WPF：绑定的ItemsSource到目录 [英] WPF: Binding a ItemsSource to a Directory

问题描述

我试图做我的第一个WPF项目，我已经开始与此示例项目用于图像显示。部分原因是结合一个列表框到图像阵列的XAML：

I'm trying to do my first WPF project, and I've started with this sample project for image display. Part of it is the XAML that binds a Listbox to an Array of images:

<ListBox.ItemsSource>
    <x:Array Type="{x:Type ImageSource}">
        <ImageSource>http://static.flickr.com/34/70703587_b35cf6d9eb.jpg</ImageSource>
        <ImageSource>http://static.flickr.com/20/70703557_494d721b23.jpg</ImageSource>
        <ImageSource>http://static.flickr.com/35/70703504_3ebf8f0150.jpg</ImageSource>
        <ImageSource>http://static.flickr.com/35/70703474_18ef30450f.jpg</ImageSource>
    </x:Array>
</ListBox.ItemsSource>

现在是不错，但我想将其绑定到所有图像子文件夹，它是与模式匹配的子文件夹。我的目录结构是这样的：

Now that is nice, but I would like to bind it to all Images in a Subfolder and it's subfolders that match a pattern. My Directory structure is this:

Archive
    1994-01
        Index.jpg
        Page1.jpg
        ...
        PageN.jpg
    1994-02
        Index.jpg
        Page1.jpg
        ...
        PageN.jpg

我要列表框绑定到不同的Index.jpg图像。

I want to bind the Listbox to the various Index.jpg images.

我的正常的做法是做使用System.IO和Directory.GetFiles一些codeBehind，但作为XAML看起来相当强大的，我只是想知道？可这类型的结合来在XAML完全实现

My normal approach would be to do some CodeBehind using System.IO and Directory.GetFiles, but as XAML seems rather powerful, I'm just wondering: Can this type of binding be achieved entirely in the XAML?

至于说，在WPF总初学者，我想这样做的正确的方式，这似乎是数据绑定。

As said, total beginner in WPF and I want to do it the "proper" way, which seems to be DataBinding.

推荐答案

从WPF角度来看，正确的方式会是这样（分离code和presentation）：

The "proper" way from the WPF standpoint would be this (separating code and presentation):

    public class IndexReader: INotifyPropertyChanged
    {
        public IEnumerable<string> IndexFiles 
            { get { ... } set { ... raise notify } }

        public void ReadIndexImagesFromFolder(string folder)
        {
...
        }
    }

您仍然会使用绑定来绑定到列表框（之后的IndexReader的实例集设置列表框的DataContext的或它的某个父）：

you would still use binding to bind to the ListBox (after you set an set instance of IndexReader to DataContext of ListBox or one of its parents):

<ListBox ItemsSource="{Binding IndexFiles}"/>

的规则是：如果它不容易被约束，不会尝试这样做。

The rule is: if it cannot be bound easily, do not attempt it.

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