Method for datagridview in C to display cell contents using tooltip control

This article illustrates how datagridview in C # uses tooltip controls to display the contents of cells. Share it for your reference, as follows:

The code is as follows:

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.SqlClient;
namespace Exam2
{
  public partial class MainForm : Form
  {
    private int cellColumnIndex = -1;// Column index 
    private int cellRowIndex = -1;// Row index 
    public MainForm()
    {
      InitializeComponent();
      // Set the related property values of the prompt tool 
      this.dgvUserInfo.ShowCellToolTips = false;
      this.toolTip.AutomaticDelay = 0;
      this.toolTip.OwnerDraw = true;
      this.toolTip.ShowAlways = true;
      this.toolTip.ToolTipTitle = " ";
      this.toolTip.UseAnimation = true;
      this.toolTip.UseFading = true;
    }
    /// <summary>
    ///  Display user information 
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void MainForm_Load(object sender, EventArgs e)
    {
      string sql = "select  Users ID=userID, User name =name, User login name =username, User password =userPassword from userInfo";
      SqlConnection conn = DBHelper.GetConnection();
      SqlDataAdapter adapter = new SqlDataAdapter(sql,conn);
      DataSet ds = new DataSet();
      adapter.Fill(ds);
      this.dgvUserInfo.DataSource = ds.Tables[0];
    }
    private void dgvUserInfo_CellMouseLeave(object sender, DataGridViewCellEventArgs e)
    {
      this.toolTip.Hide(this.dgvUserInfo);// Hide prompt tool after mouse moves out of cell 
    }
    private void dgvUserInfo_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
    {
      // Determine the validity of the selected cell 
      if (e.RowIndex < 0 || e.ColumnIndex < 0)
      {
        return;
      }
      this.toolTip.Hide(this.dgvUserInfo);
      this.cellColumnIndex = e.ColumnIndex;// Get Column Index 
      this.cellRowIndex = e.RowIndex;// Get Row Index 
      if (this.cellColumnIndex >= 0 && this.cellRowIndex >= 0)
      {
        Point mousePos = PointToClient(MousePosition);// Gets the current position of the mouse 
        // Gets the value in the cell where the mouse moves 
        string tip = this.dgvUserInfo[this.cellColumnIndex, this.cellRowIndex].Value.ToString();
        this.toolTip.Show(tip, this.dgvUserInfo, mousePos);// Displays the prompt tool at the specified location 
      }
    }
    // Drawing prompt tool 
    private void toolTip_Draw(object sender, DrawToolTipEventArgs e)
    {
      e.Graphics.FillRectangle(Brushes.AliceBlue, e.Bounds);
      e.Graphics.DrawRectangle(Pens.Chocolate, new Rectangle(0, 0, e.Bounds.Width - 1, e.Bounds.Height - 1));
      e.Graphics.DrawString(this.toolTip.ToolTipTitle + e.ToolTipText, e.Font, Brushes.Red, e.Bounds);
    }
  }
}

For more readers interested in C # related content, please check out the topics on this site: "C # Common Control Usage Tutorial", "WinForm Control Usage Summary", "C # Data Structure and Algorithm Tutorial", "C # Object-Oriented Programming Introduction Tutorial" and "C # Programming Thread Use Skills Summary"

I hope this article is helpful to everyone's C # programming.