以编程方式将TreeViewItem绑定到自定义对象的列表

本文关键字：自定义 对象 列表 绑定 编程 方式 TreeViewItem | 更新日期: 2023-09-27 18:29:40

如何以编程方式将newTableList.Items元素的"Header"属性绑定到TableModel.TABLE_NAME？

foreach (SchemaModel schema in connection.schemas)
{ 
 TreeViewItem newSchema = new TreeViewItem() 
 { 
     Header = schema.SCHEMA_NAME.ToString() 
 };
 Binding newTableBinding = new Binding();     
 newTableBinding.Source = schema.tables;
 TreeViewItem newTableList = new TreeViewItem()
 {
      Header = "Tables",
 };
 BindingOperations.SetBinding( newTableList, TreeViewItem.ItemsSourceProperty, newTableBinding);
newSchema.Items.Add(newTableList);
newTVI.Items.Add(newSchema);
}

我以前非常慢的代码是这样的：

foreach (TableModel table in schema.tables)
{
   newTableList.Items.Add(new TreeViewItem()
   {
       Header = table.TABLE_NAME.ToString()
   });
}

旧主题（为了更好地查看）

我尝试构建自定义TreeView，并用绑定到自定义对象列表的最快速度更改我的"非常慢的方法"。

我有包含的SchemaModel

List<TableModel> tables

每个TableModel都有

string TABLE_NAME.

我以前非常慢的方法是：

/*  VERY SLOW METHOD !!! */
//foreach (TableModel table in schema.tables)
//{
//    newTableList.Items.Add(new TreeViewItem()
//    {
//        Header = table.TABLE_NAME.ToString()
//    });
//}

每次创建TreeViewItem都会减慢我的UI，我无法通过多任务处理来修复它。

我决定以编程方式绑定到这样的TableModels列表：

Binding newTableBinding = new Binding();
newTableBinding.Source = schema.tables;
TreeViewItem newTableList = new TreeViewItem()
{
    Header = "Tables",
    // ItemsSource = schema.tables // also works 
};
BindingOperations.SetBinding( newTableList, TreeViewItem.ItemsSourceProperty, newTableBinding);

如何将基于schema.tables列表的项的Header属性绑定到"TABLE_NAME"？

我的完整代码

代码：

foreach (ConnectionModel connection in aliases)
{
    TreeViewItem newTVI = new TreeViewItem() { Header = connection.alias.ToString() };
    foreach (SchemaModel schema in connection.schemas)
    {
        TreeViewItem newSchema = new TreeViewItem() { Header = schema.SCHEMA_NAME.ToString() };
        Binding newTableBinding = new Binding();
        newTableBinding.Source = schema.tables;
        // newTableBinding.Path = new PropertyPath("TABLE_NAME");
        TreeViewItem newTableList = new TreeViewItem()
        {
            Header = "Tables",
            // ItemsSource = schema.tables
        };
        BindingOperations.SetBinding( newTableList, TreeViewItem.ItemsSourceProperty, newTableBinding);
       TreeViewItem newIndexList = new TreeViewItem() { Header = "Indexes" };
      /*  VERY SLOW METHOD !!! */
       //foreach (TableModel table in schema.tables)
       //{
       //    newTableList.Items.Add(new TreeViewItem()
       //    {
       //        Header = table.TABLE_NAME.ToString()
       //    });
       //}
       newSchema.Items.Add(newTableList);
       newSchema.Items.Add(newIndexList);
       newTVI.Items.Add(newSchema);
   }
   tmpAliasTree.Items.Add(newTVI);
}

tmpAliasTree是我的TreeView。

我的连接模型

[Serializable()]
public class ConnectionModel
{
    private int    _id;
    private string _dsn;
    private string _alias   ;
    private string _host    ;
    private string _port    ;
    private string _database;
    private string _username;
    private string _password;
    public List<SchemaModel> schemas = new List<SchemaModel>();
  }

我的模式：

[Serializable()]
public class SchemaModel
{
    [System.Xml.Serialization.XmlElement("SCHEMA_NAME")]
    public string SCHEMA_NAME { get; set; } = "";
    [XmlArray("tables"), XmlArrayItem("TableModel", typeof(TableModel), ElementName = "TableModel")]
    public List<TableModel> tables = new List<TableModel>();
}

我的TableModel

[Serializable()]
public class TableModel
{
    [System.Xml.Serialization.XmlElement("TABLE_CAT")]
    public string TABLE_CAT     { get; set; }  = "";
    [System.Xml.Serialization.XmlElement("TABLE_SCHEM")]
    public string TABLE_SCHEM   { get; set; }  = "";
    [System.Xml.Serialization.XmlElement("TABLE_NAME")]
    public string TABLE_NAME    { get; set; }  = "";
    [System.Xml.Serialization.XmlElement("TABLE_TYPE")]
    public string TABLE_TYPE    { get; set; }  = "";
    [System.Xml.Serialization.XmlElement("REMARKS")]
    public string REMARKS       { get; set; } = "";
}

谢谢你的建议。

以编程方式将TreeViewItem绑定到自定义对象的列表

尽管我同意您应该考虑将视图定义移动到XAML，但您可以通过使用ItemsControl.ItemContainerStyle属性（TreeView和TreeViewItem都源自ItemsControl）来实现您的要求。基本上，您需要定义一个以TreeViewItem为目标的样式，并为TreeViewItem.HeaderProperty添加一个具有适当绑定值的setter，然后将该样式分配给您的树视图或特定项（取决于您的需要）。这里有一个例子：

TreeViewItem newTVI = new TreeViewItem() { Header = connection.alias.ToString() };
var tableModelItemStyle = new Style(typeof(TreeViewItem));
tableModelItemStyle.Setters.Add(new Setter
{
    Property = TreeViewItem.HeaderProperty,
    //since items will present instances of TableModel, the DataContext will hold
    //the model, so we can define the binding using only the property name
    Value = new Binding("TABLE_NAME"),
});
foreach(...)
{
    ...
    TreeViewItem newTableList = new TreeViewItem
    {
        ...
        ItemContainerStyle = tableModelItemStyle,
    };
    ...
}

如果你想为树视图中的所有项目设置样式（我不建议这样做），你可以这样做：

newTVI.ItemContainerStyle = tableModelItemStyle;
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