WPF如何将自参照数据集绑定到树视图 [英] WPF how to bind self-referential dataset to a treeview
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问题描述
DataSet
绑定到一个 TreeView
。数据集是: internal static DataSet getData()
{
DataTable dt = new DataTable数据);
dt.Columns.Add(Id,typeof(int));
dt.Columns.Add(ParentId,typeof(int));
dt.Columns.Add(NodeDescription);
dt.Rows.Add(1,null,Employees);
dt.Rows.Add(2,null,Cars);
dt.Rows.Add(3,1,Men);
dt.Rows.Add(4,1,Women);
dt.Rows.Add(5,2,宝马);
dt.Rows.Add(6,2,雷克萨斯);
dt.Rows.Add(7,3,Adam Kowalski);
dt.Rows.Add(8,3,Dawid Nowacki);
dt.Rows.Add(9,4,Ilona Wacek);
DataSet ds = new DataSet();
ds.Tables.Add(dt);
//添加关系
ds.Relations.Add(rsParentChild
,ds.Tables [data]。列[Id]
,ds.Tables [data]。列[ParentId]);
return ds;
}
我想拥有:
现在我通过检索所有datatable和ading节点到树视图来实现这一点。但是,我希望有一个直接的 XAML
绑定。
我想补充说,数据集将动态变化,可能有很多嵌套级别。谢谢。
解决方案
这是一个简单的解决方案:
strong>代码隐藏
public partial class Window1:Window
{
public Window1 ()
{
InitializeComponent();
var dataSet = getData();
_rootNodes = dataSet.Tables [data]。DefaultView;
_rootNodes.RowFilter =ParentId IS NULL;
this.DataContext = this;
}
私有DataView _rootNodes;
public DataView RootNodes
{
get {return _rootNodes; }
}
内部静态DataSet getData()
{
...
}
}
XAML
< TreeView ItemsSource ={Binding RootNodes}>
< TreeView.ItemTemplate>
< HierarchicalDataTemplate ItemsSource ={Binding rsParentChild}>
< TextBlock Text ={Binding NodeDescription}/>
< / HierarchicalDataTemplate>
< /TreeView.ItemTemplate>
< / TreeView>
I am a total beginner in WPF. I would like to bind the following DataSet
containing nodes and relations to a TreeView
. The dataset is:
internal static DataSet getData()
{
DataTable dt = new DataTable("data");
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("ParentId", typeof(int));
dt.Columns.Add("NodeDescription");
dt.Rows.Add(1, null, "Employees");
dt.Rows.Add(2, null, "Cars");
dt.Rows.Add(3, 1, "Men");
dt.Rows.Add(4, 1, "Women");
dt.Rows.Add(5, 2, "BMW");
dt.Rows.Add(6, 2, "Lexus");
dt.Rows.Add(7, 3, "Adam Kowalski");
dt.Rows.Add(8, 3, "Dawid Nowacki");
dt.Rows.Add(9, 4, "Ilona Wacek");
DataSet ds = new DataSet();
ds.Tables.Add(dt);
//add a relationship
ds.Relations.Add("rsParentChild"
,ds.Tables["data"].Columns["Id"]
,ds.Tables["data"].Columns["ParentId"]);
return ds;
}
I would like to have:
Now I achieve this by resursive retrieveing all datatable and ading nodes to the treeview. However, I hope there is a direct XAML
binding.
I'd like to add that the dataset will be dynamically changing and there might many nesting levels. Thanks.
解决方案
Here's a simple solution that works :
Code-behind
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
var dataSet = getData();
_rootNodes = dataSet.Tables["data"].DefaultView;
_rootNodes.RowFilter = "ParentId IS NULL";
this.DataContext = this;
}
private DataView _rootNodes;
public DataView RootNodes
{
get { return _rootNodes; }
}
internal static DataSet getData()
{
...
}
}
XAML
<TreeView ItemsSource="{Binding RootNodes}">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding rsParentChild}">
<TextBlock Text="{Binding NodeDescription}" />
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
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