Datagridview拖放数据到TreeView
通过Datagridview控件可以显示数据库记录
sender:表示支持.net framework类层次结构中所有类的基类对象.
e:表示为mousedown 事件提供数据.
private void treeview1_mouseenter(object sender,eventargs e)
拖放可以选定单行或者多行.
1.选定一条在控件中默认状态下行标题选定.按ctrl 选定记录,放在控件上.
2.选多条记录汇总任意一个端点记录,按shift选中另一端记录.拖放到控件上.
代码如下:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace DateToTreeView
{
public partial class Frm_Main : Form
{
public Frm_Main()
{
InitializeComponent();
}
//声明本程序需要的变量
public static string[,] recordInfo;
//窗体加载时，显示原有的数据
private void Form1_Load(object sender,EventArgs e)
{
string P_Connection = string.Format(//创建数据库连接字符串
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=test.mdb;User Id=Admin");
OleDbDataAdapter P_OLeDbDataAdapter = new OleDbDataAdapter(
"select au_id as 用户编号,au_lname as 用户名,phone as 联系电话 from authors",
P_Connection);
DataSet ds = new DataSet();
P_OLeDbDataAdapter.Fill(ds,"UserInfo");
dataGridView1.DataSource = ds.Tables["UserInfo"].DefaultView;
TreeNode treeNode = new TreeNode("用户信息",0,0);
treeView1.Nodes.Add(treeNode);
//默认情况下追加节点
追加节点ToolStripMenuItem.Checked = true;
}
//DataGridView的按下鼠标事件
private void dataGridView1_MouseDown(object sender,MouseEventArgs e)
{
if(dataGridView1.SelectedCells.Count != 0)
{
//定义一个二维数组，数组中的每一行代表DataGridView中的一条记录
recordInfo = new string[dataGridView1.Rows.Count,dataGridView1.Columns.Count];
//当按下鼠标左键时，首先获取选定行，记录每一行对应的信息
for(int i = 0; i < dataGridView1.Rows.Count; i++)
{
if(dataGridView1.Rows[i].Selected)
{
for(int j = 0; j < dataGridView1.Columns.Count; j++)
{
recordInfo[i,j] = dataGridView1.Rows[i].Cells[j].Value.ToString();
}
}
}
}
}
//当鼠标进入TreeView控件时，触发的操作
private void treeView1_MouseEnter(object sender,EventArgs e)
{
if(追加节点ToolStripMenuItem.Checked == true)
{
#region 代码区域
if(recordInfo != null && recordInfo.Length != 0)
{
//用双重for循环遍历数组recordInfo中的内容
for(int i = 0; i < recordInfo.GetLength(0); i++)
{
for(int j = 0; j < recordInfo.GetLength(1); j++)
{
//判断数组中的值是否为空
if(recordInfo[i,j] != null)
{
if(j == 0)
{
//向TreeView中加入节点
TreeNode Node1 = new TreeNode(recordInfo[i,j].ToString());
treeView1.SelectedNode.Nodes.Add(Node1);
treeView1.SelectedNode = Node1;
}
else
{
//添加子级节点下的子节点
TreeNode Node2 = new TreeNode(recordInfo[i,j].ToString());
treeView1.SelectedNode.Nodes.Add(Node2);
}
}
}
treeView1.SelectedNode = treeView1.Nodes[0];
treeView1.ExpandAll();
}
//清空recordInfo中的记录
for(int m = 0; m < recordInfo.GetLength(0); m++)
{
for(int n = 0; n < recordInfo.GetLength(1); n++)
{
recordInfo[m,n] = null;
}
}
}
#endregion
}
if(清空内容ToolStripMenuItem.Checked == true)
{
if(treeView1.SelectedNode.Nodes.Count != 0)
{
treeView1.SelectedNode.Remove();
TreeNode treeNode = new TreeNode("用户信息",0,0);
treeView1.Nodes.Add(treeNode);
treeView1.SelectedNode = treeNode;
#region 代码区域
if(recordInfo != null && recordInfo.Length != 0)
{
//用双重for循环遍历数组recordInfo中的内容
for(int i = 0; i < recordInfo.GetLength(0); i++)
{
for(int j = 0; j < recordInfo.GetLength(1); j++)
{
//判断数组中的值是否为空
if(recordInfo[i,j] != null)
{
if(j == 0)
{
//向TreeView中加入节点
TreeNode Node1 = new TreeNode(recordInfo[i,j].ToString());
treeView1.SelectedNode.Nodes.Add(Node1);
treeView1.SelectedNode = Node1;
}
else
{
//添加子级节点下的子节点
TreeNode Node2 = new TreeNode(recordInfo[i,j].ToString());
treeView1.SelectedNode.Nodes.Add(Node2);
}
}
}
treeView1.SelectedNode = treeView1.Nodes[0];
treeView1.ExpandAll();
}
//清空recordInfo中的记录
for(int m = 0; m < recordInfo.GetLength(0); m++)
{
for(int n = 0; n < recordInfo.GetLength(1); n++)
{
recordInfo[m,n] = null;
}
}
}
#endregion
追加节点ToolStripMenuItem.Checked = true;
清空内容ToolStripMenuItem.Checked = false;
}
}
}
#region 默认项的设置 codego.net/tags/1/1/
private void 清空内容ToolStripMenuItem_Click(object sender,EventArgs e)
{
if(追加节点ToolStripMenuItem.Checked == true)
{
清空内容ToolStripMenuItem.Checked = true;
追加节点ToolStripMenuItem.Checked = false;
}
}
private void 追加节点ToolStripMenuItem_Click(object sender,EventArgs e)
{
if(清空内容ToolStripMenuItem.Checked == true)
{
追加节点ToolStripMenuItem.Checked = true;
清空内容ToolStripMenuItem.Checked = false;
}
}
#endregion
}
}