asp.net 树形结构赋值

来源：互联网发布：js 页面加载动画编辑：程序博客网时间：2024/06/05 11:22

protected void Page_Load(object sender, EventArgs e)
 {
 DataTable dt = new DataTable();
 this.Evaluate(dt);
 Response.Write("原值输出 ");
 Response.Write("ID    ParentID    Name ");
 Write(dt);
 Response.Write("树形输出 ");
 Response.Write("ID    ParentID    Name ");
 SetTree(dt, 1);
 }
 private void Evaluate(DataTable dt)
 {
 dt.Columns.Add("ID");
 dt.Columns.Add("ParentID");
 dt.Columns.Add("Name");
 dt.Rows.Add(new object[] { 1, 0 , "商品"});
 dt.Rows.Add(new object[] { 2, 1, "食品" });
 dt.Rows.Add(new object[] { 3, 1, "电器" });
 dt.Rows.Add(new object[] { 4, 2, "蔬菜" });
 dt.Rows.Add(new object[] { 5, 2, "肉类" });
 dt.Rows.Add(new object[] { 11, 3, "彩电" });
 dt.Rows.Add(new object[] { 12, 3, "冰箱" });
 dt.Rows.Add(new object[] { 13, 3, "洗衣机" });
 dt.Rows.Add(new object[] { 6, 4, "白菜" });
 dt.Rows.Add(new object[] { 7, 4, "萝卜" });
 dt.Rows.Add(new object[] { 8, 5, "牛肉" });
 dt.Rows.Add(new object[] { 9, 5, "羊肉" });
 dt.Rows.Add(new object[] { 10, 5, "猪肉" });
 //首先按ParentID升序排列
 }
 private void Write(DataTable dt)
 {
 for (int i = 0; i < dt.Rows.Count; i++)
 {
 Response.Write(dt.Rows[i][0].ToString() + "    " + dt.Rows[i][1].ToString()
 + "    " + dt.Rows[i][2].ToString() + " ");
 }
 }
 private void WriteLine(DataTable dt,int i)
 {
 Response.Write(dt.Rows[i][0].ToString() + "    " + dt.Rows[i][1].ToString()
 + "    " + dt.Rows[i][2].ToString() + " ");
 }
 private void SetTree(DataTable dt,int iID)
 {
 for (int i = 0; i < dt.Rows.Count; i++)
 {
 if (Convert.ToInt32(dt.Rows[i][1]) == iID)
 {
 SetTree(dt, Convert.ToInt32(dt.Rows[i][0]));
 WriteLine(dt, i);
 }

 }
 return;
 }

效果如下，倒着输出了，稍做修改就正了。
输出效果