C# TreeView从数据库绑定数据的示例

//绑定TrreView
    private void InitModuleTree(DataTable dt)
    {
      //清空treeview上所有节点
      this.tree_Role.Nodes.Clear(); 
      int[] gen = new int[dt.Rows.Count]; //用于存储父节点Tag
      int[] zi = new int[dt.Rows.Count]; //用于存储子节点Tag
      for (int i = 0; i < gen.Length; i++)
      {
        string zhi=dt.Rows[i][3].ToString();//获取节点Tag值  eg：1-2
        if (zhi.Length>1)  //表示是子节点  eg：1-2
	      {
		      gen[i] = int.Parse(zhi.Substring(0, zhi.IndexOf('-')));
          zi[i] = int.Parse(zhi.Substring(zhi.IndexOf('-') + 1));
	      }
        else  //表示是根节点  eg：2
        {
          //将所有父节点加到treeview上
          zi[i] =int.Parse(zhi);
          TreeNode nodeParent = new TreeNode();
          nodeParent.Tag = (zi[i]).ToString();
          nodeParent.Text = dt.Rows[i][1].ToString();
          tree_Role.Nodes.Add(nodeParent);
        }
      }
      bindChildNote(dt,gen,zi);
    }

//绑定子节点
    private void bindChildNote(DataTable dt, int[] gen, int[] zi) 
    {
      for (int i = 0; i < gen.Length; i++)  
      {
        if (gen[i] != 0 && zi[i] != 0)    //便利所有节点，找到所有子节点
        {
          TreeNode childNode = new TreeNode();
          foreach (TreeNode item in tree_Role.Nodes)  //便历treeview上所有父节点
          {
            if (item.Tag.ToString() == gen[i].ToString()) //找到当前子节点的父节点
            {
              childNode.Tag = zi[i].ToString();
              childNode.Text = dt.Rows[i][1].ToString();
              item.Nodes.Add(childNode);
            }
          }
        }
      }
      tree_Role.ExpandAll();   //展开整棵树
    }

namespace TreeeeeeeeeeeView
{
  public partial class Treeeeeeeeeee : Form
  {
    public Treeeeeeeeeee()
    {
      InitializeComponent();
 
      //从数据库获取数据，得到结果为DataTable
      SystemManager.Dao.RolePower dao = new SystemManager.Dao.RolePower();
      DataSet ds = CommonLib.Dao.CompressUtil.DeCompress(dao.getSystemModule());
      DataTable dt = ds.Tables[0];
      InitModuleTree(dt);
    }
 
    //绑定TrreView
    private void InitModuleTree(DataTable dt)
    {
      //清空treeview上所有节点
      this.tree_Role.Nodes.Clear(); 
      int[] gen = new int[dt.Rows.Count]; //用于存储父节点Tag
      int[] zi = new int[dt.Rows.Count]; //用于存储子节点Tag
      for (int i = 0; i < gen.Length; i++)
      {
        string zhi=dt.Rows[i][3].ToString();//获取节点Tag值  eg：1-2
        if (zhi.Length>1)  //表示是子节点  eg：1-2
	      {
		      gen[i] = int.Parse(zhi.Substring(0, zhi.IndexOf('-')));
          zi[i] = int.Parse(zhi.Substring(zhi.IndexOf('-') + 1));
	      }
        else  //表示是根节点  eg：2
        {
          //将所有父节点加到treeview上
          zi[i] =int.Parse(zhi);
          TreeNode nodeParent = new TreeNode();
          nodeParent.Tag = (zi[i]).ToString();
          nodeParent.Text = dt.Rows[i][1].ToString();
          tree_Role.Nodes.Add(nodeParent);
        }
      }
      bindChildNote(dt,gen,zi);
    }
 
    //绑定子节点
    private void bindChildNote(DataTable dt, int[] gen, int[] zi) 
    {
      for (int i = 0; i < gen.Length; i++)  
      {
        if (gen[i] != 0 && zi[i] != 0)    //便利所有节点，找到所有子节点
        {
          TreeNode childNode = new TreeNode();
          foreach (TreeNode item in tree_Role.Nodes)  //便历treeview上所有父节点
          {
            if (item.Tag.ToString() == gen[i].ToString()) //找到当前子节点的父节点
            {
              childNode.Tag = zi[i].ToString();
              childNode.Text = dt.Rows[i][1].ToString();
              item.Nodes.Add(childNode);
            }
          }
        }
      }
      tree_Role.ExpandAll();   //展开整棵树
    }
    
  }
}