string)element.GetValue(FilterProperty);
    }

    public static void SetFilter(UIElement element, string value)
    {
        element.SetValue(FilterProperty, value);
    }

    private static void AttachFileDialog(TextBox textBox, DependencyPropertyChangedEventArgs args)
    {
        var textBoxParent = textBox.Parent as Panel;
        if (textBoxParent == null)
        {
            Debug.Print("Failed to attach File Dialog Launching Button Click Handler to Textbox parent panel!");
            return;
        }


        textBoxParent.Loaded += delegate
        {
            var button = textBoxParent.Children.Cast<object>().FirstOrDefault(x => x is Button) as Button;
            if (button == null)
                return;

            var filter = (string)args.NewValue;

            button.Click += (s, e) =>
            {
                var dlg = new OpenFileDialog { Filter = filter };

                var result = dlg.ShowDialog();

                if (result == true)
                {
                    textBox.Text = dlg.FileName;
                }
            };
        };
    }
}