学习Winform的控件DataGridView的一般使用

  1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Drawing;
  5 using System.Linq;
  6 using System.Text;
  7 using System.Threading.Tasks;
  8 using System.Windows.Forms;
  9 
 10 namespace WindowsFormsDemo
 11 {
 12     using System.Data;
 13     using System.Data.SqlClient;
 14     using System.Configuration;
 15 
 16     public partial class Form1 : Form
 17     {
 18         private static readonly string connectionstr = ConfigurationManager.ConnectionStrings["hydb"].ConnectionString;
 19 
 20         public Form1()
 21         {
 22             InitializeComponent();
 23         }
 24 
 25         private void Form1_Load(object sender, EventArgs e)
 26         {
 27             // TODO: 这行代码将数据加载到表“huayaDBDataSet.K_City”中。您可以根据需要移动或删除它。
 28             this.k_CityTableAdapter.Fill(this.huayaDBDataSet.K_City);
 29             for (int i = 1; i < 1000; i++)
 30             {
 31                 this.progressBar1.Value = (int)(((i + 1) / 1000.0) * 100);
 32                 Application.DoEvents();
 33             }
 34             BingDataGridview();
 35         }
 36 
 37         private void BingDataGridview()
 38         {
 39             using (SqlConnection conn = new SqlConnection(connectionstr))
 40             {
 41                 conn.Open();
 42                 using (SqlDataAdapter ad = new SqlDataAdapter("select ID,userID,userno ,Optext,Remark from F_OperateLog", conn))
 43                 {
 44                     using (DataSet set = new DataSet())
 45                     {
 46                         ad.Fill(set);
 47                         this.dataGridView1.DataSource = set.Tables[0].DefaultView;//绑定数据
 48                         dataGridView1.MultiSelect = false;//单选
 49                         dataGridView1.Rows[1].Selected=true;//默认第二行为选中的状态
 50                     }
 51                 }
 52             }
 53         }
 54 
 55         private void btnSubmit_Click(object sender, EventArgs e)
 56         {
 57             string textboxStr = this.texboxStr.Text;
 58             string comboxStr = this.comboBox1.Text;
 59             string radiobtnStr = this.radioButton1.Checked == true ? "男" : "女";
 60             string textChekboxStr = string.IsNullOrEmpty(this.checkBox1.Text) == true ? "" : this.checkBox1.Text;
 61             string textChekboxStr2 = string.IsNullOrEmpty(this.checkBox2.Text) == true ? "" : this.checkBox2.Text;
 62 
 63             string msg = $"textboxStr={textboxStr},comboxStr={comboxStr},radiobtnStr={radiobtnStr},textChekboxStr={ textChekboxStr},textChekboxStr2={textChekboxStr2}";
 64             MessageBox.Show(msg, "结果是：");
 65         }
 66 
 67         private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
 68         {
 69             string id = dataGridView1.CurrentRow.Cells[0].Value.ToString();
 70             if (!string.IsNullOrEmpty(id))
 71             {
 72                 // MessageBox.Show($"获取到主键ID={id}");
 73                 labshowid.Text = $"获取到主键ID={id}";
 74             }
 75         }
 76         /// <summary>
 77         /// 获取选中行的key ID
 78         /// </summary>
 79         /// <param name="sender"></param>
 80         /// <param name="e"></param>
 81         private void btnSelectID_Click(object sender, EventArgs e)
 82         {
 83             string id = dataGridView1.CurrentRow.Cells[0].Value.ToString();
 84             MessageBox.Show($"dataGridView1.CurrentRow.Cells[0].Value.ToString={id},\n下面就可以使用主键ID的值来CURD的操作");
 85         }
 86         /// <summary>
 87         /// 获取选中行的所有数据
 88         /// </summary>
 89         /// <param name="sender"></param>
 90         /// <param name="e"></param>
 91         private void btnSelectRowData_Click(object sender, EventArgs e)
 92         {
 93 
 94             int rowIndex = dataGridView1.CurrentRow.Index;//选中当前行的索引
 95             int cellCount = dataGridView1.GetCellCount(DataGridViewElementStates.Selected);//获取一行的列有多少个
 96 
 97             StringBuilder sb = new StringBuilder();
 98             for (int i = 0; i < cellCount; i++)
 99             {
100                 sb.Append(dataGridView1.CurrentRow.Cells[i].Value.ToString() + ",");
101             }
102             MessageBox.Show(sb.ToString().TrimEnd(‘,‘)+ ",\n\ncellCount=" + cellCount+ ",rowIndex=" + rowIndex);
103         }
104     }
105 }