TreeView数据绑定问题WPF C＃ [英] TreeView Databinding Issue WPF C#

问题描述

我正在使用WPF，C＃，Linq到Sql - 我有一个存储过程，我试图将结果绑定到两层深度的树视图。下面是我认为可能有助于更好地理解的一些代码，我不确定是否需要发布这么多代码，但我可以删除不需要的代码。我无法搞清楚数据模板的绑定。任何建议或意见将不胜感激。



这是我正在使用的视图模型的一部分

I am using WPF, C#, Linq to Sql -- I have a stored procedure and I am trying to bind the results to a treeview two levels deep. Below is some of the code I thought might help understand better, I am not sure if I needed to post this much code, but I can remove the uneeded code. I am having trouble figuring out the bindings with the data-templates. Any suggestions or comments would be appreciated.

Here is part of the view model I am using

        public sealed class AViewModel : ViewModel
        {

          public sealed class ItemsToGet
          {
             public Guid? Id {get; set; }
             public int? TNumber { get; set;}
             public string Title { get; set; }
             public string Description { get; set; }
             public string FullName { get; set;}
          }

          //this is the parameter I am passing to the procedure
          private Guid mText = Guid.Empty;
          private ObservableCollection<ItemsToGet> mHistory = new ObservableCollection<ItemsToGet>();

          public ObservableCollection<ItemsToGet> History
          {
          get
            {
               return mHistory;
            }
          }

           public Guid SearchText
           {
                get
                {
                    return mText ;
                }
                set
                {
                    mText = value;
                    OnPropertyChanged("SearchText");
                }
           }

    //This Guid is just for testing the Procedure and binding etc.
    //mText = new Guid("579BC2EF-6681-4728-8CC5-9671C1D54A35");

             var itemlist = from s in context.GetHistory(mText)                                           
                                           select new ItemsToGet()
                                           {
                                               Id = s.Id,                                                  
                                               TNumber = s.TNumber,
                                               Title = s.Title,
                                               Description = s.Description,
                                               FullName = s.FullName
                                            };

List<ItemsToGet> Results = itemlist.ToList();
mHistory.Clear();
Results.ForEach(b => mHistory.Add(b));

这是后面的查看代码

Here is the View Code Behind

public partial class AView : UserControl
    {
        public AView()
        {
            InitializeComponent();
            AViewModel vm = this.DataContext as AViewModel;

        }
    }

Xaml - 我想要到顶级显示标题和孩子（第二级是TNumber）

Xaml -- I want to top level to display the Title, and the child(second level to be the TNumber)

<TreeView ItemsSource="{Binding History}">

    <!--  template -->
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding History}">
                <TextBlock Foreground="Red" Text="{Binding Title}" />

            <!--  template -->
            <HierarchicalDataTemplate.ItemTemplate>
                <HierarchicalDataTemplate ItemsSource="{Binding History}">
                        <TextBlock Text="{Binding TNumber}" />

                    <!--  template -->
                    <HierarchicalDataTemplate.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding}" />
                        </DataTemplate>
                    </HierarchicalDataTemplate.ItemTemplate>

                </HierarchicalDataTemplate>
            </HierarchicalDataTemplate.ItemTemplate>

        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>

</TreeView>

</UserControl>

下面是结果的快照，有比这更多的行，但这是格式。

Here is a snapshot of what the results look like, there are more rows than this, but this is the format.

//                 Id               TNumber    Title    Description    FullName
//D5C507FB-92FC-4179-BAB9-110928736428  1   Design 1    Random         John Doe
//D5C507FB-92FC-4179-BAB9-110928736428  2   Design 1    Another        John Two
//E00FE69C-BF14-4261-BEA6-2F4167BCB4F5  1   Design 2    Random Two     Jane Doe
//E00FE69C-BF14-4261-BEA6-2F4167BCB4F5  2   Design 2    Another Random Jane Two
//E00FE69C-BF14-4261-BEA6-2F4167BCB4F5  3   Design 2    Third Random   Jane Three
//D34CC0DD-F67B-48D6-B0A6-D91F5A4B27E2  1   Design 3    Another Random John Does
//06468A50-CC07-4CEC-B2EC-1817B29DC783  1   Design 4    Full Random    John Jane
//06468A50-CC07-4CEC-B2EC-1817B29DC783  2   Design 4    Full text                 Jane John

尝试显示如下所示。感谢您的任何意见或建议。

Trying to display it like below. Thanks for any comments or suggestions.

Design 1
      --Tnumber 1
      --TNumber 2
Design 2
      --TNumber 1
      --TNumber 2
      --TNumber 3
Design 3
      --TNumber 1
ETC
ETC

推荐答案

如果我已正确理解您的问题，您需要创建一个 DataTemplateSelector [ ^ ]，看看DBTool for Oracle - 第1部分 [ ^ ]有关如何使用HierarchicalDataTemplate和DataTemplateSelector的相当完整的示例。



你会在Harlinn.Oracle.DBTool \ Types文件夹中找到两个DataTemplateSelector实现。



最好的问候

Espen Harlinn

If I''ve understood your question correctly, you need to create a DataTemplateSelector[^], have a look at DBTool for Oracle - Part 1[^] for a rather complete example on how to work with HierarchicalDataTemplate and DataTemplateSelector.

You''ll find two implementations of DataTemplateSelector in the Harlinn.Oracle.DBTool\Types folder.

Best regards
Espen Harlinn

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