DevExpress TreeList增量搜索

Question

我需要在treelist中实现增量搜索。判断标准是节点名称包含特定字符串。我在这里的http://community.devexpress.com/forums/t/15735.aspx中找到了“您应该覆盖XtraTreeList.Handler.TreeListHandler.IncrementalSearchState类的FindNode方法”的建议。但我不明白如何实现这一点。

Answer 1

一个简单的递归应该给出一个遍历整个树的解决方案。

private TreeListNode GetNodeByName(TreeListNodes prmNodes, String prmName)
{
   foreach (TreeListNode node in prmNodes)
   {
      // Assume the data is present in column 0.
      if (node[0].ToString().Contains(prmName, StringComparison.CurrentCultureIgnoreCase))
         return node;

      TreeListNode foundNode = GetNodeByName(node.Nodes, prmName);

      if (foundNode != null)
         return foundNode;
   }
   return null;
}
//---------------------------------------------------------------------------

现在，如果你做一个简单的调用，比如：

TreeListNode node = GetNodeByName (treeList.Nodes, "MyNodeName");

您将获得所需的节点。

Answer 2

我想大概是这样的：

public class MyTreeList : DevExpress.XtraTreeList.TreeList
{

    protected override DevExpress.XtraTreeList.Handler.TreeListHandler CreateHandler()
    {
        return new MyHandler(this);
    }

    internal DevExpress.XtraTreeList.Handler.TreeListHandler GetHandler() { return this.Handler; }
}

public class MyHandler : DevExpress.XtraTreeList.Handler.TreeListHandler
{
    public MyHandler(TreeList tree) : base(tree) { }

    protected override TreeListControlState CreateState(TreeListState state)
    {
        if (state == TreeListState.IncrementalSearch && this.TreeList is MyTreeList)
            return new MyFinder((this.TreeList as MyTreeList).GetHandler());
        return base.CreateState(state);
    }
}

public class MyFinder : DevExpress.XtraTreeList.Handler.TreeListHandler.IncrementalSearchState
{
    public MyFinder(DevExpress.XtraTreeList.Handler.TreeListHandler handler) : base(handler) { }
    protected override TreeListNode FindNode(FindNodeArgs e)
    {
        ////////////////////////////////////
        ////////////////////////////////////
        ////////////////////////////////////
        return base.FindNode(e);
    }
}