1、普通递归法（速度慢）
在TreeView中添加选中节点的背景样式<SelectedNodeStyle BackColor="Silver" />
<asp:TreeView ID="TreeView1" runat="server" ShowLines="True">
<SelectedNodeStyle BackColor="Silver" />
</asp:TreeView>
/// <summary>
/// 生成树
/// </summary>
private void AddTree(string ParentID, TreeNode pNode)
{
DataSet ds = org.GetDataI(); //获取所有数据
DataView dvTree = new DataView(ds.Tables[0]); //把ds放到DataView中
//过滤ParentOrgID,得到当前的所有子节点
dvTree.RowFilter = "[ParentOrgID] = '" + ParentID + "'";
dvTree.Sort = "OrderBy";
foreach (DataRowView Row in dvTree)
{
TreeNode node = new TreeNode();
if (pNode == null)
{ //添加根节点
node.Text = Row["Name"].ToString();
node.Value = Row["OrgID"].ToString();
node.ImageUrl = this.SkinFolder + @"images\Org\Dept1.gif";
node.NavigateUrl = "SerachRecordInfo.aspx?OrgID=" + node.Value + "";
node.Target = "mainFrame";
//node.NavigateUrl.NavigateUrl =Request.Url.LocalPath +"?OrgID=" + Row["OrgID"].ToString();
node.Expanded = false;
//TreeView1.Style.Add("background-color", "Silver");
TreeView1.Nodes.Add(node);
AddTree(Row["OrgID"].ToString(), node); //再次递归
}
else
{ //添加当前节点的子节点
node.Text = Row["Name"].ToString();
node.Value = Row["OrgID"].ToString();
node.ImageUrl = this.SkinFolder + @"images\Org\Dept2.gif";
node.NavigateUrl = "SerachRecordInfo.aspx?OrgID=" + node.Value + "";
node.Target = "mainFrame";
node.Expanded = false;
pNode.ChildNodes.Add(node);
AddTree(Row["OrgID"].ToString(), node); //再次递归
}
}
}
2、优化后的代码（加载速度快了太多）
在page_load外面定义一个 DataSet用于存需要加载的全部数据
在page_load的 if(!IsPostBack){ds = index.Fill();AddTree("-1", (TreeNode)null);}//fill方法是我写好的获取DataSet的一个方法，在index类中，我这里直接调用
public void AddTree(string ParentID, TreeNode pNode)
{
if (ds.Tables.Count > 0)
{
DataView dvTree = new DataView(ds.Tables[0]);
//过滤ParentOrgID,得到当前的所有子节点
dvTree.RowFilter = "[IndexParentID] = '" + ParentID + "' and [StatusFlag]='1'";
foreach (DataRowView Row in dvTree)
{
TreeNode node = new TreeNode();
if (pNode == null)
{ //添加根节点
node.Text = Row["IndexName"].ToString();
node.Value = Row["IndexID"].ToString();
TreeView1.Nodes.Add(node);
AddTree(Row["IndexID"].ToString(), node); //再次递归
}
else
{ //添加当前节点的子节点
node.Text = Row["IndexName"].ToString();
node.Value = Row["IndexID"].ToString();
pNode.ChildNodes.Add(node);
AddTree(Row["IndexID"].ToString(), node); //再次递归
}
}
dvTree.Dispose();
ds.Dispose();
}
}