如何实现DataGridView的添加删除修改？

1,创建winform窗体应用程序

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：

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

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);
}
}
}

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);
               }
           }
       } 

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