How to implement addition, deletion and modification of DataGridView?

零下一度
Release: 2017-06-24 09:31:03
Original
3751 people have browsed it

1, create a winform form application

2, drag the DataGridView control into the interface

3, add the corresponding columns as shown:

4, start writing the following code:

private DataTable CountryDt = new DataTable();
private DataTable CityDt = new DataTable();

public Main( )
{
InitializeComponent ();

## Initcountrydt ();

InitCitydt ();
Initgrid ();

PriveCitydt ( ; |Yokohama", "JP|6|Nagoya", "JP|7|Kobe", "US|8|New York"

, , , , "US|9|Los Angeles", "US|10|Chicago", "US| 11|Houston", "US|12|Philadelphia", "US|13|San Francisco"};

CityDt.Columns.Add("cityCode");
CityDt.Columns.Add("cityName");
Citydt.columns.add ("PID");
For (int i = 0; I & LT; Citys.length; I ++)
{## var newRow = CityDt.newrow ();
newRow["cityCode"] = cities[i].Split('|')[1];
newRow["cityName"] = cities[i].Split('|')[2];
newRow["Pid"] = cities[i].Split('|')[0];
CityDt.Rows.Add(newRow);
}
}
private void InitCountryDt ()
                                                                                                                          # CountryDt.Columns.Add("countryName");
newRow["countryCode"] = countries[i].Split('|')[0];
            newRow["countryName"] = countries[i].Split('|')[1];
CountryDt.Rows.Add(newRow);
}

}
          private void InitGrid()
          var dt = new DataTable(); Add ("Id");
i++)
                                                                                                                                                                         ;
      }
DataGridView1.datasource = DT;
}

PRIVATE VOID BTNADD_CLICK (Object SENDER, EVENTARGS E)

{#Aar Dt = CE as datatable;


var newRow = dt.NewRow();
newRow["Id"] = dt.Rows.Count + 1;
dt.Rows.Add(newRow);

for (int i = 0; i < dt.Rows.Count; i++)
           {
               var countryCell = new DataGridViewComboBoxCell();
               countryCell.DataSource = CountryDt;
               countryCell.ValueMember = "countryCode";
               countryCell.DisplayMember = "countryName";
               dataGridView1.Rows[i].Cells["countryCode"] = countryCell;
           }
       }

private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
       {
           var dt = this.dataGridView1.DataSource as DataTable;
           if (dataGridView1.Columns[e.ColumnIndex].Name == nameof(CountryCode))
           {
               var countryCode = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
               var drs = CityDt.Select("Pid='" + countryCode + "'");
               var newCityDt = new DataTable();
               newCityDt.Columns.Add("cityCode");
               newCityDt.Columns.Add("cityName");
               newCityDt.Columns.Add("Pid");
               foreach (DataRow row in drs)
               {
                   var newRow = newCityDt.NewRow();
                   newRow["cityCode"] = row["cityCode"];
                   newRow["cityName"] = row["cityName"];
                   newRow["Pid"] = row["Pid"];
                   newCityDt.Rows.Add(newRow);
               }
               var cityCell = new DataGridViewComboBoxCell();

cityCell.DataSource = newCityDt;
               cityCell.DisplayMember = "cityName";
               cityCell.ValueMember = "cityCode";
               dataGridView1.Rows[e.RowIndex].Cells["CityCode"] = cityCell;
           }
       }

private void Main_Load(object sender, EventArgs e)
       {
           var vdt = dataGridView1.DataSource as DataTable;
           for (int i = 0; i < vdt.Rows.Count; i++)
           {
               var cell = new DataGridViewComboBoxCell()
               {
                   DisplayMember = "countryName",
                   ValueMember = "countryCode",
                   DataSource = CountryDt
               };

dataGridView1.Rows[i].Cells["CountryCode"] = cell;
               if (i % 2 == 0)
               {
                   dataGridView1.Rows[i].Cells["CountryCode"].Value = "JP";
                   dataGridView1.Rows[i].Cells["CityCode"].Value = new Random().Next(4, 7);
               }
               //else {
               //    dataGridView1.Rows[i].Cells["CountryCode"].Value = "CN";
               //}
               if (i % 5 == 0)
               {
                   dataGridView1.Rows[i].Cells["CountryCode"].Value = "CN";
                   dataGridView1.Rows[i].Cells["CityCode"].Value = new Random().Next(1, 3);
               }
               if (i % 9 == 0)
               {
                   dataGridView1.Rows[i].Cells["CountryCode"].Value = "US";
                   dataGridView1.Rows[i].Cells["CityCode"].Value = new Random().Next(8, 13);
               }
           }
       }

private void btnRemove_Click(object sender, EventArgs e)
       {

var selected = dataGridView1.SelectedRows;
           var dt = dataGridView1.DataSource as DataTable;
           if (selected.Count > 0)
           {
               for (var i = 0; i < selected.Count; i++)
               {
                   var row = selected[i];
                   dt.Rows.RemoveAt(row.Index);
               }
           }
       } 

The above is the detailed content of How to implement addition, deletion and modification of DataGridView?. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!