C# 關於treeview的綁定和右鍵菜單添加刪除子節點

最近，使用到了winform的treeview控件，在網上看了好多關於treeview控件使用方法的介紹都不全面。於是我這個菜鳥進行了寫了點東西出來，還請高手不要見笑。自此也就當作是自己學習的一種反省和記錄吧，另外朋友們要是不嫌棄的話可以拿去用。閑話少說，上代碼：

 一 、treeview 控件綁定數據庫的操作

      關於數據庫的綁定，參考了網上高手們寫的demo，別笑話我，哈哈。

    代碼

  

  public void AddTree(int ParentID, TreeNode pNode, TreeView productTypeTree)

              {         

                       string sql = "select category_sn, category_name, parent_sn from st_product_category";      

                          DataTable dt = DBHelper.ta(sql, 1);           

                        TreeNode tn1 = new TreeNode();         

                          DataView dvTree = new DataView(dt);       

                         //過濾ParentID,得到當前的所有子節點       

                      dvTree.RowFilter = "[parent_sn] = " + ParentID;           

                   foreach (DataRowView Row in dvTree)      

                  {           

                      if (pNode == null)        

                       {    //添加根節點

                          tn1.Text = Row["category_name"].ToString();      

                          productTypeTree.Nodes.Add(tn1);         

                          tn1.ExpandAll();                   

                          AddTree(Int32.Parse(Row["category_sn"].ToString()), tn1, productTypeTree);    //再次遞歸    

                       }        

                    else    

                      {   //添加當前節點的子節點     

                         TreeNode tn2 = new TreeNode();  

                         tn2.Text = Row["category_name"].ToString();      

                         pNode.Nodes.Add(tn2);            

                         tn1.ExpandAll();          

                         AddTree(Int32.Parse(Row["category_sn"].ToString()), tn2, productTypeTree);    //再次遞歸

                        }          

                    }        

                   productTypeTree.ExpandAll();   

             }

 

     二、  在為treeview 控件添加右鍵菜單 （添加節點，刪除節點）

               在treeview的節點點擊事件中添加右鍵菜單  （TreeView1_NodeMouseClick）   

             

                     private void TreeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)

                    {        

                               if (e.Button != MouseButtons.Right) return;  

                               if (e.Node.Level == 0) return;        

                                TreeNode currentNode = this.productTypeTree.GetNodeAt(new Point(e.X, e.Y));    

                               ContextMenuStrip cms = new ContextMenuStrip();      

                               if (currentNode != null)   

                                   { 

                                        ToolStripMenuItem editAddproduct = new ToolStripMenuItem("添加兄弟節點");  

                                        ToolStripMenuItem editAddprChildoduct = new ToolStripMenuItem("添加子節點"); 

                                        ToolStripMenuItem editDeleteproduct = new ToolStripMenuItem("刪除節點");      

                                        editAddproduct.Click += new EventHandler(editAddproduct_Click);         

                                        editAddprChildoduct.Click += new EventHandler(editAddChildProduct_Click);       

                                        editDeleteproduct.Click += new EventHandler(editDeleteproduct_Click);          

                                        cms.Items.Add(editAddproduct);    

                                        cms.Items.Add(editAddprChildoduct);   

                                        cms.Items.Add(editDeleteproduct);   

                                        cms.Show(this.productTypeTree, e.X, e.Y);   

                                        this.productTypeTree.SelectedNode = currentNode;   

                                    }

                      }

 

三 實現右鍵菜單的點擊事件

            添加子節點

           void editAddChildProduct_Click(object sender, EventArgs e)
        {
            TreeNode tn = this.productTypeTree.SelectedNode;
            AddChildNode(tn, "新節點");
            this.productTypeTree.ExpandAll();
        }       
        //刪除節點
        void editDeleteproduct_Click(object sender, EventArgs e)
        {
            TreeNode treenode = this.productTypeTree.SelectedNode;
            this.DeleteNode(treenode);
            this.productTypeTree.ExpandAll();
        }
        //  添加兄弟節點
        void editAddproduct_Click(object sender, EventArgs e)
        {           
            TreeNode tn = this.productTypeTree.SelectedNode;
            AddtreeNode(tn, "新節點");
            this.productTypeTree.ExpandAll();
        }       

         //添加兄弟節點
        private void AddtreeNode(TreeNode Node, string NewNodeName)
        {
            TreeNode parentNode = Node.Parent;
            TreeNode newNode = new TreeNode(); newNode.Text = NewNodeName;           
            if (parentNode != null)
            {
                if (!parentNode.Nodes.Contains(newNode))
                {
                    parentNode.Nodes.Add(newNode);
                }
                else return;                
            }
        }
        //添加子節點
        private void AddChildNode(TreeNode tn, string NewChileName)
        {
            TreeNode newChildNode = new TreeNode();
            newChildNode.Text = NewChileName;
            tn.Nodes.Add(newChildNode);
        }

         //刪除節點
        private void DeleteNode(TreeNode treenode)
        {
            if (treenode.Nodes.Count==0)   //如果該節點下沒有子節點直接刪除
            {
                this.productTypeTree.Nodes.Remove(treenode);
            }
            else if (treenode.Nodes.Count>0)//該節點下有節點 提示是否全部刪除該節點的所有內容
            {
                if ((MessageBox.Show("是否刪除該項目下的所有子項？","警告",MessageBoxButtons.OKCancel,MessageBoxIcon.Warning))==DialogResult.OK)
                {
                    this.productTypeTree.Nodes.Remove(treenode);
                }
            }
        }

            

多余的解釋我就不寫了，詳細大家都能夠看得懂。也沒有什么好的算法，還望高手指點迷津。

 

    2013-06-11