private void button1_Click(object sender, EventArgs e) {
if(textBox1.Text == String.Empty) {
MessageBox.Show("Please, fill all fields");
return;
}
try {
var objFirstGroup = Form1.objModel.Groups.OrderBy(c => c.Id).FirstOrDefault();
//if no one nodes in base
if(objFirstGroup == null) {
objFirstGroup = new Group() {
Name = textBox1.Text,
LeftKey = 1,
RightKey = 2,
Level = 0
};
Form1.objModel.Groups.Add(objFirstGroup);
Form1.objModel.SaveChanges();
}
else {
var objParentNode = Form1.objModel.Groups.Where(gr => gr.Id == iNodeId).Single();
//Обновляем ключи существующего дерева, узлы стоящие за родительским узлом:
//UPDATE my_tree SET left_key = left_key + 2, right_ key = right_ key + 2 WHERE left_key > $right_ key
var objResultList = Form1.objModel.Groups.Where(group => group.LeftKey > objParentNode.RightKey).
ToList();
foreach(var gr in objResultList) {
gr.LeftKey += 2;
gr.RightKey += 2;
}
Form1.objModel.SaveChanges();
//Обновляем родительскую ветку:
//UPDATE my_tree SET right_key = right_key + 2 WHERE right_key >= $right_key AND left_key < $right_key
objResultList = Form1.objModel.Groups.Where(group => group.RightKey >= objParentNode.RightKey && group.LeftKey < objParentNode.RightKey).ToList();
foreach(var gr in objResultList) {
gr.RightKey += 2;
}
Form1.objModel.SaveChanges();
//Теперь добавляем новый узел :
//INSERT INTO my_tree SET left_key = $right_key, right_key = $right_key + 1, level = $level + 1[дополнительные параметры]
var objNewNode = new Group() {
Name = textBox1.Text,
LeftKey = objParentNode.RightKey - 2,
RightKey = objParentNode.RightKey - 1,
Level = objParentNode.Level + 1
};
Form1.objModel.Groups.Add(objNewNode);
Form1.objModel.SaveChanges();
}
this.Close();
}
catch(Exception ex) {
MessageBox.Show(ex.Message);
}
}
/// <summary>
/// this method create TreeView from NestedSetsTree
/// </summary>
/// <param name="objLogicNode">node of NestedSetsTree</param>
/// <param name="objVisualNode">node of TreeView</param>
private void CreateTreeView(Group objLogicNode, TreeNode objVisualNode) {
//выборка всех recievers котоыре принадлежат к текущей группе
var objReceiversList = objModel.Receivers.Where(r => r.Group.Id == objLogicNode.Id).ToList();
foreach(var reciever in objReceiversList) {
var objNewTreeNode = new TreeNode() {
Tag = reciever.Id,
Name = reciever.Name,
Text = reciever.Name
};
objVisualNode.Nodes.Add(objNewTreeNode);
}
//выбор подчиненных узлов на первом уровне, т.е на всех непосредсвенных детей родительского узла
//SELECT id, name, level FROM my_tree WHERE left_key >= $left_key AND right_key <= $right_key ORDER BY left_key
var objChildNodesList = objModel.Groups.
Where(gr => gr.LeftKey > objLogicNode.LeftKey && gr.RightKey < objLogicNode.RightKey && gr.Level == objLogicNode.Level + 1).
OrderBy(b => b.LeftKey).
ToList();
//add all childs on one level
foreach(var node in objChildNodesList) {
var objNewTreeNode = new TreeNode() {
Tag = node.Id,
Name = node.Name,
Text = node.Name
};
objVisualNode.Nodes.Add(objNewTreeNode);
CreateTreeView(node, objNewTreeNode);
}
}