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| 发表于：2008-04-25 09:40:481楼 得分:30 |
protected void Page_Load(object sender, EventArgs e)
{
string strNodeValue = "1,2,43,44,3,49,4,53";
if (!IsPostBack) LoadData(strNodeValue);
}
public void LoadData(String strNodeValue)
{
strNodeValue = "," + strNodeValue + ",";
TreeView1.Nodes.Clear();
DataTable DT = new DataTable();
#region 模拟一些测试数据
//注：数据从数据读取一次就够了，没必要在递归调用中多次读取-这样性能太低
DT.Columns.Add("FilesName");
DT.Columns.Add("FileID");
DT.Columns.Add("PreID");
DT.Rows.Add(new object[] {"aaaaa",1,0 });
DT.Rows.Add(new object[] { "bbbbb", 2, 0 });
DT.Rows.Add(new object[] { "ccccc", 3, 0 });
DT.Rows.Add(new object[] { "eeeee", 4, 0 });
DT.Rows.Add(new object[] { "fffff", 5, 0 });
DT.Rows.Add(new object[] { "ggggg", 6, 10 });
DT.Rows.Add(new object[] { "hhhhh", 7, 1 });
DT.Rows.Add(new object[] { "iiiii", 8, 1 });
DT.Rows.Add(new object[] { "jjjjj", 9, 3 });
DT.Rows.Add(new object[] { "kkkkk", 10, 2 });
DT.Rows.Add(new object[] { "llllll", 11, 10 });
DT.Rows.Add(new object[] { "mmmmmm", 43, 2 });
DT.Rows.Add(new object[] { "nnnnnn", 44, 2 });
DT.Rows.Add(new object[] { "oooooo", 53, 4 });
DT.AcceptChanges();
#endregion
DataRow[] rows = DT.Select("[preID]=0");
foreach (DataRow treeRowRoot in rows)
{
TreeNode rootNode = new TreeNode();
rootNode.Text = treeRowRoot["FilesName"].ToString();
rootNode.Value = treeRowRoot["FileID"].ToString();
TreeView1.Nodes.Add(rootNode);
int pid = int.Parse(treeRowRoot["FileID"].ToString());
DT.Rows.Remove(treeRowRoot);
if (strNodeValue.IndexOf("," + pid.ToString() + ",") > -1)
rootNode.Checked = true;
CreateNode(rootNode, pid, DT, strNodeValue);
}
}
public void CreateNode(TreeNode parentnode, int preID, DataTable DT, string strNodeValue)
{
DataRow[] rows = DT.Select("[preID]='"+preID.ToString()+"'");
foreach (DataRow rw in rows)
{
TreeNode childnode = new TreeNode();
childnode.Text = rw["FilesName"].ToString();
childnode.Value = rw["FileID"].ToString();
parentnode.ChildNodes.Add(childnode);
int pid = int.Parse(rw["FileID"].ToString());
DT.Rows.Remove(rw);
if (strNodeValue.IndexOf("," + pid.ToString() + ",") > -1)
{
childnode.Parent.Expand();
childnode.Checked = true;
}
CreateNode(childnode, pid, DT, strNodeValue);
}
} | | |
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