如何实现DataGridView的添加删除修改？

2，在界面上拖入DataGridView控件

3，添加相应的列如图：

4，开始编写后面的代码：

public Main() { InitializeComponent();

InitCountryDt(); InitCityDt(); InitGrid(); }

private void InitCityDt() { string[] citys = { "CN|1|北京", "CN|2|天津", "CN|3|山西", "JP|4|大阪", "JP|5|横滨", "JP|6|名古屋", "JP|7|神户", "US|8|纽约" , "US|9|洛杉矶", "US|10|芝加哥", "US|11|休斯敦", "US|12|费城", "US|13|旧金山"}; CityDt.Columns.Add("cityCode"); CityDt.Columns.Add("cityName"); CityDt.Columns.Add("Pid"); for (int i = 0; i < citys.Length; i++) { var newRow = CityDt.NewRow(); newRow["cityCode"] = citys[i].Split('|')[1]; newRow["cityName"] = citys[i].Split('|')[2]; newRow["Pid"] = citys[i].Split('|')[0]; CityDt.Rows.Add(newRow); } } private void InitCountryDt() { string[] countrys = { "CN|中国", "JP|日本", "US|美国" }; CountryDt.Columns.Add("countryCode"); CountryDt.Columns.Add("countryName"); for (int i = 0; i < countrys.Length; i++) { var newRow = CountryDt.NewRow(); newRow["countryCode"] = countrys[i].Split('|')[0]; newRow["countryName"] = countrys[i].Split('|')[1]; CountryDt.Rows.Add(newRow); }

} private void InitGrid() { var dt = new DataTable(); dt.Columns.Add("Id"); dt.Columns.Add("CountryCode"); dt.Columns.Add("CityCode"); for (int i = 10; i < 20; i++) { var newRow = dt.NewRow(); newRow["Id"] = i.ToString(); dt.Rows.Add(newRow); } dataGridView1.DataSource = dt; }

private void btnAdd_Click(object sender, EventArgs e) { var dt = dataGridView1.DataSource 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); } } }

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); } } }

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