Question

我希望我的程序像这样工作： 1.它从MS SQL获取数据 2.根据此数据创建树（数据行）我有几个textBoxex，我想用基于点击节点的数据填充它们。我为SQL连接创建了类：

setNextNode(...)

和treeView创建者：

 class Baza
{
    private SqlConnection connection;
    string dbdir = "Data Source=CS24\\SQLEXPRESS;user id=sa;password=alamakota;database=SHARP;connection timeout=3";
    public Baza()
    {
      connection = new SqlConnection();
      connection.ConnectionString = dbdir;
      connection.Open();
    }
    public DataTable get_data(string q) 
    {
        DataTable dt = new DataTable(); 
        SqlDataReader dr ; 
        SqlCommand sqlc = new SqlCommand(q);
        sqlc.Connection = this.connection;
        dr = sqlc.ExecuteReader();
        dt.Load(dr);
        return dt;
    }
}

我认为该节点应该有ID，我可以使用它来填充数据，但我真的不知道该怎么做。你能帮帮我吗？

Answer 1

我遇到了同样的麻烦，我这样做了：

（我在ParentID，IsGroup，OrderInGroup列中有分层数据）

为TreeViewItems

创建一个类

 public class xTreeViewItem : INotifyPropertyChanged
 {
      public int id { get; set; }
      public string Header { get; set; }
      public int parent;
      public List<xTreeViewItem > children { get; set; }
      public bool isGroup = false;
      public bool ParentResolved = false;
      public float order {get;set;}

      public void NotifyPropertyChanged(string info)
      {
           if (PropertyChanged != null)
           {
                 PropertyChanged(this, new PropertyChangedEventArgs(info));
           }
      }
      public event PropertyChangedEventHandler PropertyChanged;
 }

现在创建一个包含SQL数据的列表

private void LoadTree()
{
    ObservableCollection<xTreeViewItem> treeSource = new ObservableCollection<xTreeViewItem>();
    List<xTreeViewItem> Buffer = new List<xTreeViewItem>();
    foreach (DataRow row in table.Rows)
    {
         xTreeViewItem itm = new TreeViewItem();
         // Load the required heirarchial data
         Buffer.Add(itm);
    }

    for (int i = Buffer.Count - 1; i >= 0; i--)
    {
        if (Buffer[i].parentID != 0)
        {
            if (Buffer[i].ParentResolved)
                Buffer.RemoveAt(i);
            else
            {
                Buffer[i].ParentResolved = true;

                while (Buffer.Any(c => (c.parentID == Buffer[i].menuID && !c.ParentResolved)))
                {
                    Buffer[i].children.Add(FindChildren(Buffer[i]));
                }
                xTreeViewItem parent = Buffer.First(c => c.menuID == Buffer[i].parentID);
                parent.children.Add(Buffer[i]);
                Buffer[i].parent = parent;

                Buffer.RemoveAt(i);
            }
        }
    }
    // remaining items acts as mainItems, so add it to the treeSource
    foreach (xTreeViewItem x in Buffer)
    {
         treeSource.Add(x);
    }
    treeView.ItemsSource = treeSource;
}

xTreeViewItem FindChildren(xMenuItem x)
{
    List<xTreeViewItem > subBuffer = Buffer.Where(c => (c.parentID == x.menuID && !c.ParentResolved)).ToList(); // if there is, get all of them to a list

    subBuffer = subBuffer.OrderBy(c => c.order).ToList();    // << THIS IS CRAZY, BUT FIXES :P // order all of them by their 'order' property
    int indx = Buffer.IndexOf(subBuffer[0]);                                                    // get the first item after ordering

    Buffer[indx].ParentResolved = true;
    Buffer[indx].parent = x;                // changing parentresolved property to prevent infinte loops

    while (Buffer.Any(c => (c.parentID == Buffer[indx].menuID && !c.ParentResolved))) // again checking if the current child got any other child.
    {
        Buffer[indx].children.Add(FindChildren(Buffer[indx])); // adding all the childs                     
    }

    return Buffer[indx]; // return the child

}

在XAML中：把它作为TreeView的ItemTemplate：）

    <TreeView.ItemTemplate>
          <HierarchicalDataTemplate ItemsSource="{Binding children}">
                  <ContentPresenter Content="{Binding Header}" Margin="2,0"/>
          </HierarchicalDataTemplate>
     </TreeView.ItemTemplate>

这对我有用：P 要获取所选项目，只需使用：

xTreeViewItem selectedItem = (xTreeViewItem)treeView.SelectedItem;

使用此'selectedItem'更新您的视图; .. :)）

希望它有所帮助：）

**有时这些项目可能会反转。只需给出List.Reverse（）;在它是这样的地方，我没有自己运行代码，无论如何这应该适用于所有类型，例如从数据库加载MenuItems和desplaying（如果你有多种语言很有用）：）

**我只有18岁：P还没有获得CS学位，这只是我提出的代码:)是的，可能存在缺陷但它对我有用：P

：）

将数据绑定到treeView c＃

1 个答案: