C# Code:

private void LoadTree()
{
   //获取数据源
   DataTable dt = DataDictCache.Cache.UserGroup;
      
   //设置字段
   tlCategory.KeyFieldName = "GroupCode";
   tlCategory.ParentFieldName = "ParentGroupCode";
   tlCategory.DataSource = dt;
   
   //递归设置图标
   DevTreeListView.SetImageIndex(tlCategory, null, 1, 0);
   
   tlCategory.ExpandAll();
}

//来源:C/S框架网(www.csframework.com) QQ:1980854898

C# Code:



/// <summary>
/// 设置TreeList显示的图标
/// </summary>
/// <param name="tl">TreeList组件</param>
/// <param name="node">当前结点，从根结构递归时此值必须=null</param>
/// <param name="nodeIndex">根结点图标(无子结点)</param>
/// <param name="parentIndex">有子结点的图标</param>
public static void SetImageIndex(TreeList tl, TreeListNode node, int nodeIndex, int parentIndex)
{
   if (node == null)
   {
      foreach (TreeListNode N in tl.Nodes)
      SetImageIndex(tl, N, nodeIndex, parentIndex);
   }
   else
   {
      if (node.HasChildren || node.ParentNode == null)
      {
         //node.SelectImageIndex = parentIndex;
         node.StateImageIndex = parentIndex;
         node.ImageIndex = parentIndex;
      }
      else
      {
         //node.SelectImageIndex = nodeIndex;
         node.StateImageIndex = nodeIndex;
         node.ImageIndex = nodeIndex;
      }
      
      foreach (TreeListNode N in node.Nodes)
      {
         SetImageIndex(tl, N, nodeIndex, parentIndex);
      }
   }
}

//来源:C/S框架网(www.csframework.com) QQ:1980854898