如何在C＃中的代码中动态创建数据模板并绑定树视图层次结构数据 [英] How to dynamically create data template and bind treeview hierarchical data in code behind C#

问题描述

我有一个场景，其中树视图动态更改其数据模板和数据绑定定义。
我是这样在XAML中创建树形视图的：

I have a scenario, where a treeview changes its data template and data binding definition dynamically. I created a treeview in XAML like this:

<TreeView x:Name="BimTreeView">

</TreeView>

我没有在XAML中定义数据模板和绑定定义。因为必须根据用户的喜好更改数据模板和绑定定义。

I didn't defined the data template and binding definition in XAML. Because the data template and binding definition must have to be changed by user's preference.

我尝试了以下找到的C＃代码，此处中进行动态创建数据模板定义。但是，看下面的代码，我不知道如何通过C＃代码更改数据绑定定义。

I tried the following C# code that I found here to create the data template definition dynamically. However, looking at the following code, I couldn't figure out how to change data binding definition via C# code.

private DataTemplate GetHeaderTemplate()
{
    //create the data template
    DataTemplate dataTemplate = new DataTemplate();

    //create stack pane;
    FrameworkElementFactory stackPanel = new FrameworkElementFactory(typeof(StackPanel));
    stackPanel.Name = "parentStackpanel";
    stackPanel.SetValue(StackPanel.OrientationProperty, Orientation.Horizontal);

    // Create check box
    FrameworkElementFactory checkBox = new FrameworkElementFactory(typeof(CheckBox));
    checkBox.Name = "chk";
    checkBox.SetValue(CheckBox.NameProperty, "chk");
    checkBox.SetValue(CheckBox.TagProperty, new Binding());
    checkBox.SetValue(CheckBox.MarginProperty, new Thickness(2));
    checkBox.SetValue(CheckBox.TagProperty, new Binding() { Path = new PropertyPath("Name") });
    stackPanel.AppendChild(checkBox);

    // Create Image 
    FrameworkElementFactory image = new FrameworkElementFactory(typeof(Image));
    image.SetValue(Image.MarginProperty, new Thickness(2));
    image.SetBinding(Image.SourceProperty, new Binding() { Path = new PropertyPath("ImageUrl") });
    stackPanel.AppendChild(image);

    // create text
    FrameworkElementFactory label = new FrameworkElementFactory(typeof(TextBlock));
    label.SetBinding(TextBlock.TextProperty, new Binding() { Path = new PropertyPath("Name") });
    label.SetValue(TextBlock.ToolTipProperty, new Binding());

    stackPanel.AppendChild(label);


    //set the visual tree of the data template
    dataTemplate.VisualTree = stackPanel;

    return dataTemplate;

}

如果有人能解释我如何改变，我将非常感激数据模板，并在C＃之后的代码中绑定树视图层次结构数据。

I would really appreciate if someone could explain how can I change the data template and bind treeview hierarchical data in code behind C#.

谢谢！

推荐答案

这是上述解决方法码。以下代码现在可以动态绑定并可以为wpf中的树视图动态创建数据模板。

Here's the remedy to the above code. The following code can now dynamically bind and can dynamically create datatemplate for the treeview in wpf.

public static void FillTree()
{
    BIMExplorerUserControl.Instance.BimTreeView.ItemTemplate = GetTemplate();

    BIMExplorerUserControl.Instance.BimTreeView.ItemsSource = ViewModel.Instance.DefaultExplorerView;
}

public static HierarchicalDataTemplate GetTemplate()
{
    //create the data template
    HierarchicalDataTemplate dataTemplate = new HierarchicalDataTemplate();

    //create stack pane;
    FrameworkElementFactory stackPanel = new FrameworkElementFactory(typeof(StackPanel));
    stackPanel.Name = "parentStackpanel";
    stackPanel.SetValue(StackPanel.OrientationProperty, Orientation.Horizontal);

    ////// Create check box
    FrameworkElementFactory checkBox = new FrameworkElementFactory(typeof(CheckBox));
    checkBox.Name = "chk";
    checkBox.SetValue(CheckBox.NameProperty, "chk");
    checkBox.SetValue(CheckBox.TagProperty, new Binding());
    checkBox.SetValue(CheckBox.MarginProperty, new Thickness(2));
    checkBox.SetValue(CheckBox.TagProperty, new Binding() { Path = new PropertyPath("Name") });
    stackPanel.AppendChild(checkBox);


    // create text
    FrameworkElementFactory label = new FrameworkElementFactory(typeof(TextBlock));
    label.SetBinding(TextBlock.TextProperty, new Binding() { Path = new PropertyPath("Name") });
    label.SetValue(TextBlock.MarginProperty, new Thickness(2));
    label.SetValue(TextBlock.FontWeightProperty, FontWeights.Bold);
    label.SetValue(TextBlock.ToolTipProperty, new Binding());

    stackPanel.AppendChild(label);


    dataTemplate.ItemsSource = new Binding("Elements");

    //set the visual tree of the data template
    dataTemplate.VisualTree = stackPanel;

    return dataTemplate;

}

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