我可以从（ResourceDictionary）后面的代码访问命名控件吗？

Question

是否可以从 (ResourceDictionary) 后面的代码访问命名控件？

例如对我来说，有必要创建很多文件夹选择对话框。对于必须选择的每个文件夹，一个对话框可能包含几行。 每行包括：标签（名称）、文本框（选择的路径）和一个按钮（打开 FileBrowserDialog）。

所以现在我想在 FileBrowserDialog 完成后访问 TextBox。但我无法从 CodeBehind 访问“SelectedFolderTextBox”。

有没有更好的方法来实现我想做的事情？

XAML

<ResourceDictionary ...>
    ...

    <StackPanel x:Key="FolderSearchPanel"
                x:Shared="False">
        <Label Content="Foldername"/>
        <TextBox x:Name="SelectedFolderTextBox" 
                 Text="C:\Folder\Path\"/>
        <Button Content="..."
                Click="Button_Click"/>
    </StackPanel>
</ResourceDictionary>

代码隐藏

private void Button_Click(object sender, RoutedEventArgs e)
{
    // Initialize and show
    var dialog = new System.Windows.Forms.FolderBrowserDialog();
    System.Windows.Forms.DialogResult result = dialog.ShowDialog();

    // Process result
    if (result == System.Windows.Forms.DialogResult.OK)
    {
        string selectedPath = dialog.SelectedPath;

        SelectedFolderTextBox.Text = selectedPath;  // THIS DOES NOT WORK
                                                    // since I don't have access to it
                                                    // but describes best, what I want to do
    }
}

Answer 1

您应该能够将sender 参数转换为Button，然后将Button 的Parent 属性转换为StackPanel，并在@ 的Children 集合中找到控件987654327@。像这样的：

private void Button_Click(object sender, RoutedEventArgs e)
{
    // Initialize and show
    var dialog = new System.Windows.Forms.FolderBrowserDialog();
    System.Windows.Forms.DialogResult result = dialog.ShowDialog();

    // Process result
    if (result == System.Windows.Forms.DialogResult.OK)
    {
        string selectedPath = dialog.SelectedPath;

        Button clickedButton = sender as Button;
        StackPanel sp = clickedButton.Parent as StackPanel;
        if (sp != null)
        {
            TextBox SelectedFolderTextBox = sp.Children.OfType<TextBox>().FirstOrDefault(x => x.Name == "SelectedFolderTextBox");
            if (SelectedFolderTextBox != null)
                SelectedFolderTextBox.Text = selectedPath;
        }
    }
}

Answer 2

当你有一组重复的控件和一些相关的功能时，创建一个可重用的控件是有意义的：

通过项目“添加项目”对话框添加用户控件并使用此 xaml 和代码：

<UserControl x:Class="WpfDemos.FolderPicker"
             x:Name="folderPicker"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="75" d:DesignWidth="300">
    <StackPanel>
        <Label Content="{Binding Path=Title, ElementName=folderPicker}"/>
        <TextBox x:Name="SelectedFolderTextBox" 
                 Text="{Binding Path=FullPath, ElementName=folderPicker,
                                UpdateSourceTrigger=PropertyChanged}"/>
        <Button Content="..." Click="PickClick"/>
    </StackPanel>
</UserControl>

public partial class FolderPicker : UserControl
{
    public FolderPicker()
    {
        InitializeComponent();
    }

    public static readonly DependencyProperty TitleProperty = DependencyProperty.Register(
        "Title", typeof (string), typeof (FolderPicker), new PropertyMetadata("Folder"));

    public string Title
    {
        get { return (string) GetValue(TitleProperty); }
        set { SetValue(TitleProperty, value); }
    }

    public static readonly DependencyProperty FullPathProperty = DependencyProperty.Register(
        "FullPath", typeof (string), typeof (FolderPicker), new FrameworkPropertyMetadata(@"C:\", FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));

    public string FullPath
    {
        get { return (string) GetValue(FullPathProperty); }
        set { SetValue(FullPathProperty, value); }
    }

    private void PickClick(object sender, RoutedEventArgs e)
    {
        using (var dialog = new System.Windows.Forms.FolderBrowserDialog())
        {
            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                FullPath = dialog.SelectedPath;
        }
    }
}

TextBox 可以从代码隐藏中访问。依赖属性Title 和FullPath 允许为不同的用途自定义控件并创建与视图模型的绑定（这对于声明为资源的控件组是无法做到的）。示例

查看模型：

public class MyViewModel
{
    public string Src { get; set; }
    public string Target { get; set; }
}

查看：

public MyWindow()
{
    InitializeComponent();
    this.DataContext = new MyViewModel { Src = "C:", Target = "D:" }
}

<StackPanel>
    <wpfDemos:FolderPicker Title="Source"      FullPath="{Binding Path=Src}"   />
    <wpfDemos:FolderPicker Title="Destination" FullPath="{Binding Path=Target}"/>
</StackPanel>