今天，主要弄了一下对于树型控件的一些方法，以及异步加载。
参考：
下面是TreeView的一些用法
private void BindTreeView()
{
treeView1.LabelEdit = false;//不可编辑
//添加结点
TreeNode root = new TreeNode();
root.Text = "根节点";
//一级
TreeNode node1 = new TreeNode();
node1.Text = "";
TreeNode node2 = new TreeNode();
node2.Text = "";
//二级
TreeNode node11 = new TreeNode();
node11.Text = "";
TreeNode node12 = new TreeNode();
node12.Text = "";
TreeNode node21 = new TreeNode();
node21.Text = "";
TreeNode node22 = new TreeNode();
node22.Text = "";
//二级加入一级
node1.Nodes.Add(node11);
node1.Nodes.Add(node12);
node2.Nodes.Add(node21);
node2.Nodes.Add(node22);
//一级加入根
root.Nodes.Add(node1);
root.Nodes.Add(node2);
//
treeView1.Nodes.Add(root);
}
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
if (treeView1.SelectedNode != null)
{
MessageBox.Show(treeView1.SelectedNode.Text);
}
}
基本用法有了，下面，就把我写的异步加载列表的方法写进去了，因为是参考网上的方法临时 写的，可能会有些不足之处，也有可以改进，优化的一些方法
DataTable dt = data.createDT();
#region 树的异步加载
/// <summary>
/// 载入根节点
/// </summary>
public void make_rootView()
{ foreach (DataRow row in dt.Select("module_fatherid='M01'"))
{
TreeNode tn = new TreeNode();
string sk=row["module_id"].ToString();
tn.Text = row["module_name"].ToString();
treeView1.Nodes.Add(tn);
DataRow[] row2=(dt.Select("module_fatherid='" + sk + "'"));
if (row2.Count()!=)
{ TreeNode tn1 = new TreeNode();
tn1.Text = "";
tn.Nodes.Add(tn1);
}
}
}
/// <summary>
/// 载入子节点
/// </summary>
/// <param name="node_id"></param>
/// <param name="node"></param>
public void make_view(string node_id,TreeNode node)
{
node.Nodes.Clear();
foreach (DataRow row in dt.Select("module_fatherid='"+node_id+"'"))
{
TreeNode tn = new TreeNode();
string sk = row["module_id"].ToString();
tn.Text = row["module_name"].ToString();
node.Nodes.Add(tn); if ((dt.Select("module_fatherid='" + sk + "'")).Count() != )
{
TreeNode tn1 = new TreeNode();
tn1.Text = "";
tn.Nodes.Add(tn1);
}
}
}
/// <summary>
/// 查找父节点的ID
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void make_NodeView(object sender, TreeViewCancelEventArgs e)
{
TreeNode tn = e.Node;
string node_id = "";
foreach (DataRow row in dt.Select("module_name='" + tn.Text + "'"))
{
node_id = row["module_id"].ToString();
}
make_view(node_id, tn);
}
#endregion private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)
{
make_NodeView(sender, e); }
在刚载入时调用
private void Form1_Load(object sender, EventArgs e)
{ make_rootView(); }
在树型控件的事件treeView1_BeforeExpand调用
private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)
{ make_NodeView(sender, e); }
下面是我的数据源，我是根据下面这个表格的结构来写代码 ，根据结构的不一样，代码 也应做相应的改变
public class data
{
public static DataTable createDT()
{
DataTable dt = new DataTable();
dt.Columns.Add("module_id");
dt.Columns.Add("module_name");
dt.Columns.Add("module_fatherid");
dt.Columns.Add("module_url");
dt.Columns.Add("module_order"); dt.Rows.Add("C1", "全国", "", "", "");
dt.Rows.Add("M01", "广东", "C1", "", ""); dt.Rows.Add("M0101", "深圳", "M01", "", "");
dt.Rows.Add("M010101", "南山区", "M0101", "", "");
dt.Rows.Add("M010102", "罗湖区", "M0101", "", "");
dt.Rows.Add("M010103", "福田区", "M0101", "", "");
dt.Rows.Add("M010104", "宝安区", "M0101", "", "");
dt.Rows.Add("M010105", "龙岗区", "M0101", "", ""); dt.Rows.Add("M01010301", "上梅林", "M010103", "", "");
dt.Rows.Add("M01010302", "下梅林", "M010103", "", "");
dt.Rows.Add("M01010303", "车公庙", "M010103", "", "");
dt.Rows.Add("M01010304", "竹子林", "M010103", "", "");
dt.Rows.Add("M01010305", "八卦岭", "M010103", "", "");
dt.Rows.Add("M01010306", "华强北", "M010103", "", ""); dt.Rows.Add("M0102", "广州", "M01", "", "");
dt.Rows.Add("M010201", "越秀区", "M0102", "", "");
dt.Rows.Add("M010202", "海珠区", "M0102", "", "");
dt.Rows.Add("M010203", "天河区", "M0102", "", "");
dt.Rows.Add("M010204", "白云区", "M0102", "", "");
dt.Rows.Add("M010205", "黄埔区", "M0102", "", "");
dt.Rows.Add("M010206", "荔湾区", "M0102", "", "");
dt.Rows.Add("M010207", "罗岗区", "M0102", "", "");
dt.Rows.Add("M010208", "南沙区", "M0102", "", "");
return dt;
}
}
以上表结构是从网上摘录下来的！！！